pidstat

       pidstat  [ -d ] [ -h ] [ -I ] [ -l ] [ -R ] [ -r ] [ -s ] [ -t ] [ -U [
       username ] ] [ -u ] [ -V ] [ -v ] [ -w ] [ -C comm ] [ -G  process_name
       ]  [  -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.

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

              Command
                     The command name of the task.

       -G process_name
              Display  only  processes  whose command name includes the string
              process_name.  This string  can  be  a  regular  expression.  If
              option  -t  is  used  together  with  option -G then the threads
              belonging to that process are also displayed (even if their com-
              mand name doesn't include the string process_name).

       -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 realtime priority and scheduling policy information.  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.

              prio
                     The realtime priority of the task being monitored.

              policy
                     The scheduling policy of the task being monitored.

              Command
                     The command name of the task.

       -r     Report page faults and memory utilization.

                     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 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 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.

                     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
              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.

       -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.


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

              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 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.

ENVIRONMENT
       The pidstat command takes into account the following environment  vari-
       ables:

       S_COLORS
              When  this  variable  is set, display statistics in color on the
              terminal.  Possible values for this variable are  never,  always
              or auto (the latter is the default).

              H=     SGR (Select Graphic Rendition) substring  for  percentage
                     values greater than or equal to 75%.

              I=     SGR  substring  for item values like PID, UID or CPU num-
                     ber.

              M=     SGR substring for percentage values in the range from 50%
                     to 75%.

              N=     SGR  substring  for  non-zero  statistics  values and for
                     tasks names.

              Z=     SGR substring for zero values and for threads names.

       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/
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