Progress on scaling of FreeBSD on 8 CPU systems
rwatson at FreeBSD.org
Sun Feb 25 13:51:34 UTC 2007
On Sun, 25 Feb 2007, Martin Blapp wrote:
>> It would be really great if we could find "workload owners" who would
>> maintain easy-to-run benchmark configurations and also run them regularly
>> on a fixed hardware configuration over a long time publishing results and
>> testing patches. Kris has done this for SQL benchmarks to great effect,
> I'm interested in such a workload test. At my job we run various other
> servers which have a classic virus/antispam environment. And unfortunatly
> clamd behaves not very well on FreeBSD (see mails to freebsd-threads), and
> this happens even on 2-CPU systems.
> I think its not very difficult to make a scripted load test, with
> 2/4/6/8/16/32 scans in parallel, with ULE or BSD scheduler.
As long as it is realistic and reproduceable, it sounds good to me.
> Btw: what is the best method to profile a threaded application to see where
> it spends the most CPU time ?
Try looking at system pmc support -- using system pmcs, you can profile a
variety of factors (including CPU use, cache misses, etc) across the whole
system (kernel and application), so it's a really neat tool.
Robert N M Watson
University of Cambridge
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