Re: Rewriting Free Space Map

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: "Heikki Linnakangas" <heikki(at)enterprisedb(dot)com>
Cc: "PostgreSQL-development" <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: Rewriting Free Space Map
Date: 2008-03-20 20:59:21
Message-ID: 23294.1206046761@sss.pgh.pa.us
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"Heikki Linnakangas" <heikki(at)enterprisedb(dot)com> writes:
> More precisely, on CVS HEAD it takes between 7.1-7.2%. After extending
> BufferTag with one uint32, it takes 7.4-7.5%. So the effect is
> measurable if you try hard enough, but not anything to get worried about.

And if we adopt the allegedly-faster hash_any that's in the patch
queue, the difference should get smaller yet.

regards, tom lane

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