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PIDSTAT(1)		      Linux User's Manual		    PIDSTAT(1)



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 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 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 can-
		     celled by the task. This may occur when  the  task	 trun-
		     cates  some  dirty pagecache. In this case, some IO which
		     another task has been accounted for will not  be  happen-
		     ing.

	      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  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 are displayed:

	      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 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 chil-
	      dren, the following values are displayed:

	      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 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, refer-
		     enced 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 statis-
	      tics 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	 chil-
	      dren, the following values are displayed:

	      PID
		     The identification number of the task which is being mon-
		     itored together with its children.

	      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 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	 vari-
       able:


       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  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				  AUGUST 2011			    PIDSTAT(1)
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