| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | Martijn van Oosterhout <kleptog(at)svana(dot)org> |
| Cc: | Simon Riggs <simon(at)2ndquadrant(dot)com>, Vlad <marchenko(at)gmail(dot)com>, pgsql-general(at)postgresql(dot)org |
| Subject: | Re: Starting PostgreSQL 8.0.4 with more memory [FreeBSD |
| Date: | 2005-10-31 14:54:39 |
| Message-ID: | 197.1130770479@sss.pgh.pa.us |
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| Lists: | pgsql-general |
Martijn van Oosterhout <kleptog(at)svana(dot)org> writes:
> There have been tests that demonstrate that you can raise the buffers
> to a certain point which is optimal and after that it just doesn't
> help [1]. They peg optimal size at 5-10% of memory.
> [1] http://archives.postgresql.org/pgsql-performance/2004-10/msg00110.php
Note however that it's reasonable to think that 8.1 may do better than
8.0 did at performing well with large values of shared_buffers,
primarily because we got rid of the StrategyDirtyBufferList overhead:
http://archives.postgresql.org/pgsql-performance/2004-10/msg00112.php
It'd be interesting to repeat the above-mentioned tests with 8.1.
regards, tom lane
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