Re: Free Space Map data structure

From: Heikki Linnakangas <heikki(at)enterprisedb(dot)com>
To: Hannu Krosing <hannu(at)krosing(dot)net>
Cc: Pavan Deolasee <pavan(dot)deolasee(at)gmail(dot)com>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: Free Space Map data structure
Date: 2008-04-09 18:09:34
Message-ID: 47FD065E.7030704@enterprisedb.com
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Hannu Krosing wrote:
> Sabing 1 byte is an atomic op

Unfortunately, it's not. Most if not all modern CPUs will perform one
byte modification as "load word" + "modify word" + "save word".

--
Heikki Linnakangas
EnterpriseDB http://www.enterprisedb.com

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