trusty (1) pidstat.1.gz

Provided by: sysstat_10.2.0-1_amd64 bug

NAME

       pidstat - Report statistics for Linux tasks.

SYNOPSIS

       pidstat  [ -d ] [ -h ] [ -I ] [ -l ] [ -r ] [ -s ] [ -t ] [ -U [ username ] ] [ -u ] [ -V ] [ -v ] [ -w ]
       [ -C comm ] [ -p { pid [,...] | SELF | ALL } ] [ -T { TASK | CHILD | ALL } ] [ 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 may be displayed:

              UID
                     The real user identification number of the task being monitored.

              USER
                     The name of the real user owning the task being monitored.

              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 may be displayed:

              UID
                     The real user identification number of the task being monitored.

              USER
                     The name of the real user owning the task being monitored.

              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  may  be
              displayed:

              UID
                     The  real user identification number of the task which is being monitored together with its
                     children.

              USER
                     The name of the real user owning the task  which  is  being  monitored  together  with  its
                     children.

              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 may be displayed:

              UID
                     The real user identification number of the task being monitored.

              USER
                     The name of the real user owning the task being monitored.

              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 { 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.

       -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.

       -U [ username ]
              Display  the  real  user  name  of  the  tasks being monitored instead of the UID.  If username is
              specified, then only tasks belonging to the specified user are displayed.

       -u     Report CPU utilization.

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

              UID
                     The real user identification number of the task being monitored.

              USER
                     The name of the real user owning the task being monitored.

              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  may  be
              displayed:

              UID
                     The  real user identification number of the task which is being monitored together with its
                     children.

              USER
                     The name of the real user owning the task  which  is  being  monitored  together  with  its
                     children.

              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.

       -v     Report values of some kernel tables. The following values may be displayed:

              UID
                     The real user identification number of the task being monitored.

              USER
                     The name of the real user owning the task being monitored.

              PID
                     The identification number of the task being monitored.

              threads
                     Number of threads associated with current task.

              fd-nr
                     Number of file descriptors associated with current task.

              Command
                     The command name of the task.

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

              UID
                     The real user identification number of the task being monitored.

              USER
                     The name of the real user owning the task being monitored.

              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/