Provided by: sysstat_10.0.3-1_amd64 bug

NAME

       pidstat - Report statistics for Linux tasks.

SYNOPSIS

       pidstat  [ -C comm ] [ -d ] [ -h ] [ -I ] [ -l ] [ -p { pid [,...] | SELF | ALL } ] [ -r ]
       [ -s ] [ -t ] [ -T { TASK | CHILD | ALL } ] [ -u ] [ -V ] [ -w ] [ interval [ count ] ]

DESCRIPTION

       The pidstat command is used for monitoring individual tasks currently being managed by the
       Linux kernel.  It writes to standard output activities for every task selected with option
       -p or for every task managed by the Linux kernel if option  -p  ALL  has  been  used.  Not
       selecting  any  tasks is equivalent to specifying -p ALL but only active tasks (tasks with
       non-zero statistics values) will appear in the report.

       The pidstat command can also be used for monitoring the child processes of selected tasks.
       Read about option -T below.

       The  interval  parameter  specifies  the amount of time in seconds between each report.  A
       value of 0 (or no parameters at all) indicates that tasks statistics are  to  be  reported
       for  the  time  since  system  startup  (boot).   The  count parameter can be specified in
       conjunction with the interval parameter if this one is not set to zero. The value of count
       determines  the  number  of  reports  generated at interval seconds apart. If the interval
       parameter is specified without the count parameter, the pidstat command generates  reports
       continuously.

       You can select information about specific task activities using flags.  Not specifying any
       flags selects only CPU activity.

OPTIONS

       -C comm
              Display only tasks whose command name includes the string comm.  This string can be
              a regular expression.

       -d     Report  I/O  statistics  (kernels 2.6.20 and later only).  The following values are
              displayed:

              PID
                     The identification number of the task being monitored.

              kB_rd/s
                     Number of kilobytes the task has caused to be read from disk per second.

              kB_wr/s
                     Number of kilobytes the task has caused, or shall cause  to  be  written  to
                     disk per second.

              kB_ccwr/s
                     Number  of  kilobytes  whose writing to disk has been cancelled by the task.
                     This may occur when the task truncates some dirty pagecache. In  this  case,
                     some IO which another task has been accounted for will not be happening.

              Command
                     The command name of the task.

       -h     Display  all  activities horizontally on a single line. This is intended to make it
              easier to be parsed by other programs.

       -I     In an SMP environment, indicate that tasks CPU usage (as displayed by option  -u  )
              should be divided by the total number of processors.

       -l     Display the process command name and all its arguments.

       -p { pid [,...] | SELF | ALL }
              Select  tasks  (processes)  for  which  statistics  are to be reported.  pid is the
              process identification number. The SELF keyword indicates that statistics are to be
              reported  for  the  pidstat  process itself, whereas the ALL keyword indicates that
              statistics are to be reported for all the tasks managed by the system.

       -r     Report page faults and memory utilization.

              When reporting statistics for individual tasks, the following values are displayed:

              PID
                     The identification number of the task being monitored.

              minflt/s
                     Total number of minor faults the task has made per second, those which  have
                     not required loading a memory page from disk.

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

              VSZ
                     Virtual Size: The virtual memory usage of entire task in kilobytes.

              RSS
                     Resident Set Size: The non-swapped physical  memory  used  by  the  task  in
                     kilobytes.

              %MEM
                     The tasks's currently used share of available physical memory.

              Command
                     The command name of the task.

              When  reporting  global  statistics for tasks and all their children, the following
              values are displayed:

              PID
                     The identification number of the task which is being monitored together with
                     its children.

              minflt-nr
                     Total  number  of  minor  faults  made by the task and all its children, and
                     collected during the interval of time.

              majflt-nr
                     Total number of major faults made by the task  and  all  its  children,  and
                     collected during the interval of time.

              Command
                     The  command  name  of  the  task which is being monitored together with its
                     children.

       -s     Report stack utilization.  The following values are displayed:

              PID
                     The identification number of the task being monitored.

              StkSize
                     The amount of memory in kilobytes reserved for the task as  stack,  but  not
                     necessarily used.

              StkRef
                     The amount of memory in kilobytes used as stack, referenced by the task.

              Command
                     The command name of the task.

       -t     Also display statistics for threads associated with selected tasks.

              This option adds the following values to the reports:

              TGID
                     The identification number of the thread group leader.

              TID
                     The identification number of the thread being monitored.

       -T { TASK | CHILD | ALL }
              This  option  specifies  what  has to be monitored by the pidstat command. The TASK
              keyword indicates that statistics are to be reported for individual tasks (this  is
              the  default  option) whereas the CHILD keyword indicates that statistics are to be
              globally reported for the selected tasks and all their children.  The  ALL  keyword
              indicates  that statistics are to be reported for individual tasks and globally for
              the selected tasks and their children.

              Note: Global statistics for tasks and all their children are not available for  all
              options  of pidstat.  Also these statistics are not necessarily relevant to current
              time interval: The statistics of  a  child  process  are  collected  only  when  it
              finishes or it is killed.

       -u     Report CPU utilization.

              When reporting statistics for individual tasks, the following values are displayed:

              PID
                     The identification number of the task being monitored.

              %usr
                     Percentage  of  CPU  used  by  the  task  while  executing at the user level
                     (application), with or without nice priority. Note that this field does  NOT
                     include time spent running a virtual processor.

              %system
                     Percentage  of  CPU  used  by  the  task while executing at the system level
                     (kernel).

              %guest
                     Percentage of CPU spent by the task in virtual machine  (running  a  virtual
                     processor).

              %CPU
                     Total  percentage  of  CPU time used by the task. In an SMP environment, the
                     task's CPU usage will be divided by the total number of CPU's if  option  -I
                     has been entered on the command line.

              CPU
                     Processor number to which the task is attached.

              Command
                     The command name of the task.

              When  reporting  global  statistics for tasks and all their children, the following
              values are displayed:

              PID
                     The identification number of the task which is being monitored together with
                     its children.

              usr-ms
                     Total  number  of  milliseconds spent by the task and all its children while
                     executing at the user level (application), with or  without  nice  priority,
                     and  collected  during  the  interval of time. Note that this field does NOT
                     include time spent running a virtual processor.

              system-ms
                     Total number of milliseconds spent by the task and all  its  children  while
                     executing at the system level (kernel), and collected during the interval of
                     time.

              guest-ms
                     Total number of milliseconds spent by the  task  and  all  its  children  in
                     virtual machine (running a virtual processor).

              Command
                     The  command  name  of  the  task which is being monitored together with its
                     children.

       -V     Print version number then exit.

       -w     Report task switching activity (kernels 2.6.23  and  later  only).   The  following
              values are displayed:

              PID
                     The identification number of the task being monitored.

              cswch/s
                     Total  number  of  voluntary  context  switches the task made per second.  A
                     voluntary context switch occurs when a task blocks  because  it  requires  a
                     resource that is unavailable.

              nvcswch/s
                     Total  number of non voluntary context switches the task made per second.  A
                     involuntary context switch takes place when a task executes for the duration
                     of its time slice and then is forced to relinquish the processor.

              Command
                     The command name of the task.

ENVIRONMENT

       The pidstat command takes into account the following environment variable:

       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 pidstat command will  use
              the ISO 8601 format (YYYY-MM-DD) instead.

EXAMPLES

       pidstat 2 5
              Display  five  reports of CPU statistics for every active task in the system at two
              second intervals.

       pidstat -r -p 1643 2 5
              Display five reports of page faults and memory  statistics  for  PID  1643  at  two
              second intervals.

       pidstat -C "fox|bird" -r -p ALL
              Display  global  page  faults  and  memory  statistics  for all the processes whose
              command name includes the string "fox" or "bird".

       pidstat -T CHILD -r 2 5
              Display five reports of page faults statistics at  two  second  intervals  for  the
              child  processes  of  all  tasks  in the system. Only child processes with non-zero
              statistics values are displayed.

BUGS

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

FILES

       /proc contains various files with system statistics.

AUTHOR

       Sebastien Godard (sysstat <at> orange.fr)

SEE ALSO

       sar(1), top(1), ps(1), mpstat(1), iostat(1), vmstat(8)

       http://pagesperso-orange.fr/sebastien.godard/