topic schedcpu process in Operating System - HP-UX

schedcpu process

Hisham Shahbaz — Thu, 08 Oct 2009 08:16:58 GMT

I get the following when I run the top command on my server (HP UX 11.23). Can anyone tell me what schedcpu is and what it does?

CPU 0
PID 39
USERNAME root
PRI 152
STATE run
%CPU 0.49
COMMAND schedcpu

Thank you!

Re: schedcpu process

Dennis Handly — Thu, 08 Oct 2009 08:25:36 GMT

Some kernel demon. An old thread that mentions it:
http://forums.itrc.hp.com/service/forums/questionanswer.do?threadId=198314

Re: schedcpu process

Duncan Edmonstone — Thu, 08 Oct 2009 10:37:11 GMT

all you need to know is that (as Dennis said), it's a kernel daemon and you shludn't touch it!

Actually schedcpu is repsonsible for adjusting thread priorities and balancing threads across available run queues (i.e. CPUs/Cores)

HTH

Duncan

Re: schedcpu process

Hakki Aydin Ucar — Thu, 08 Oct 2009 13:48:05 GMT

I believe that it is a process related with adjust thread priority , with its percentage of CPU utility and priority and Process ID.

in detail:
Every 1 second, schedcpu() decrements the kt_cpu value for each thread on the run queue. setpri() is called to calculate a new priority of the current thread being examined in the schedcpu()

to see more detail about this proc:
http://docs.hp.com/en/5965-4642/ch01s15.html