pidstat - Report statistics for Linux tasks.

       Sebastien Godard (sysstat <at> orange.fr)

/proc filesystem must be mounted for the pidstat command to work.

       Although pidstat speaks of kilobytes (kB), megabytes (MB)..., it actually uses kibibytes (kiB), mebibytes
       (MiB)...  A kibibyte is equal to 1024 bytes, and a mebibyte is equal to 1024 kibibytes.

       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 -pALL has been used. Not selecting any tasks is equivalent to specifying
       -pALL 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.

       The pidstat command takes into account the following environment variables:

       S_COLORS
              By default statistics are displayed in color when the output is connected to a terminal.  Use this
              variable to change the settings. Possible values for this variable are never, always or auto  (the
              latter is equivalent to the default settings).
              Please note that the color (being red, yellow, or some other color) used to display a value is not
              indicative of any kind of issue simply because of the color. It only indicates different ranges of
              values.

       S_COLORS_SGR
              Specify  the colors and other attributes used to display statistics on the terminal.  Its value is
              a colon-separated list of  capabilities  that  defaults  to  I=32;22:N=34;1:W=35;1:X=31;1:Z=34;22.
              Supported capabilities are:

              I=     SGR (Select Graphic Rendition) substring for item values like PID, UID or CPU number.

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

              W= (or M=)
                     SGR  substring  for  percentage values in the range from 75% to 90% (or in the range 10% to
                     25% depending on the metric's meaning).

              X= (or H=)
                     SGR substring for percentage values greater than or equal to 90% (or lower than or equal to
                     10% depending on the metric's meaning).

              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.  The timestamp will also be compliant with ISO 8601 format.

pidstat25
              Display  five  reports  of  CPU  statistics  for  every  active  task  in the system at two second
              intervals.

       pidstat-r-p164325
              Display five reports of page faults and memory statistics for PID 1643 at two second intervals.

       pidstat-C"fox|bird"-r-pALL
              Display global page faults and memory statistics for all the processes whose command name includes
              the string "fox" or "bird".

       pidstat-TCHILD-r25
              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.

/proc contains various files with system statistics.

       pidstat - Report statistics for Linux tasks.

-Ccomm
              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.

       --dec={0|1|2}
              Specify the number of decimal places to use (0 to 2, default value is 2).

       -eprogramargs
              Execute program with given arguments args and monitor it with pidstat.  pidstat stops when program
              terminates.

       -Gprocess_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  command  name  doesn't  include  the string
              process_name).

       -H     Display timestamp in seconds since the epoch.

       -h     Display all activities horizontally on a single line, with no average statistics at the end of the
              report. This is intended to make it easier to be parsed by other programs.

       --human
              Print sizes in human readable format (e.g. 1.0k, 1.2M, etc.)  The units displayed with this option
              supersede any other default units (e.g.  kilobytes, sectors...) associated with the metrics.

       -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  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 monitored.

              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.

              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).

              %wait  Percentage of CPU spent by the task while waiting to run.

              %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.  An 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.

sar(1), top(1), ps(1), mpstat(1), iostat(1), vmstat(8)

       https://github.com/sysstat/sysstathttps://sysstat.github.io/

Linux                                              AUGUST 2023                                        PIDSTAT(1)

pidstat[-d][-H][-h][-I][-l][-R][-r][-s][-t][-U[username]][-u][-V][-v][-w][-Ccomm][-Gprocess_name][--dec={0|1|2}][--human][-p{pid[,...]|SELF|ALL}][-T{TASK|CHILD|ALL}][interval[count]][-eprogramargs]