From: Chris Mair <list@1006.org>
To: Mark Kirkwood <markir@paradise.net.nz>
Cc: pgsql-performance@postgresql.org
Cc: josh@agliodbs.com
Cc: llonergan@greenplum.com
Subject: Re: bad performance on Solaris 10
Date: Thu, 06 Apr 2006 01:29:40 +0200
Message-ID: <1144279780.5133.19.camel@dell.home.lan> (raw)
In-Reply-To: <443451F0.5060605@paradise.net.nz>
References: <1144111178.3723.80.camel@dell.home.lan>
<1144272685.4562.43.camel@dell.home.lan>
<443451F0.5060605@paradise.net.nz>
> > I've done a few tests.
> >
> > Remounting the fs where $PGDATA lives with "forcedirectio"
> > (together with logging, that is default) did not help
> > (if not harm...) performance.
> >
> >
>
> Sure - forcedirectio on the entire $PGDATA is a definite loss, you only
> want it on $PGDATA/pg_xlog. The usual way this is accomplished is by
> making a separate filsystem for pg_xlog and symlinking from $PGDATA.
>
> Did you try the other option of remounting the fs for $PGDATA without
> logging or forcedirectio?
not yet, I'm not on the final disk set yet.
when I get there I'll have two separate filesystems for pg_xlog and base
and will try what you suggest.
(but note the other mail about wal_sync_method = fsync)
bye, chris.
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To: pgsql-performance@postgresql.org
Cc: list@1006.org, markir@paradise.net.nz, josh@agliodbs.com, llonergan@greenplum.com
Subject: Re: bad performance on Solaris 10
In-Reply-To: <1144279780.5133.19.camel@dell.home.lan>
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