Provided by: sysstat_12.6.1-1ubuntu1_amd64 bug

NAME

       sar - Collect, report, or save system activity information.

SYNOPSIS

       sar [ -A ] [ -B ] [ -b ] [ -C ] [ -D ] [ -d ] [ -F [ MOUNT ] ] [ -H ] [ -h ] [ -p ] [ -r [
       ALL ] ] [ -S ] [ -t ] [ -u [ ALL ] ] [ -V ] [ -v ] [ -W ] [ -w ] [ -y ] [ -z ] [ --dec={ 0
       |  1  |  2  }  ]  [  --dev=dev_list  ]  [  --fs=fs_list  ]  [  --help  ]  [  --human  ]  [
       --iface=iface_list ] [ --int=int_list ] [ --pretty ] [ --sadc ] [ -I [ SUM | ALL ] ] [  -P
       {  cpu_list | ALL } ] [ -m { keyword[,...] | ALL } ] [ -n { keyword[,...] | ALL } ] [ -q [
       keyword[,...] | ALL ] ] [ -j { SID | ID | LABEL | PATH | UUID | ... } ] [ -f [ filename  ]
       |  -o [ filename ] | -[0-9]+ ] [ -i interval ] [ -s [ hh:mm[:ss] ] ] [ -e [ hh:mm[:ss] ] ]
       [ interval [ count ] ]

DESCRIPTION

       The sar command writes to standard output the contents  of  selected  cumulative  activity
       counters  in the operating system. The accounting system, based on the values in the count
       and interval parameters, writes information the specified number of times  spaced  at  the
       specified intervals in seconds.  If the interval parameter is set to zero, the sar command
       displays the average statistics for the time since the system was started. If the interval
       parameter   is   specified  without  the  count  parameter,  then  reports  are  generated
       continuously.  The collected data can also be saved  in  the  file  specified  by  the  -o
       filename flag, in addition to being displayed onto the screen. If filename is omitted, sar
       uses the standard system activity daily data file (see below).  By default  all  the  data
       available from the kernel are saved in the data file.

       The sar command extracts and writes to standard output records previously saved in a file.
       This file can be either the one specified by the -f flag  or,  by  default,  the  standard
       system  activity daily data file.  It is also possible to enter -1, -2 etc. as an argument
       to sar to display data of that days ago. For example, -1 will point at the standard system
       activity file of yesterday.

       Standard  system activity daily data files are named saDD or saYYYYMMDD, where YYYY stands
       for the current year, MM for the current month and DD for the current day.  They  are  the
       default  files used by sar only when no filename has been explicitly specified.  When used
       to write data to files (with its option -o), sar will use saYYYYMMDD if option -D has also
       been  specified, else it will use saDD.  When used to display the records previously saved
       in a file, sar will look for the most recent of saDD and saYYYYMMDD, and use it.

       Standard system activity daily data files are located in the /var/log/sysstat directory by
       default.  Yet  it  is  possible  to specify an alternate location for them: If a directory
       (instead of a plain file) is used with options -f or -o then it will be considered as  the
       directory containing the data files.

       Without  the  -P  flag,  the sar command reports system-wide (global among all processors)
       statistics, which are calculated as averages for values expressed as percentages,  and  as
       sums otherwise. If the -P flag is given, the sar command reports activity which relates to
       the specified processor or processors. If  -P  ALL  is  given,  the  sar  command  reports
       statistics  for  each  individual  processor  and  global statistics among all processors.
       Offline processors are not displayed.

       You can select information about specific system activities using  flags.  Not  specifying
       any  flags  selects  only  CPU  activity.   Specifying  the  -A  flag selects all possible
       activities.

       The default version of the sar command (CPU utilization report) might be one of the  first
       facilities the user runs to begin system activity investigation, because it monitors major
       system resources. If CPU utilization is near 100 percent  (user  +  nice  +  system),  the
       workload sampled is CPU-bound.

       If  multiple  samples  and  multiple  reports  are desired, it is convenient to specify an
       output file for the sar command. Run the sar command as a background process.  The  syntax
       for this is:

       sar -o datafile interval count >/dev/null 2>&1 &

       All data are captured in binary form and saved to a file (datafile).  The data can then be
       selectively displayed with the sar command using the -f option. Set the interval and count
       parameters to select count records at interval second intervals. If the count parameter is
       not set, all the records saved in the file will be selected.  Collection of data  in  this
       manner  is  useful  to  characterize system usage over a period of time and determine peak
       usage hours.

       Note: The sar command only reports on local activities.

OPTIONS

       -A     This is equivalent to specifying -bBdFHISvwWy -m ALL -n ALL -q ALL -r ALL  -u  ALL.
              This  option  also  implies  specifying  -I  ALL  -P  ALL  unless these options are
              explicitly set on the command line.

       -B     Report paging statistics.  The following values are displayed:

              pgpgin/s
                     Total number of kilobytes the system paged in from disk per second.

              pgpgout/s
                     Total number of kilobytes the system paged out to disk per second.

              fault/s
                     Number of page faults (major + minor) made by the system per  second.   This
                     is  not  a  count of page faults that generate I/O, because some page faults
                     can be resolved without I/O.

              majflt/s
                     Number of major faults the system has made  per  second,  those  which  have
                     required loading a memory page from disk.

              pgfree/s
                     Number of pages placed on the free list by the system per second.

              pgscank/s
                     Number of pages scanned by the kswapd daemon per second.

              pgscand/s
                     Number of pages scanned directly per second.

              pgsteal/s
                     Number  of  pages  the  system  has  reclaimed  from  cache  (pagecache  and
                     swapcache) per second to satisfy its memory demands.

              %vmeff Calculated as pgsteal / pgscan, this is a metric of the efficiency  of  page
                     reclaim.  If  it  is near 100% then almost every page coming off the tail of
                     the inactive list is being reaped. If it gets too low (e.g. less  than  30%)
                     then  the virtual memory is having some difficulty.  This field is displayed
                     as zero if no pages have been scanned during the interval of time.

       -b     Report I/O and transfer rate statistics. The following values are displayed:

              tps    Total number of transfers per second that were issued to  physical  devices.
                     A transfer is an I/O request to a physical device. Multiple logical requests
                     can be combined into a single I/O request to the device.  A transfer  is  of
                     indeterminate size.

              rtps   Total number of read requests per second issued to physical devices.

              wtps   Total number of write requests per second issued to physical devices.

              dtps   Total number of discard requests per second issued to physical devices.

              bread/s
                     Total amount of data read from the devices in blocks per second.  Blocks are
                     equivalent to sectors and therefore have a size of 512 bytes.

              bwrtn/s
                     Total amount of data written to devices in blocks per second.

              bdscd/s
                     Total amount of data discarded for devices in blocks per second.

       -C     When reading data from a file, tell sar to display comments that have been inserted
              by sadc.

       -D     Use  saYYYYMMDD  instead  of  saDD  as the standard system activity daily data file
              name. This option works only when used in conjunction with option -o to  save  data
              to file.

       -d     Report activity for each block device.  When data are displayed, the device name is
              displayed as it (should) appear in /dev.  sar uses data in /sys  to  determine  the
              device  name  based on its major and minor numbers.  If this name resolution fails,
              sar  will  use  name  mapping  controlled  by   /etc/sysstat/sysstat.ioconf   file.
              Persistent  device  names  can  also  be  printed if option -j is used (see below).
              Statistics for all devices are displayed unless  a  restricted  list  is  specified
              using  option  --dev=  (see  corresponding  option entry).  Note that disk activity
              depends on sadc's options -S DISK and -S  XDISK  to  be  collected.  The  following
              values are displayed:

              tps    Total  number  of transfers per second that were issued to physical devices.
                     A transfer is an I/O request to a physical device. Multiple logical requests
                     can  be  combined into a single I/O request to the device.  A transfer is of
                     indeterminate size.

              rkB/s  Number of kilobytes read from the device per second.

              wkB/s  Number of kilobytes written to the device per second.

              dkB/s  Number of kilobytes discarded for the device per second.

              areq-sz
                     The average size (in kilobytes) of the I/O requests that were issued to  the
                     device.
                     Note:  In  previous  versions,  this  field  was  known  as avgrq-sz and was
                     expressed in sectors.

              aqu-sz The average queue length of the requests that were issued to the device.
                     Note: In previous versions, this field was known as avgqu-sz.

              await  The average time (in milliseconds) for I/O requests issued to the device  to
                     be  served.  This  includes  the time spent by the requests in queue and the
                     time spent servicing them.

              %util  Percentage of elapsed time during which I/O  requests  were  issued  to  the
                     device (bandwidth utilization for the device). Device saturation occurs when
                     this value is close to 100% for devices serving requests serially.  But  for
                     devices  serving  requests in parallel, such as RAID arrays and modern SSDs,
                     this number does not reflect their performance limits.

       --dec={ 0 | 1 | 2 }
              Specify the number of decimal places to use (0 to 2, default value is 2).

       --dev=dev_list
              Specify the block devices  for  which  statistics  are  to  be  displayed  by  sar.
              dev_list is a list of comma-separated device names.

       -e [ hh:mm[:ss] ]
              Set  the ending time of the report. The default ending time is 18:00:00. Hours must
              be given in 24-hour format.  This option can be used when data  are  read  from  or
              written to a file (options -f or -o).

       -F [ MOUNT ]
              Display  statistics  for  currently  mounted  filesystems.  Pseudo-filesystems  are
              ignored. At the end of the  report,  sar  will  display  a  summary  of  all  those
              filesystems.  Use  of the MOUNT parameter keyword indicates that mountpoint will be
              reported instead of filesystem device. Statistics for all filesystems are displayed
              unless  a restricted list is specified using option --fs= (see corresponding option
              entry).  Note that filesystems statistics depend on sadc's option -S  XDISK  to  be
              collected.

              The following values are displayed:

              MBfsfree
                     Total  amount  of free space in megabytes (including space available only to
                     privileged user).

              MBfsused
                     Total amount of space used in megabytes.

              %fsused
                     Percentage of filesystem space used, as seen by a privileged user.

              %ufsused
                     Percentage of filesystem space used, as seen by an unprivileged user.

              Ifree  Total number of free file nodes in filesystem.

              Iused  Total number of file nodes used in filesystem.

              %Iused Percentage of file nodes used in filesystem.

       -f [ filename ]
              Extract records from filename (created by the -o filename flag). The default  value
              of  the filename parameter is the current standard system activity daily data file.
              If filename is a directory instead of a plain file then it  is  considered  as  the
              directory  where  the standard system activity daily data files are located. Option
              -f is exclusive of option -o.

       --fs=fs_list
              Specify the filesystems for which statistics are to be displayed by  sar.   fs_list
              is a list of comma-separated filesystem names or mountpoints.

       -H     Report hugepages utilization statistics.  The following values are displayed:

              kbhugfree
                     Amount of hugepages memory in kilobytes that is not yet allocated.

              kbhugused
                     Amount of hugepages memory in kilobytes that has been allocated.

              %hugused
                     Percentage of total hugepages memory that has been allocated.

              kbhugrsvd
                     Amount of reserved hugepages memory in kilobytes.

              kbhugsurp
                     Amount of surplus hugepages memory in kilobytes.

       -h     This option is equivalent to specifying --pretty --human.

       --help Display a short help message then exit.

       --human
              Print  sizes  in human readable format (e.g. 1.0k, 1.2M, etc.)  The units displayed
              with this option supersede any other default units  (e.g.   kilobytes,  sectors...)
              associated with the metrics.

       -I [ SUM | ALL ]
              Report statistics for interrupts. The values displayed are the number of interrupts
              per second for the given processor or among all processors.  A list  of  interrupts
              can be specified using --int= (see this option). The SUM keyword indicates that the
              total number of interrupts received per second is to be displayed. The ALL  keyword
              indicates  that  statistics  from  all  interrupts  are to be reported (this is the
              default).  Note that interrupts statistics depend on sadc's option  -S  INT  to  be
              collected.

       -i interval
              Select  data records at seconds as close as possible to the number specified by the
              interval parameter.

       --iface=iface_list
              Specify the network interfaces for which statistics are to  be  displayed  by  sar.
              iface_list is a list of comma-separated interface names.

       --int=int_list
              Specify  the  interrupts  names  for  which  statistics are to be displayed by sar.
              int_list  is  a  list  of  comma-separated  values  or  range  of   values   (e.g.,
              0-16,35,40-).

       -j { SID | ID | LABEL | PATH | UUID | ... }
              Display  persistent  device  names.  Use this option in conjunction with option -d.
              Keywords ID, LABEL, etc. specify the type of the persistent  name.  These  keywords
              are not limited, only prerequisite is that directory with required persistent names
              is present in /dev/disk.  Keyword SID tries to get a stable identifier  to  use  as
              the  device  name.  A  stable  identifier  won't change across reboots for the same
              physical device. If it exists, this identifier is  normally  the  WWN  (World  Wide
              Name) of the device, as read from the /dev/disk/by-id directory.

       -m { keyword[,...] | ALL }
              Report  power  management  statistics.  Note that these statistics depend on sadc's
              option -S POWER to be collected.

              Possible keywords are CPU, FAN, FREQ, IN, TEMP and USB.

              With the CPU keyword, statistics about CPU are reported.  The  following  value  is
              displayed:

              MHz    Instantaneous CPU clock frequency in MHz.

              With  the  FAN  keyword,  statistics  about fans speed are reported.  The following
              values are displayed:

              rpm    Fan speed expressed in revolutions per minute.

              drpm   This field is calculated as the difference between current fan  speed  (rpm)
                     and its low limit (fan_min).

              DEVICE Sensor device name.

              With  the  FREQ  keyword,  statistics  about CPU clock frequency are reported.  The
              following value is displayed:

              wghMHz Weighted average CPU clock frequency in MHz.  Note  that  the  cpufreq-stats
                     driver must be compiled in the kernel for this option to work.

              With  the  IN keyword, statistics about voltage inputs are reported.  The following
              values are displayed:

              inV    Voltage input expressed in Volts.

              %in    Relative input value. A value of 100% means that voltage input  has  reached
                     its  high limit (in_max) whereas a value of 0% means that it has reached its
                     low limit (in_min).

              DEVICE Sensor device name.

              With the TEMP keyword, statistics about  devices  temperature  are  reported.   The
              following values are displayed:

              degC   Device temperature expressed in degrees Celsius.

              %temp  Relative  device  temperature.  A  value  of 100% means that temperature has
                     reached its high limit (temp_max).

              DEVICE Sensor device name.

              With the USB keyword, the sar command takes a  snapshot  of  all  the  USB  devices
              currently  plugged  into  the  system. At the end of the report, sar will display a
              summary of all those USB devices.  The following values are displayed:

              BUS    Root hub number of the USB device.

              idvendor
                     Vendor ID number (assigned by USB organization).

              idprod Product ID number (assigned by Manufacturer).

              maxpower
                     Maximum power consumption of the device (expressed in mA).

              manufact
                     Manufacturer name.

              product
                     Product name.

              The ALL keyword is equivalent to specifying all the keywords  above  and  therefore
              all the power management statistics are reported.

       -n { keyword[,...] | ALL }
              Report network statistics.

              Possible  keywords  are  DEV,  EDEV,  FC, ICMP, EICMP, ICMP6, EICMP6, IP, EIP, IP6,
              EIP6, NFS, NFSD, SOCK, SOCK6, SOFT, TCP, ETCP, UDP and UDP6.

              With the DEV keyword, statistics from the network devices are reported.  Statistics
              for  all  network  interfaces  are  displayed unless a restricted list is specified
              using option --iface= (see corresponding option entry).  The following  values  are
              displayed:

              IFACE  Name of the network interface for which statistics are reported.

              rxpck/s
                     Total number of packets received per second.

              txpck/s
                     Total number of packets transmitted per second.

              rxkB/s Total number of kilobytes received per second.

              txkB/s Total number of kilobytes transmitted per second.

              rxcmp/s
                     Number of compressed packets received per second (for cslip etc.).

              txcmp/s
                     Number of compressed packets transmitted per second.

              rxmcst/s
                     Number of multicast packets received per second.

              %ifutil
                     Utilization percentage of the network interface. For half-duplex interfaces,
                     utilization is calculated using the sum of rxkB/s and txkB/s as a percentage
                     of  the  interface  speed. For full-duplex, this is the greater of rxkB/S or
                     txkB/s.

              With the EDEV keyword, statistics on failures (errors) from the network devices are
              reported.   Statistics for all network interfaces are displayed unless a restricted
              list is specified using option --iface=  (see  corresponding  option  entry).   The
              following values are displayed:

              IFACE  Name of the network interface for which statistics are reported.

              rxerr/s
                     Total number of bad packets received per second.

              txerr/s
                     Total number of errors that happened per second while transmitting packets.

              coll/s Number of collisions that happened per second while transmitting packets.

              rxdrop/s
                     Number  of received packets dropped per second because of a lack of space in
                     linux buffers.

              txdrop/s
                     Number of transmitted packets dropped per second because of a lack of  space
                     in linux buffers.

              txcarr/s
                     Number  of  carrier-errors  that  happened  per  second  while  transmitting
                     packets.

              rxfram/s
                     Number of frame alignment  errors  that  happened  per  second  on  received
                     packets.

              rxfifo/s
                     Number of FIFO overrun errors that happened per second on received packets.

              txfifo/s
                     Number  of  FIFO  overrun  errors  that  happened  per second on transmitted
                     packets.

              With the FC keyword, statistics about fibre channel  traffic  are  reported.   Note
              that fibre channel statistics depend on sadc's option -S DISK to be collected.  The
              following values are displayed:

              FCHOST Name of the fibre  channel  host  bus  adapter  (HBA)  interface  for  which
                     statistics are reported.

              fch_rxf/s
                     The total number of frames received per second.

              fch_txf/s
                     The total number of frames transmitted per second.

              fch_rxw/s
                     The total number of transmission words received per second.

              fch_txw/s
                     The total number of transmission words transmitted per second.

              With  the ICMP keyword, statistics about ICMPv4 network traffic are reported.  Note
              that ICMPv4 statistics depend on sadc's  option  -S  SNMP  to  be  collected.   The
              following values are displayed (formal SNMP names between square brackets):

              imsg/s The  total  number  of  ICMP  messages  which the entity received per second
                     [icmpInMsgs].  Note that this counter includes all those counted by ierr/s.

              omsg/s The total number of ICMP messages which this entity attempted  to  send  per
                     second  [icmpOutMsgs].  Note that this counter includes all those counted by
                     oerr/s.

              iech/s The  number  of  ICMP  Echo   (request)   messages   received   per   second
                     [icmpInEchos].

              iechr/s
                     The number of ICMP Echo Reply messages received per second [icmpInEchoReps].

              oech/s The number of ICMP Echo (request) messages sent per second [icmpOutEchos].

              oechr/s
                     The number of ICMP Echo Reply messages sent per second [icmpOutEchoReps].

              itm/s  The  number  of  ICMP  Timestamp  (request)  messages  received  per  second
                     [icmpInTimestamps].

              itmr/s The  number  of  ICMP  Timestamp  Reply   messages   received   per   second
                     [icmpInTimestampReps].

              otm/s  The   number   of   ICMP   Timestamp  (request)  messages  sent  per  second
                     [icmpOutTimestamps].

              otmr/s The  number   of   ICMP   Timestamp   Reply   messages   sent   per   second
                     [icmpOutTimestampReps].

              iadrmk/s
                     The  number  of  ICMP  Address  Mask  Request  messages  received per second
                     [icmpInAddrMasks].

              iadrmkr/s
                     The  number  of  ICMP  Address  Mask  Reply  messages  received  per  second
                     [icmpInAddrMaskReps].

              oadrmk/s
                     The   number   of  ICMP  Address  Mask  Request  messages  sent  per  second
                     [icmpOutAddrMasks].

              oadrmkr/s
                     The  number  of  ICMP  Address  Mask  Reply   messages   sent   per   second
                     [icmpOutAddrMaskReps].

              With  the EICMP keyword, statistics about ICMPv4 error messages are reported.  Note
              that ICMPv4 statistics depend on sadc's  option  -S  SNMP  to  be  collected.   The
              following values are displayed (formal SNMP names between square brackets):

              ierr/s The  number  of  ICMP  messages  per  second  which  the entity received but
                     determined as having ICMP-specific errors (bad ICMP checksums,  bad  length,
                     etc.) [icmpInErrors].

              oerr/s The number of ICMP messages per second which this entity did not send due to
                     problems discovered within ICMP such as a lack of buffers [icmpOutErrors].

              idstunr/s
                     The number of ICMP Destination  Unreachable  messages  received  per  second
                     [icmpInDestUnreachs].

              odstunr/s
                     The  number  of  ICMP  Destination  Unreachable  messages  sent  per  second
                     [icmpOutDestUnreachs].

              itmex/s
                     The  number  of  ICMP   Time   Exceeded   messages   received   per   second
                     [icmpInTimeExcds].

              otmex/s
                     The    number   of   ICMP   Time   Exceeded   messages   sent   per   second
                     [icmpOutTimeExcds].

              iparmpb/s
                     The  number  of  ICMP  Parameter  Problem  messages  received   per   second
                     [icmpInParmProbs].

              oparmpb/s
                     The   number   of   ICMP   Parameter   Problem   messages  sent  per  second
                     [icmpOutParmProbs].

              isrcq/s
                     The  number  of  ICMP   Source   Quench   messages   received   per   second
                     [icmpInSrcQuenchs].

              osrcq/s
                     The    number   of   ICMP   Source   Quench   messages   sent   per   second
                     [icmpOutSrcQuenchs].

              iredir/s
                     The number of ICMP Redirect messages received per second [icmpInRedirects].

              oredir/s
                     The number of ICMP Redirect messages sent per second [icmpOutRedirects].

              With the ICMP6 keyword, statistics about ICMPv6 network traffic are reported.  Note
              that  ICMPv6  statistics  depend  on  sadc's  option  -S IPV6 to be collected.  The
              following values are displayed (formal SNMP names between square brackets):

              imsg6/s
                     The total number of ICMP messages received by the interface per second which
                     includes all those counted by ierr6/s [ipv6IfIcmpInMsgs].

              omsg6/s
                     The total number of ICMP messages which this interface attempted to send per
                     second [ipv6IfIcmpOutMsgs].

              iech6/s
                     The number of ICMP Echo (request) messages received  by  the  interface  per
                     second [ipv6IfIcmpInEchos].

              iechr6/s
                     The  number of ICMP Echo Reply messages received by the interface per second
                     [ipv6IfIcmpInEchoReplies].

              oechr6/s
                     The number of ICMP Echo Reply messages sent  by  the  interface  per  second
                     [ipv6IfIcmpOutEchoReplies].

              igmbq6/s
                     The  number  of  ICMPv6  Group  Membership  Query  messages  received by the
                     interface per second [ipv6IfIcmpInGroupMembQueries].

              igmbr6/s
                     The number of ICMPv6 Group Membership  Response  messages  received  by  the
                     interface per second [ipv6IfIcmpInGroupMembResponses].

              ogmbr6/s
                     The  number  of  ICMPv6  Group  Membership Response messages sent per second
                     [ipv6IfIcmpOutGroupMembResponses].

              igmbrd6/s
                     The number of ICMPv6 Group Membership Reduction  messages  received  by  the
                     interface per second [ipv6IfIcmpInGroupMembReductions].

              ogmbrd6/s
                     The  number  of  ICMPv6  Group Membership Reduction messages sent per second
                     [ipv6IfIcmpOutGroupMembReductions].

              irtsol6/s
                     The number of ICMP Router Solicit messages received  by  the  interface  per
                     second [ipv6IfIcmpInRouterSolicits].

              ortsol6/s
                     The  number  of  ICMP Router Solicitation messages sent by the interface per
                     second [ipv6IfIcmpOutRouterSolicits].

              irtad6/s
                     The number of ICMP Router Advertisement messages received by  the  interface
                     per second [ipv6IfIcmpInRouterAdvertisements].

              inbsol6/s
                     The  number  of ICMP Neighbor Solicit messages received by the interface per
                     second [ipv6IfIcmpInNeighborSolicits].

              onbsol6/s
                     The number of ICMP Neighbor Solicitation messages sent by the interface  per
                     second [ipv6IfIcmpOutNeighborSolicits].

              inbad6/s
                     The number of ICMP Neighbor Advertisement messages received by the interface
                     per second [ipv6IfIcmpInNeighborAdvertisements].

              onbad6/s
                     The number of ICMP Neighbor Advertisement messages sent by the interface per
                     second [ipv6IfIcmpOutNeighborAdvertisements].

              With the EICMP6 keyword, statistics about ICMPv6 error messages are reported.  Note
              that ICMPv6 statistics depend on sadc's  option  -S  IPV6  to  be  collected.   The
              following values are displayed (formal SNMP names between square brackets):

              ierr6/s
                     The  number  of  ICMP  messages  per second which the interface received but
                     determined as having ICMP-specific errors (bad ICMP checksums,  bad  length,
                     etc.)  [ipv6IfIcmpInErrors]

              idtunr6/s
                     The  number  of  ICMP  Destination  Unreachable  messages  received  by  the
                     interface per second [ipv6IfIcmpInDestUnreachs].

              odtunr6/s
                     The number of ICMP Destination Unreachable messages sent  by  the  interface
                     per second [ipv6IfIcmpOutDestUnreachs].

              itmex6/s
                     The  number  of  ICMP  Time  Exceeded messages received by the interface per
                     second [ipv6IfIcmpInTimeExcds].

              otmex6/s
                     The number of ICMP Time Exceeded messages sent by the interface  per  second
                     [ipv6IfIcmpOutTimeExcds].

              iprmpb6/s
                     The  number of ICMP Parameter Problem messages received by the interface per
                     second [ipv6IfIcmpInParmProblems].

              oprmpb6/s
                     The number of ICMP Parameter Problem messages  sent  by  the  interface  per
                     second [ipv6IfIcmpOutParmProblems].

              iredir6/s
                     The  number  of  Redirect  messages  received  by  the  interface per second
                     [ipv6IfIcmpInRedirects].

              oredir6/s
                     The  number  of  Redirect  messages  sent  by  the   interface   by   second
                     [ipv6IfIcmpOutRedirects].

              ipck2b6/s
                     The  number  of  ICMP  Packet Too Big messages received by the interface per
                     second [ipv6IfIcmpInPktTooBigs].

              opck2b6/s
                     The number of ICMP Packet Too Big messages sent by the interface per  second
                     [ipv6IfIcmpOutPktTooBigs].

              With the IP keyword, statistics about IPv4 network traffic are reported.  Note that
              IPv4 statistics depend on sadc's option -S SNMP to  be  collected.   The  following
              values are displayed (formal SNMP names between square brackets):

              irec/s The  total  number  of  input datagrams received from interfaces per second,
                     including those received in error [ipInReceives].

              fwddgm/s
                     The number of input datagrams per second, for  which  this  entity  was  not
                     their final IP destination, as a result of which an attempt was made to find
                     a route to forward them to that final destination [ipForwDatagrams].

              idel/s The total number of input datagrams successfully delivered per second to  IP
                     user-protocols (including ICMP) [ipInDelivers].

              orq/s  The  total  number  of IP datagrams which local IP user-protocols (including
                     ICMP)  supplied  per   second   to   IP   in   requests   for   transmission
                     [ipOutRequests].   Note  that  this  counter  does not include any datagrams
                     counted in fwddgm/s.

              asmrq/s
                     The  number  of  IP  fragments  received  per  second  which  needed  to  be
                     reassembled at this entity [ipReasmReqds].

              asmok/s
                     The   number   of   IP   datagrams   successfully  re-assembled  per  second
                     [ipReasmOKs].

              fragok/s
                     The number of IP datagrams that have been successfully  fragmented  at  this
                     entity per second [ipFragOKs].

              fragcrt/s
                     The number of IP datagram fragments that have been generated per second as a
                     result of fragmentation at this entity [ipFragCreates].

              With the EIP keyword, statistics about IPv4 network errors are reported.  Note that
              IPv4  statistics  depend  on  sadc's option -S SNMP to be collected.  The following
              values are displayed (formal SNMP names between square brackets):

              ihdrerr/s
                     The number of input datagrams discarded per second due to errors in their IP
                     headers,  including  bad  checksums,  version  number mismatch, other format
                     errors, time-to-live exceeded, errors  discovered  in  processing  their  IP
                     options, etc. [ipInHdrErrors]

              iadrerr/s
                     The number of input datagrams discarded per second because the IP address in
                     their IP header's destination field was not a valid address to  be  received
                     at  this  entity.  This count includes invalid addresses (e.g., 0.0.0.0) and
                     addresses of unsupported Classes (e.g., Class E). For entities which are not
                     IP  routers  and  therefore  do not forward datagrams, this counter includes
                     datagrams discarded because the destination address was not a local  address
                     [ipInAddrErrors].

              iukwnpr/s
                     The   number   of  locally-addressed  datagrams  received  successfully  but
                     discarded  per  second  because  of  an  unknown  or  unsupported   protocol
                     [ipInUnknownProtos].

              idisc/s
                     The  number  of  input  IP  datagrams  per second for which no problems were
                     encountered to prevent their continued processing, but which were  discarded
                     (e.g.,  for  lack  of  buffer space) [ipInDiscards].  Note that this counter
                     does not include any datagrams discarded while awaiting re-assembly.

              odisc/s
                     The number of output IP datagrams  per  second  for  which  no  problem  was
                     encountered  to  prevent  their transmission to their destination, but which
                     were discarded (e.g., for lack of buffer space) [ipOutDiscards].  Note  that
                     this counter would include datagrams counted in fwddgm/s if any such packets
                     met this (discretionary) discard criterion.

              onort/s
                     The number of IP datagrams discarded per second because no  route  could  be
                     found to transmit them to their destination [ipOutNoRoutes].  Note that this
                     counter includes any packets counted in fwddgm/s which meet this  'no-route'
                     criterion.   Note that this includes any datagrams which a host cannot route
                     because all of its default routers are down.

              asmf/s The number of failures detected per second by the IP  re-assembly  algorithm
                     (for  whatever  reason:  timed  out, errors, etc) [ipReasmFails].  Note that
                     this is not necessarily  a  count  of  discarded  IP  fragments  since  some
                     algorithms  can  lose  track of the number of fragments by combining them as
                     they are received.

              fragf/s
                     The number of IP datagrams that have been discarded per second because  they
                     needed to be fragmented at this entity but could not be, e.g., because their
                     Don't Fragment flag was set [ipFragFails].

              With the IP6 keyword, statistics about IPv6 network  traffic  are  reported.   Note
              that  IPv6  statistics  depend  on  sadc's  option  -S  IPV6  to be collected.  The
              following values are displayed (formal SNMP names between square brackets):

              irec6/s
                     The total number of input datagrams received  from  interfaces  per  second,
                     including those received in error [ipv6IfStatsInReceives].

              fwddgm6/s
                     The  number  of  output  datagrams per second which this entity received and
                     forwarded to their final destinations [ipv6IfStatsOutForwDatagrams].

              idel6/s
                     The total number of datagrams successfully  delivered  per  second  to  IPv6
                     user-protocols (including ICMP) [ipv6IfStatsInDelivers].

              orq6/s The   total  number  of  IPv6  datagrams  which  local  IPv6  user-protocols
                     (including ICMP) supplied per second to IPv6 in  requests  for  transmission
                     [ipv6IfStatsOutRequests].   Note  that  this  counter  does  not include any
                     datagrams counted in fwddgm6/s.

              asmrq6/s
                     The number of  IPv6  fragments  received  per  second  which  needed  to  be
                     reassembled at this interface [ipv6IfStatsReasmReqds].

              asmok6/s
                     The   number   of   IPv6   datagrams  successfully  reassembled  per  second
                     [ipv6IfStatsReasmOKs].

              imcpck6/s
                     The number of  multicast  packets  received  per  second  by  the  interface
                     [ipv6IfStatsInMcastPkts].

              omcpck6/s
                     The  number  of  multicast  packets  transmitted per second by the interface
                     [ipv6IfStatsOutMcastPkts].

              fragok6/s
                     The number of IPv6 datagrams that have been successfully fragmented at  this
                     output interface per second [ipv6IfStatsOutFragOKs].

              fragcr6/s
                     The  number of output datagram fragments that have been generated per second
                     as   a    result    of    fragmentation    at    this    output    interface
                     [ipv6IfStatsOutFragCreates].

              With  the  EIP6  keyword,  statistics about IPv6 network errors are reported.  Note
              that IPv6 statistics depend  on  sadc's  option  -S  IPV6  to  be  collected.   The
              following values are displayed (formal SNMP names between square brackets):

              ihdrer6/s
                     The  number  of  input datagrams discarded per second due to errors in their
                     IPv6 headers, including version number mismatch, other  format  errors,  hop
                     count  exceeded,  errors  discovered  in processing their IPv6 options, etc.
                     [ipv6IfStatsInHdrErrors]

              iadrer6/s
                     The number of input datagrams discarded per second because the IPv6  address
                     in  their  IPv6  header's  destination  field  was not a valid address to be
                     received at this entity. This count includes invalid addresses  (e.g.,  ::0)
                     and  unsupported  addresses (e.g., addresses with unallocated prefixes). For
                     entities which are not IPv6 routers and therefore do not forward  datagrams,
                     this  counter  includes  datagrams discarded because the destination address
                     was not a local address [ipv6IfStatsInAddrErrors].

              iukwnp6/s
                     The  number  of  locally-addressed  datagrams  received   successfully   but
                     discarded   per  second  because  of  an  unknown  or  unsupported  protocol
                     [ipv6IfStatsInUnknownProtos].

              i2big6/s
                     The number of input datagrams that could not be forwarded per second because
                     their    size    exceeded    the    link    MTU    of   outgoing   interface
                     [ipv6IfStatsInTooBigErrors].

              idisc6/s
                     The number of input IPv6 datagrams per second for  which  no  problems  were
                     encountered  to prevent their continued processing, but which were discarded
                     (e.g., for lack of buffer space)  [ipv6IfStatsInDiscards].  Note  that  this
                     counter does not include any datagrams discarded while awaiting re-assembly.

              odisc6/s
                     The  number  of  output  IPv6  datagrams per second for which no problem was
                     encountered to prevent their transmission to their  destination,  but  which
                     were  discarded  (e.g.,  for lack of buffer space) [ipv6IfStatsOutDiscards].
                     Note that this counter would include datagrams counted in fwddgm6/s  if  any
                     such packets met this (discretionary) discard criterion.

              inort6/s
                     The number of input datagrams discarded per second because no route could be
                     found to transmit them to their destination [ipv6IfStatsInNoRoutes].

              onort6/s
                     The number of locally generated IP datagrams discarded per second because no
                     route  could  be found to transmit them to their destination [unknown formal
                     SNMP name].

              asmf6/s
                     The number of failures detected per second by the IPv6 re-assembly algorithm
                     (for  whatever  reason:  timed  out,  errors, etc.) [ipv6IfStatsReasmFails].
                     Note that this is not necessarily a count of discarded IPv6 fragments  since
                     some  algorithms can lose track of the number of fragments by combining them
                     as they are received.

              fragf6/s
                     The number of IPv6 datagrams that have been  discarded  per  second  because
                     they  needed  to  be  fragmented  at  this output interface but could not be
                     [ipv6IfStatsOutFragFails].

              itrpck6/s
                     The number of input datagrams discarded per second  because  datagram  frame
                     didn't carry enough data [ipv6IfStatsInTruncatedPkts].

              With  the  NFS  keyword,  statistics  about  NFS client activity are reported.  The
              following values are displayed:

              call/s Number of RPC requests made per second.

              retrans/s
                     Number of RPC requests per second, those which needed  to  be  retransmitted
                     (for example because of a server timeout).

              read/s Number of 'read' RPC calls made per second.

              write/s
                     Number of 'write' RPC calls made per second.

              access/s
                     Number of 'access' RPC calls made per second.

              getatt/s
                     Number of 'getattr' RPC calls made per second.

              With  the  NFSD  keyword,  statistics  about NFS server activity are reported.  The
              following values are displayed:

              scall/s
                     Number of RPC requests received per second.

              badcall/s
                     Number of bad RPC requests  received  per  second,  those  whose  processing
                     generated an error.

              packet/s
                     Number of network packets received per second.

              udp/s  Number of UDP packets received per second.

              tcp/s  Number of TCP packets received per second.

              hit/s  Number of reply cache hits per second.

              miss/s Number of reply cache misses per second.

              sread/s
                     Number of 'read' RPC calls received per second.

              swrite/s
                     Number of 'write' RPC calls received per second.

              saccess/s
                     Number of 'access' RPC calls received per second.

              sgetatt/s
                     Number of 'getattr' RPC calls received per second.

              With  the  SOCK  keyword,  statistics  on  sockets in use are reported (IPv4).  The
              following values are displayed:

              totsck Total number of sockets used by the system.

              tcpsck Number of TCP sockets currently in use.

              udpsck Number of UDP sockets currently in use.

              rawsck Number of RAW sockets currently in use.

              ip-frag
                     Number of IP fragments currently in queue.

              tcp-tw Number of TCP sockets in TIME_WAIT state.

              With the SOCK6 keyword, statistics on sockets in use  are  reported  (IPv6).   Note
              that  IPv6  statistics  depend  on  sadc's  option  -S  IPV6  to be collected.  The
              following values are displayed:

              tcp6sck
                     Number of TCPv6 sockets currently in use.

              udp6sck
                     Number of UDPv6 sockets currently in use.

              raw6sck
                     Number of RAWv6 sockets currently in use.

              ip6-frag
                     Number of IPv6 fragments currently in use.

              With the SOFT keyword,  statistics  about  software-based  network  processing  are
              reported.  The following values are displayed:

              total/s
                     The total number of network frames processed per second.

              dropd/s
                     The  total  number of network frames dropped per second because there was no
                     room on the processing queue.

              squeezd/s
                     The number of times the  softirq  handler  function  terminated  per  second
                     because its budget was consumed or the time limit was reached, but more work
                     could have been done.

              rx_rps/s
                     The number of times the CPU has been woken up per second to process  packets
                     via an inter-processor interrupt.

              flw_lim/s
                     The  number  of  times  the  flow  limit  has been reached per second.  Flow
                     limiting is an optional RPS feature that can be used to limit the number  of
                     packets  queued  to the backlog for each flow to a certain amount.  This can
                     help ensure that smaller flows are processed even though much  larger  flows
                     are pushing packets in.

              blg_len
                     The length of the network backlog.

              With  the  TCP  keyword, statistics about TCPv4 network traffic are reported.  Note
              that TCPv4 statistics depend on  sadc's  option  -S  SNMP  to  be  collected.   The
              following values are displayed (formal SNMP names between square brackets):

              active/s
                     The  number  of  times  TCP connections have made a direct transition to the
                     SYN-SENT state from the CLOSED state per second [tcpActiveOpens].

              passive/s
                     The number of times TCP connections have made a  direct  transition  to  the
                     SYN-RCVD state from the LISTEN state per second [tcpPassiveOpens].

              iseg/s The  total  number of segments received per second, including those received
                     in error [tcpInSegs].  This count includes segments  received  on  currently
                     established connections.

              oseg/s The  total  number  of  segments sent per second, including those on current
                     connections  but  excluding  those  containing  only  retransmitted   octets
                     [tcpOutSegs].

              With  the  ETCP  keyword, statistics about TCPv4 network errors are reported.  Note
              that TCPv4 statistics depend on  sadc's  option  -S  SNMP  to  be  collected.   The
              following values are displayed (formal SNMP names between square brackets):

              atmptf/s
                     The number of times per second TCP connections have made a direct transition
                     to the CLOSED state from either the SYN-SENT state or  the  SYN-RCVD  state,
                     plus  the  number  of  times  per  second TCP connections have made a direct
                     transition to the LISTEN state from the SYN-RCVD state [tcpAttemptFails].

              estres/s
                     The number of times per second TCP connections have made a direct transition
                     to  the  CLOSED  state  from  either the ESTABLISHED state or the CLOSE-WAIT
                     state [tcpEstabResets].

              retrans/s
                     The total number of segments retransmitted per second - that is, the  number
                     of  TCP  segments  transmitted containing one or more previously transmitted
                     octets [tcpRetransSegs].

              isegerr/s
                     The total number of segments received in error (e.g., bad TCP checksums) per
                     second [tcpInErrs].

              orsts/s
                     The  number  of  TCP  segments  sent  per  second  containing  the  RST flag
                     [tcpOutRsts].

              With the UDP keyword, statistics about UDPv4 network traffic  are  reported.   Note
              that  UDPv4  statistics  depend  on  sadc's  option  -S  SNMP to be collected.  The
              following values are displayed (formal SNMP names between square brackets):

              idgm/s The total number  of  UDP  datagrams  delivered  per  second  to  UDP  users
                     [udpInDatagrams].

              odgm/s The  total  number  of  UDP  datagrams  sent  per  second  from  this entity
                     [udpOutDatagrams].

              noport/s
                     The total number of received UDP datagrams per second for which there was no
                     application at the destination port [udpNoPorts].

              idgmerr/s
                     The  number of received UDP datagrams per second that could not be delivered
                     for reasons other than the lack of an application at  the  destination  port
                     [udpInErrors].

              With  the  UDP6 keyword, statistics about UDPv6 network traffic are reported.  Note
              that UDPv6 statistics depend on  sadc's  option  -S  IPV6  to  be  collected.   The
              following values are displayed (formal SNMP names between square brackets):

              idgm6/s
                     The  total  number  of  UDP  datagrams  delivered  per  second  to UDP users
                     [udpInDatagrams].

              odgm6/s
                     The total  number  of  UDP  datagrams  sent  per  second  from  this  entity
                     [udpOutDatagrams].

              noport6/s
                     The total number of received UDP datagrams per second for which there was no
                     application at the destination port [udpNoPorts].

              idgmer6/s
                     The number of received UDP datagrams per second that could not be  delivered
                     for  reasons  other  than the lack of an application at the destination port
                     [udpInErrors].

              The ALL keyword is equivalent to specifying all the keywords  above  and  therefore
              all the network activities are reported.

       -o [ filename ]
              Save the readings in the file in binary form. Each reading is in a separate record.
              The default value of the filename parameter is the current standard system activity
              daily  data  file.  If  filename  is a directory instead of a plain file then it is
              considered as the directory where the standard system activity daily data files are
              located.  Option  -o  is  exclusive  of option -f.  All the data available from the
              kernel are saved in the file (in fact, sar calls its data collector sadc  with  the
              option -S ALL.  See sadc(8) manual page).

       -P { cpu_list | ALL }
              Report   per-processor  statistics  for  the  specified  processor  or  processors.
              cpu_list  is  a  list  of  comma-separated  values  or  range  of   values   (e.g.,
              0,2,4-7,12-).   Note  that processor 0 is the first processor, and processor all is
              the global average among  all  processors.   Specifying  the  ALL  keyword  reports
              statistics  for each individual processor, and globally for all processors. Offline
              processors are not displayed.

       -p, --pretty
              Make reports easier to read by a human.  This option may be especially useful  when
              displaying e.g., network interfaces or block devices statistics.

       -q [ keyword[,...] | ALL ]
              Report system load and pressure-stall statistics.

              Possible keywords are CPU, IO, LOAD, MEM and PSI".

              With  the  CPU keyword, CPU pressure statistics are reported.  The following values
              are displayed:

              %scpu-10
                     Percentage of the time that  at  least  some  runnable  tasks  were  delayed
                     because the CPU was unavailable to them, over the last 10 second window.

              %scpu-60
                     Percentage  of  the  time  that  at  least  some runnable tasks were delayed
                     because the CPU was unavailable to them, over the last 60 second window.

              %scpu-300
                     Percentage of the time that  at  least  some  runnable  tasks  were  delayed
                     because the CPU was unavailable to them, over the last 300 second window.

              %scpu  Percentage  of  the  time  that  at  least  some runnable tasks were delayed
                     because the CPU was unavailable to them, over the last time interval.

              With the IO keyword, I/O pressure statistics are reported.   The  following  values
              are displayed:

              %sio-10
                     Percentage  of  the time that at least some tasks lost waiting for I/O, over
                     the last 10 second window.

              %sio-60
                     Percentage of the time that at least some tasks lost waiting for  I/O,  over
                     the last 60 second window.

              %sio-300
                     Percentage  of  the time that at least some tasks lost waiting for I/O, over
                     the last 300 second window.

              %sio   Percentage of the time that at least some tasks lost waiting for  I/O,  over
                     the last time interval.

              %fio-10
                     Percentage  of the time during which all non-idle tasks were stalled waiting
                     for I/O, over the last 10 second window.

              %fio-60
                     Percentage of the time during which all non-idle tasks were stalled  waiting
                     for I/O, over the last 60 second window.

              %fio-300
                     Percentage  of the time during which all non-idle tasks were stalled waiting
                     for I/O, over the last 300 second window.

              %fio   Percentage of the time during which all non-idle tasks were stalled  waiting
                     for I/O, over the last time interval.

              With the LOAD keyword, queue length and load averages statistics are reported.  The
              following values are displayed:

              runq-sz
                     Run queue length (number of tasks running or waiting for run time).

              plist-sz
                     Number of tasks in the task list.

              ldavg-1
                     System load average for the last minute.  The load average is calculated  as
                     the average number of runnable or running tasks (R state), and the number of
                     tasks in uninterruptible sleep (D state) over the specified interval.

              ldavg-5
                     System load average for the past 5 minutes.

              ldavg-15
                     System load average for the past 15 minutes.

              blocked
                     Number of tasks currently blocked, waiting for I/O to complete.

              With the MEM keyword, memory  pressure  statistics  are  reported.   The  following
              values are displayed:

              %smem-10
                     Percentage  of  the  time  during which at least some tasks were waiting for
                     memory resources, over the last 10 second window.

              %smem-60
                     Percentage of the time during which at least some  tasks  were  waiting  for
                     memory resources, over the last 60 second window.

              %smem-300
                     Percentage  of  the  time  during which at least some tasks were waiting for
                     memory resources, over the last 300 second window.

              %smem  Percentage of the time during which at least some  tasks  were  waiting  for
                     memory resources, over the last time interval.

              %fmem-10
                     Percentage  of the time during which all non-idle tasks were stalled waiting
                     for memory resources, over the last 10 second window.

              %fmem-60
                     Percentage of the time during which all non-idle tasks were stalled  waiting
                     for memory resources, over the last 60 second window.

              %fmem-300
                     Percentage  of the time during which all non-idle tasks were stalled waiting
                     for memory resources, over the last 300 second window.

              %fmem  Percentage of the time during which all non-idle tasks were stalled  waiting
                     for memory resources, over the last time interval.

              The  PSI  keyword is equivalent to specifying CPU, IO and MEM keywords together and
              therefore all the pressure-stall statistics are reported.

              The ALL keyword is equivalent to specifying all the keywords  above  and  therefore
              all the statistics are reported.

       -r [ ALL ]
              Report memory utilization statistics. The ALL keyword indicates that all the memory
              fields should be displayed.  The following values may be displayed:

              kbmemfree
                     Amount of free memory available in kilobytes.

              kbavail
                     Estimate of how much memory in  kilobytes  is  available  for  starting  new
                     applications,  without  swapping.   The estimate takes into account that the
                     system needs some page cache to function well, and that not all  reclaimable
                     slab  will  be  reclaimable,  due to items being in use. The impact of those
                     factors will vary from system to system.

              kbmemused
                     Amount of used memory in kilobytes (calculated as total installed  memory  -
                     kbmemfree - kbbuffers - kbcached - kbslab).

              %memused
                     Percentage of used memory.

              kbbuffers
                     Amount of memory used as buffers by the kernel in kilobytes.

              kbcached
                     Amount of memory used to cache data by the kernel in kilobytes.

              kbcommit
                     Amount  of  memory  in  kilobytes  needed  for current workload.  This is an
                     estimate of how much RAM/swap is needed to guarantee that there never is out
                     of memory.

              %commit
                     Percentage  of  memory  needed for current workload in relation to the total
                     amount of memory (RAM+swap). This number may be greater  than  100%  because
                     the kernel usually overcommits memory.

              kbactive
                     Amount  of  active  memory  in  kilobytes  (memory  that  has been used more
                     recently and usually not reclaimed unless absolutely necessary).

              kbinact
                     Amount of inactive memory in kilobytes (memory which has been less  recently
                     used. It is more eligible to be reclaimed for other purposes).

              kbdirty
                     Amount of memory in kilobytes waiting to get written back to the disk.

              kbanonpg
                     Amount  of  non-file  backed  pages  in kilobytes mapped into userspace page
                     tables.

              kbslab Amount of memory in kilobytes used by the kernel to  cache  data  structures
                     for its own use.

              kbkstack
                     Amount of memory in kilobytes used for kernel stack space.

              kbpgtbl
                     Amount of memory in kilobytes dedicated to the lowest level of page tables.

              kbvmused
                     Amount of memory in kilobytes of used virtual address space.

       -S     Report swap space utilization statistics.  The following values are displayed:

              kbswpfree
                     Amount of free swap space in kilobytes.

              kbswpused
                     Amount of used swap space in kilobytes.

              %swpused
                     Percentage of used swap space.

              kbswpcad
                     Amount  of  cached  swap  memory in kilobytes.  This is memory that once was
                     swapped out, is swapped back in but still also  is  in  the  swap  area  (if
                     memory  is  needed  it  doesn't  need  to be swapped out again because it is
                     already in the swap area. This saves I/O).

              %swpcad
                     Percentage of cached swap memory in relation to  the  amount  of  used  swap
                     space.

       -s [ hh:mm[:ss] ]
              Set  the  starting  time  of  the  data, causing the sar command to extract records
              time-tagged at, or following, the time specified.  The  default  starting  time  is
              08:00:00.  Hours must be given in 24-hour format. This option can be used only when
              data are read from a file (option -f).

       --sadc Indicate which data collector is called by sar.  If the data collector is sought in
              PATH then enter "which sadc" to know where it is located.

       -t     When  reading  data  from  a  daily data file, indicate that sar should display the
              timestamps in the original local time  of  the  data  file  creator.  Without  this
              option, the sar command displays the timestamps in the user's locale time.

       -u [ ALL ]
              Report CPU utilization. The ALL keyword indicates that all the CPU fields should be
              displayed.  The report may show the following fields:

              %user  Percentage of CPU utilization that occurred  while  executing  at  the  user
                     level  (application).  Note  that  this  field  includes  time spent running
                     virtual processors.

              %usr   Percentage of CPU utilization that occurred  while  executing  at  the  user
                     level  (application).  Note  that  this  field  does  NOT include time spent
                     running virtual processors.

              %nice  Percentage of CPU utilization that occurred  while  executing  at  the  user
                     level with nice priority.

              %system
                     Percentage  of  CPU  utilization that occurred while executing at the system
                     level (kernel). Note that this field includes time spent servicing  hardware
                     and software interrupts.

              %sys   Percentage  of  CPU  utilization that occurred while executing at the system
                     level (kernel). Note that this field does NOT include time  spent  servicing
                     hardware or software interrupts.

              %iowait
                     Percentage  of  time  that the CPU or CPUs were idle during which the system
                     had an outstanding disk I/O request.

              %steal Percentage of time spent in involuntary wait by  the  virtual  CPU  or  CPUs
                     while the hypervisor was servicing another virtual processor.

              %irq   Percentage of time spent by the CPU or CPUs to service hardware interrupts.

              %soft  Percentage of time spent by the CPU or CPUs to service software interrupts.

              %guest Percentage of time spent by the CPU or CPUs to run a virtual processor.

              %gnice Percentage of time spent by the CPU or CPUs to run a niced guest.

              %idle  Percentage  of  time  that  the CPU or CPUs were idle and the system did not
                     have an outstanding disk I/O request.

       -V     Print version number then exit.

       -v     Report status of inode, file and other kernel tables.   The  following  values  are
              displayed:

              dentunusd
                     Number of unused cache entries in the directory cache.

              file-nr
                     Number of file handles used by the system.

              inode-nr
                     Number of inode handlers used by the system.

              pty-nr Number of pseudo-terminals used by the system.

       -W     Report swapping statistics. The following values are displayed:

              pswpin/s
                     Total number of swap pages the system brought in per second.

              pswpout/s
                     Total number of swap pages the system brought out per second.

       -w     Report  task  creation  and  system  switching  activity.  The following values are
              displayed:

              proc/s Total number of tasks created per second.

              cswch/s
                     Total number of context switches per second.

       -y     Report TTY devices activity. The following values are displayed:

              rcvin/s
                     Number of receive interrupts per second for  current  serial  line.   Serial
                     line number is given in the TTY column.

              xmtin/s
                     Number of transmit interrupts per second for current serial line.

              framerr/s
                     Number of frame errors per second for current serial line.

              prtyerr/s
                     Number of parity errors per second for current serial line.

              brk/s  Number of breaks per second for current serial line.

              ovrun/s
                     Number of overrun errors per second for current serial line.

       -z     Tell  sar to omit output for any devices for which there was no activity during the
              sample period.

ENVIRONMENT

       The sar command takes into account the following environment variables:

       S_COLORS
              By default statistics are displayed in color when the  output  is  connected  to  a
              terminal.   Use  this  variable  to  change  the settings. Possible values for this
              variable are never, always or  auto  (the  latter  is  equivalent  to  the  default
              settings).
              Please note that the color (being red, yellow, or some other color) used to display
              a value is not indicative of any kind of issue simply because of the color. It only
              indicates different ranges of values.

       S_COLORS_SGR
              Specify the colors and other attributes used to display statistics on the terminal.
              Its  value  is  a  colon-separated  list   of   capabilities   that   defaults   to
              C=33;22:H=31;1:I=32;22:M=35;1:N=34;1:R=31;22:Z=34;22.  Supported capabilities are:

              C=     SGR (Select Graphic Rendition) substring for comments inserted in the binary
                     daily data files.

              H=     SGR substring for percentage values greater than or equal to 75%.

              I=     SGR substring  for  item  names  or  values  (eg.  network  interfaces,  CPU
                     number...)

              M=     SGR substring for percentage values in the range from 50% to 75%.

              N=     SGR substring for non-zero statistics values.

              R=     SGR substring for restart messages.

              Z=     SGR substring for zero values.

       S_TIME_DEF_TIME
              If  this  variable  exists  and its value is UTC then sar will save its data in UTC
              time (data will still be displayed in local time).  sar  will  also  use  UTC  time
              instead  of  local  time  to  determine  the current daily data file located in the
              /var/log/sysstat directory. This variable may be  useful  for  servers  with  users
              located across several timezones.

       S_TIME_FORMAT
              If  this  variable  exists  and  its  value  is ISO then the current locale will be
              ignored when printing the date in the report header.  The sar command will use  the
              ISO  8601  format  (YYYY-MM-DD) instead.  The timestamp will also be compliant with
              ISO 8601 format.

EXAMPLES

       sar -u 2 5
              Report CPU utilization for each 2 seconds. 5 lines are displayed.

       sar -I --int=14 -o int14.file 2 10
              Report statistics on IRQ 14 for each 2 seconds. 10 lines are displayed.   Data  are
              stored in a file called int14.file.

       sar -r -n DEV -f /var/log/sysstat/sa16
              Display memory and network statistics saved in daily data file sa16.

       sar -A Display all the statistics saved in current daily data file.

BUGS

       /proc filesystem must be mounted for the sar command to work.

       All  the  statistics  are not necessarily available, depending on the kernel version used.
       sar assumes that you are using at least a 2.6 kernel.

       Although sar speaks of kilobytes (kB),  megabytes  (MB)...,  it  actually  uses  kibibytes
       (kiB),  mebibytes  (MiB)...  A kibibyte is equal to 1024 bytes, and a mebibyte is equal to
       1024 kibibytes.

FILES

       /var/log/sysstat/saDD
       /var/log/sysstat/saYYYYMMDD
              The standard system activity daily data files and  their  default  location.   YYYY
              stands for the current year, MM for the current month and DD for the current day.

       /proc and /sys contain various files with system statistics.

AUTHOR

       Sebastien Godard (sysstat <at> orange.fr)

SEE ALSO

       sadc(8), sa1(8), sa2(8), sadf(1), sysstat(5), pidstat(1), mpstat(1), iostat(1), vmstat(8)

       https://github.com/sysstat/sysstat
       http://pagesperso-orange.fr/sebastien.godard/