- Report statistics for Linux tasks.

[root@node85 ~]# pidstat 
Linux 2.6.32-573.el6.x86_64 (node85)    01/31/2017      _x86_64_        (1 CPU)
09:57:53 PM       PID    %usr %system  %guest    %CPU   CPU  Command
09:57:53 PM         1    0.00    0.01    0.00    0.01     0  init
09:57:53 PM         6    0.00    0.00    0.00    0.00     0  watchdog/0
09:57:53 PM         7    0.00    0.05    0.00    0.05     0  events/0
09:57:53 PM        16    0.00    0.00    0.00    0.00     0  sync_supers
09:57:53 PM        17    0.00    0.00    0.00    0.00     0  bdi-default
09:57:53 PM        19    0.00    0.00    0.00    0.00     0  kblockd/0
09:57:53 PM        35    0.00    0.01    0.00    0.01     0  khugepaged
09:57:53 PM       230    0.00    0.00    0.00    0.00     0  mpt_poll_0
09:57:53 PM       446    0.00    0.00    0.00    0.00     0  jbd2/sda2-8
09:57:53 PM       468    0.00    0.00    0.00    0.00     0  flush-8:0
09:57:53 PM       541    0.00    0.00    0.00    0.00     0  udevd
09:57:53 PM       756    0.00    0.00    0.00    0.00     0  vmmemctl
09:57:53 PM      1263    0.00    0.00    0.00    0.00     0  auditd
09:57:53 PM      1285    0.00    0.00    0.00    0.00     0  rsyslogd
09:57:53 PM      1404    0.00    0.00    0.00    0.00     0  hald
09:57:53 PM      1553    0.00    0.00    0.00    0.00     0  master
09:57:53 PM      1594    0.00    0.00    0.00    0.00     0  crond
09:57:53 PM      1648    0.00    0.01    0.00    0.01     0  sshd
09:57:53 PM      1650    0.00    0.00    0.00    0.00     0  bash
09:57:53 PM      1814    0.00    0.00    0.00    0.00     0  bash
09:57:53 PM      1981    0.00    0.00    0.00    0.01     0  python

-r     Report page faults and memory utilization.
-u     Report CPU utilization.
-d     Report I/O statistics
-p     pid

[root@node85 ~]# pidstat -r -d -u -p 1981
Linux 2.6.32-573.el6.x86_64 (node85)    01/31/2017      _x86_64_        (1 CPU)

10:00:33 PM       PID    %usr %system  %guest    %CPU   CPU  Command
10:00:33 PM      1981    0.00    0.00    0.00    0.01     0  python
#Virtual Size: The virtual memory usage of entire task in kilobytes.
#Resident Set Size: The non-swapped physical memory used by the task in kilobytes.


10:00:33 PM       PID  minflt/s  majflt/s     VSZ    RSS   %MEM  Command
10:00:33 PM      1981      0.14      0.00  179668   7960   0.79  python

10:00:33 PM       PID   kB_rd/s   kB_wr/s kB_ccwr/s  Command
10:00:33 PM      1981      0.00      0.00      0.00  python
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.