| From: | Richard Huxton <dev(at)archonet(dot)com> |
|---|---|
| To: | Jack Coates <jack(at)lyris(dot)com>, josh(at)agliodbs(dot)com |
| Cc: | pgsql-performance <pgsql-performance(at)postgresql(dot)org> |
| Subject: | Re: tuning questions |
| Date: | 2003-12-04 23:47:54 |
| Message-ID: | 200312042347.54461.dev@archonet.com |
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| Thread: | |
| Lists: | pgsql-hackers pgsql-performance |
On Thursday 04 December 2003 23:16, Jack Coates wrote:
>
> > > effective_cache_size = 10000
> >
> > This is way the heck too low. it's supposed to be the size of all
> > available RAM; I'd set it to 2GB*65% as a start.
>
> This makes a little bit of difference. I set it to 65% (15869 pages).
That's still only about 127MB (15869 * 8KB).
> Now we have some real disk IO:
> procs memory swap io
> system cpu
> r b w swpd free buff cache si so bi bo in cs us
> sy id
> 0 3 1 2804 10740 40808 1899856 0 0 26624 0 941 4144
According to this your cache is currently 1,899,856 KB which in 8KB blocks is
237,482 - be frugal and say effective_cache_size = 200000 (or even 150000 if
the trace above isn't typical).
--
Richard Huxton
Archonet Ltd
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