| From: | Neil Conway <neilc(at)samurai(dot)com> |
|---|---|
| To: | PostgreSQL <martin(at)portant(dot)com> |
| Cc: | pgsql-performance(at)postgresql(dot)org |
| Subject: | Re: 8.1beta3 performance |
| Date: | 2005-11-01 02:06:15 |
| Message-ID: | 1130810775.8561.20.camel@localhost.localdomain |
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| Thread: | |
| Lists: | pgsql-performance |
On Mon, 2005-31-10 at 17:16 -0600, PostgreSQL wrote:
> We're running 8.1beta3 on one server and are having ridiculous performance
> issues. This is a 2 cpu Opteron box and both processors are staying at 98
> or 99% utilization processing not-that-complex queries. Prior to the
> upgrade, our I/O wait time was about 60% and cpu utilization rarely got very
> high, now I/O wait time is at or near zero.
Have you done anything to verify that this is actually a problem with
8.1, and not some other change that was made as part of the upgrade
process? For example, if ANALYZE hasn't been re-run, that could cause
the plans chosen by the optimizer to be completely different.
-Neil
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