| From: | Josh Berkus <josh(at)agliodbs(dot)com> |
|---|---|
| To: | pgsql-performance(at)postgresql(dot)org |
| Cc: | Chris Mair <list(at)1006(dot)org>, markir(at)paradise(dot)net(dot)nz, llonergan(at)greenplum(dot)com |
| Subject: | Re: bad performance on Solaris 10 |
| Date: | 2006-04-06 04:32:16 |
| Message-ID: | 200604052132.16434.josh@agliodbs.com |
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| Lists: | pgsql-performance |
Chris,
> Remounting the fs where $PGDATA lives with "forcedirectio"
> (together with logging, that is default) did not help
> (if not harm...) performance.
Not all of PG. JUST pg_xlog. forcedirectio is only a good idea for the xlog.
> Quickly playing around with wal_buffers on Linux and Mac OS X
> I see it influences the performance of my test a bit, maybe in the
> 10-20% range (I'm really doing quick tests, nothing systematic),
> but nowhere near as spectacularly as on Solaris.
>
> I'm happy so far, but I find it very surprising that this single
> parameter has such an impact (only on) Solaris 10.
That *is* interesting. I hadn't tested this previously specifically on
Solaris.
--
Josh Berkus
Aglio Database Solutions
San Francisco
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