Date: Sun, 21 Feb 1999 22:09:32 -0500 From: tcobb@staff.circle.net To: doconnor@gsoft.com.au Cc: stable@FreeBSD.ORG Subject: RE: SMP and libc_r Message-ID: <A0CFA284C004D211B7EE0060082F32A412E275@freya.circle.net>
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> On 22-Feb-99 tcobb@staff.circle.net wrote: > > Should I expect to see performance improvements with SMP > > and a multithreaded app using libc_r? The app in question > No :( > Not yet anyway :) That's what I was afraid of. This awaits kernel-threads, eh? > > is MySQL and doing the sql benchmarks with an SMP (dual pII 350) > > and non-smp kernel for the same box, I see much faster > > times with the non-smp version. > The SMP kernel spends more time in system locks over the > entire kernel which is a bit > annoying. SMP works much better for things like multiple > CPU intensive processes, it > works really badly on multiple IO intensive apps (because > the all wait for the big kernel > lock) I find it strange that it should perform worse than a single CPU kernel on the same tests, though. Correct me if I'm wrong, but, if I throw alot of memory at MySQL and get it to cache the more frequently-accessed tables then I should be able to work around this? -Troy Cobb Circle Net, Inc. http://www.circle.net To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message
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