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SubjectRe: [PATCH 00/12] perf lock: New subcommand "perf lock", for analyzing lock statistics
On Sun, Jan 31 2010, Jens Axboe wrote:
> > I tested this on Core i7 965 + 3GB DRAM machine.
> > Test program is mainly "perf bench sched messaging".
> >
> > Could you tell me the detail of your test situation?
>
> I tried to run it on a 64 thread box, on a fio job that was driving 80
> disks. It was just a quick test, but after ~20 seconds it had not even
> gotten started yet, it was still stuck in setting up the jobs and
> traversing sysfs for finding disk stats, etc. I can try something
> lighter to see if it's the cpu count or the tough job that was making it
> spiral into (near) death.

A simple 'perf lock rec ls' exhibits the same symptoms. It's been
running for a minute or so now, no output. Even local network pings take
500-1000ms.

--
Jens Axboe



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