topic Re: Idle process reported as using 5.06% CPU in Operating System - HP-UX

Idle process reported as using 5.06% CPU

Ivan Skytte Jørgensen — Thu, 28 Jul 2005 07:17:14 GMT

HP-UX 11i, PA-RISC, 2 CPUs, fairly new patches.

I have a completely idle process that is reported as using 5.06% CPU by top and other tools. I have verified that the process does absolutely nothing. The problem occurs after putting heavy load on the process and the stopping the load. Then the CPU use for the process is reported as 5.06% even after 24 hours idle. It does not agree with the overall system CPU use either.

Is this a known problem, and is there a workaround?

Re: Idle process reported as using 5.06% CPU

Pete Randall — Thu, 28 Jul 2005 07:20:30 GMT

What tool(s) are you using to measure this?

Pete

Re: Idle process reported as using 5.06% CPU

Steve Steel — Thu, 28 Jul 2005 10:04:35 GMT

Hi

What does this give

1 echo $_
2 user=$1
3 echo $user
4 echo " $(UNIX95= ps -e -o pcpu -o ruser -o sz -o vsz -opid -oppid -otime -otty -o args|head -n1)"
5 UNIX95= ps -e -o pcpu -o ruser -o sz -o vsz -opid -oppid -otime -otty -o args|grep -v %CPU| sort -nr|tail -n +2|head -n 20|grep " "$user

5 line script so run it twice

Give user name as param

Top is very liberal with figures

Steve Steel

Re: Idle process reported as using 5.06% CPU

Ivan Skytte Jørgensen — Tue, 16 Aug 2005 08:30:27 GMT

Sorry for the long delay (other things to do). I don't have the system setup anymore, but will try to recreate the problem when I have a chance.

The tool used for getting the statistics were 'top' from HP-XU porting centre, and a home-grown top (http://i1.dk/download/isjtop/)

The weird percentage comes from the pstat API, specifically pstat_getproc() where 'pst_pctcpu' seems stuck at 5.06%