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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.

              iodelay
                     Block I/O delay of the task being monitored, measured  in
                     clock  ticks.  This  metric  includes  the  delays  spent
                     waiting for sync block  I/O  completion  and  for  swapin
                     block I/O completion.

              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/



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