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pidstat


SYNOPSIS

       pidstat  [  -d ] [ -h ] [ -I ] [ -l ] [ -r ] [ -s ] [ -t ] [ -U [ user-
       name ] ] [ -u ] [ -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 activ-
       ities  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 fol-
              lowing 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  moni-
                     tored.

              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.

       -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  dis-
              played  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 moni-
                     tored.

              PID
                     The identification number of the task being monitored.

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

              majflt/s
                     Total number of major faults the task has made  per  sec-
                     ond, 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  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 mon-
                     itored 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  dis-
              played:

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

              USER
                     The name of the real user owning  the  task  being  moni-
                     tored.

              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,  refer-
                     enced 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
                     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 moni-
                     tored.

              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.


              usr-ms
                     Total number of milliseconds spent by the  task  and  all
                     its  children while executing at the user level (applica-
                     tion), with or without nice priority, and collected  dur-
                     ing  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 (ker-
                     nel), 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 pro-
                     cessor).

              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 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 moni-
                     tored.

              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.

       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  dis-
              played.


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/


Linux MARCH 2013 PIDSTAT(1)



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