Re: wal_synch_method = open_sync safe on RHEL 5.5?

From: Mark Kirkwood <mark(dot)kirkwood(at)catalyst(dot)net(dot)nz>
To: pgsql-performance(at)postgresql(dot)org
Subject: Re: wal_synch_method = open_sync safe on RHEL 5.5?
Date: 2010-06-18 04:19:52
Message-ID: 4C1AF3E8.4030608@catalyst.net.nz
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On 18/06/10 15:29, Greg Smith wrote:
>
> P.S. Be wary of expecting pgbench to give you useful numbers on a
> single run. For the default write-heavy test, I recommend three runs
> of 10 minutes each (-T 600 on recent PostgreSQL versions) before I
> trust any results it gives. You can get useful data from the
> select-only test in only a few seconds, but not the one that writes a
> bunch.
>

Yeah, I did several runs of each, and a couple with -c 128 and -t 100000
to give the setup a good workout (also 2000-2400 tps, nice to see a well
behaved SAN).

Cheers

Mark

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