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From Greg Ames <>
Subject Re: 2.0.30-dev load spiking [was: upgrade to FreeBSD 4.5-PRERELEASE]
Date Wed, 02 Jan 2002 21:54:16 GMT
Brian Pane wrote:
> Greg Ames wrote:
> >Jeff & I discussed how to troubleshoot this baby.  Some thoughts:
> >* compare trusses and look for abnormalities
> >* scrutinize the error logs
> >* calculate and log how much CPU time each request takes, the thought
> >being that some requests are burning a lot more CPU than they used to.
> >
> >Any other ideas?
> >
> One more thought:  I graphed the CPU utilization from your vmstat
> output, and the spike is mostly sys time, not usr.  So truss/strace
> data may be helpful--especially if truss on that platform can measure
> the time spent in each syscall.

truss doesn't measure time on FreeBSD according to the man page.  But
maybe there are a lot more syscalls in the failing case, so I'll try it.


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