From mboxrd@z Thu Jan  1 00:00:00 1970
Message-ID: <9ab217670704170822s6e9649f2u7694a994498d7c6b@mail.gmail.com>
Date: Tue, 17 Apr 2007 11:22:11 -0400
From: "Devon H. O'Dell" <devon.odell@gmail.com>
To: "Fans of the OS Plan 9 from Bell Labs" <9fans@cse.psu.edu>
Subject: Re: [9fans] syscall spikes
In-Reply-To: <5d375e920704170736h1fe36545oc2a95e082fe8e4c9@mail.gmail.com>
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2007/4/17, Uriel <uriel99@gmail.com>:
> fossil

I attempted to tprof fossil and I don't get any useful output. I even did:

for (i in `{ps a | grep fossil | awk '{ print $2 }'})
    echo profile > /proc/$i/ctl

[wait a while for spike]

for (i in `{ps a | grep fossil | awk '{ print $2 }'}) {
    echo $i
    tprof $i
}

All I get is a bunch of lines saying ``total: 0''.

What'm I missing? :(

--dho

> On 4/17/07, Devon H. O'Dell <devon.odell@gmail.com> wrote:
> > Hi,
> >
> > I've been having syscall spikes. It's really weird. There will be
> > >40,000 in 1 second, (according to stats(8)) and it appears at a
> > fairly regular interval. I've tried running kprof, but I'm not sure
> > that it's running a global profile. Namely, when I come out of it, I
> > have tons of time spent in ``halt'', with very, very few (<100)
> > syscalls. Any ideas what I can do to find the culprit? It's gapping
> > sound playback, which is really annoying.
> >
> > --dho
> >
>