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

NAME
       pidstat - Report statistics for Linux tasks.

SYNOPSIS
       pidstat [ -d ] [ -h ] [ -I ] [ -l ] [ -r ] [ -s ] [ -t ] [ -U [ username ] ] [ -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 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  con-
       junction  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 dis-
	      played:

	      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 kilo-
		     bytes.

	      %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 col-
		     lected during the interval of time.

	      majflt-nr
		     Total number of major faults made by the task and all its children, and col-
		     lected 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  fin-
	      ishes 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  dis-
	      played.

       -u     Report CPU utilization.

	      When  reporting  statistics  for individual tasks, 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 monitored.

	      PID
		     The identification number of the task being monitored.

	      %usr
		     Percentage of CPU used by the task while executing at the user level (appli-
		     cation),  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 (ker-
		     nel).

	      %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 vir-
		     tual 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 val-
	      ues 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 vol-
		     untary  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 sec-
	      ond intervals.

       pidstat -C "fox|bird" -r -p ALL
	      Display global page faults and memory statistics for all the processes  whose  com-
	      mand 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 sta-
	      tistics 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/

Linux					    MARCH 2013				       PIDSTAT(1)
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