Re: high system cpu usage, no culprit in top

From: Justin Guerin (jguerin_at_cso.atmel.com)
Date: 04/07/04

  • Next message: Stefan Bellon: "fvwm and post.hook problem" 
    Date: Wed, 07 Apr 2004 15:35:54 -0600
To: debian-user@lists.debian.org

    On Wednesday 07 April 2004 11:58, Brent Miller wrote:
    > Justin Guerin wrote:
    > >My CPU is 100% utilized, but no processes seem to be using the CPU. I
    > > can't seem to figure out what's causing the load. I know that
    > > something is, though, because xscreensaver is running very slow.
    >
    > Some daemons (mysql comes to mind) won't show up under top, but of
    > course continue to use resources. I _think_ this is because of the way
    > they do threading---If you do a top or ps -A you'll only get the parent
    > processes and not the children (who are actually using the cpu.)
    >
    > I remember that there is a command that shows you what processes are
    > running that are not showing up under ps, but I cannot think of it at
    > the moment. You can always compare the PID's from ps -A against
    > /proc/[0-9]* to find the culprit though.
    >
    > HTH,
    > Brent
    Thanks for the input. I wasn't able to decode /proc/[0-9]*/stat to the
    system CPU load, though. I think I would have to check the stime jiffy
    count for all processes, then see who had the largest share, but it's hard
    to do that real-time _and_ compare to top's output so I know I'm doing it
    right.

    In any case, I noticed that X was using a lot of CPU system time, even
    though it had been reniced (manually). So I decided to start there. I
    restarted X, and it hasn't happened since. This is the first time I
    restarted X since I reconfigured it to run a 0 nice, not -10. It seems
    that manually renicing the running application doesn't have the same effect
    as editing the config and restarting.

    I guess there's some use for rebooting your computer ouside of a kernel
    upgrade or a bootloader splash screen change (even though I still haven't
    done that: I only restarted X ;-)

    Justin 

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