PID 11 using 400% CPU
bonomi at mail.r-bonomi.com
Thu Jun 30 04:36:52 UTC 2011
> From owner-freebsd-questions at freebsd.org Wed Jun 29 23:07:59 2011
> Date: Thu, 30 Jun 2011 09:37:11 +0530
> From: Manish Jain <invalid.pointer at gmail.com>
> To: freebsd-questions at freebsd.org
> Subject: PID 11 using 400% CPU
> Hello All,
> I have a strange problem with my 8.1 box. After booting, the hard disk
> goes into a full-speed never-ending spin. 'ps waux' always shows pid
> 11 as taking 400% CPU utilization :
> /root # ps -up 11
> USER PID %CPU %MEM VSZ RSS TT STAT STARTED TIME COMMAND
> root 11 400.0 0.0 0 32 ?? RL 7:22PM 166:35.46 [idle]
> I have tried multiple tweaks to resolve this - all to no effect. The
> only thing that seems out of place is that polkitd seems to be
> missing. (I have no idea why this is the case). /etc/rc.conf states
> This happens even in single-user mode, which I used to try to fix any
> filesystem errors with 'fsck -fy' : there were none.
> My system has only 2 partitions : ad8s2a (/) and ad8s2b (swap).
> Any pointers to what might the problem be ? Thanks in advance.
The problem is that you have twin dual-core CPUs or a single 4-core CPU.
The solution is to substitute a single single-core CPU.
This will bring the _system_idle_process_ utilization down to 100% when the
system is _not_ doing anything else.
OR, you can compile the following C program:
int main( int argc, char** argv)
and run, say, 8 copies of it in background. this will reduce the cpu
utilization of PID 11 to roughly 0%.
The fact that the disk is running is absolutely normal.
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