| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | "Schmidt, Peter" <peter(dot)schmidt(at)prismedia(dot)com> |
| Cc: | "'Bruce Momjian'" <pgman(at)candle(dot)pha(dot)pa(dot)us>, "'Michael Ansley'" <Michael(dot)Ansley(at)intec-telecom-systems(dot)com>, "'pgsql-admin(at)postgresql(dot)org'" <pgsql-admin(at)postgresql(dot)org> |
| Subject: | Re: v7.1b4 bad performance |
| Date: | 2001-02-17 01:49:36 |
| Message-ID: | 23508.982374576@sss.pgh.pa.us |
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| Lists: | pgsql-admin |
BTW, what -B setting were you running the postmaster with? While poking
at this, I was reminded that having adequate buffer space really makes
a considerable difference ... especially under WAL, where it's not
necessary to flush dirty buffers to disk at the end of each transaction.
The default -B 64 is certainly too small to get reasonable performance.
I got roughly twice the tps reading (pgbench -t 1000, with -F) at -B 1024.
regards, tom lane
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