From: | Mark Wong <markw(at)osdl(dot)org> |
---|---|
To: | Josh Berkus <josh(at)agliodbs(dot)com> |
Cc: | pgsql-performance(at)postgresql(dot)org, Bjorn Bength <bjorn(dot)bength(at)curalia(dot)se> |
Subject: | Re: different io elevators in linux |
Date: | 2004-10-27 21:40:48 |
Message-ID: | 20041027144048.A11433@osdl.org |
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Lists: | pgsql-performance |
On Mon, Oct 25, 2004 at 10:09:17AM -0700, Josh Berkus wrote:
> Bjorn,
>
> > I haven't read much FAQs but has anyone done some benchmarks with
> > different io schedulers in linux with postgresql?
>
> According to OSDL, using the "deadline" scheduler sometimes results in a
> roughly 5% boost to performance, and sometimes none, depending on the
> application. We use it for all testing, though, just in case.
>
> --Josh
>
Yes, we found with an OLTP type workload, the as scheduler performs
about 5% worse than the deadline scheduler, where in a DSS type
workload there really isn't much difference. The former doing a
mix of reading/writing, where the latter is doing mostly reading.
Mark
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