From: Markus Schaber <schabi@logix-tt.com>
To: Luke Lonergan <llonergan@greenplum.com>
Cc: pgsql-performance@postgresql.org
Subject: Re: Large tables (was: RAID 0 not as fast as
Date: Thu, 21 Sep 2006 09:31:12 +0200
Message-ID: <45123FC0.9060100@logix-tt.com> (raw)
In-Reply-To: <C1372993.2361%llonergan@greenplum.com>
References: <C1372993.2361%llonergan@greenplum.com>
Hi, Luke,
Luke Lonergan wrote:
>> I thought that posix_fadvise() with POSIX_FADV_WILLNEED was exactly
>> meant for this purpose?
>
> This is a good idea - I wasn't aware that this was possible.
This possibility was the reason for me to propose it. :-)
> We'll do some testing and see if it works as advertised on Linux and
> Solaris.
Fine, I'm looking forward to the results.
According to my small test, it works at least on linux 2.6.17.4.
Btw, posix_fadvise() could even give a small improvement for
multi-threaded backends, given that the I/O subsystem is smart enough to
cope intelligently to cope with large bunches of outstanding requests.
HTH,
Markus
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To: pgsql-performance@postgresql.org
Cc: schabi@logix-tt.com, llonergan@greenplum.com
Subject: Re: Large tables (was: RAID 0 not as fast as
In-Reply-To: <45123FC0.9060100@logix-tt.com>
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