View multiple processes for context switching (find which process take the most context switch)

This is the original link http://serverfault.com/questions/190049/find-out-which-task-is-generating-a-lot-of-context-switches-on-linux

The main thing is to use pidstat-w to view context switches,

[email protected]:~# pidstat -w 1linux 4.2.0-16-generic  (Wis-virtual-machine)      April 08, 2016   _i686_   (1 CPU)  10 19 minutes and 27 seconds    UID        pid   cswch/s nvcswch/s  command10 19 minutes, 28 seconds       0         3       3.88      0.00  ksoftirqd/010 19 minutes 28 seconds      0          7     13.59       0.00  rcu_sched10 19 minutes, 28 seconds      0         10      0.97      0.00   watchdog/010 19 minutes 28 seconds      0       833       7.77      0.00  xorg10 19 minutes, 28 seconds   1000       1564      6.80      7.77   compiz

The-t option lets you view the processes under the process.

[Email protected]:~# pidstat-w-T
Linux 4.2.0-16-generic (wis-virtual-machine) April 19, 2016 _i686_ (1 CPU)

08:34 24 sec UID tgid TID cswch/s nvcswch/s Command
08:34 24 sec 0 1-1.63 1.39 systemd
08:34 24 sec 0-1 1.63 1.39 |__systemd
08:34 24 sec 0 2-0.32 0.00 Kthreadd
08:34 24 sec 0-2 0.32 0.00 |__kthreadd
08:34 24 sec 0 3-3.00 0.01 ksoftirqd/0
08:34 24 sec 0-3 3.00 0.01 |__ksoftirqd/0

There is also a watch command when viewing the data, and you can have a man look at it, (watch-tdn0.5 pidstat-w)

View multiple processes for context switching (find which process take the most context switch)