| From: | Hannu Krosing <hannu(at)krosing(dot)net> |
|---|---|
| To: | Heikki Linnakangas <heikki(at)enterprisedb(dot)com> |
| 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 20:55:18 |
| Message-ID: | 1207774518.6560.4.camel@huvostro |
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| Lists: | pgsql-hackers |
On Wed, 2008-04-09 at 21:09 +0300, Heikki Linnakangas wrote:
> Hannu Krosing wrote:
> > Saving 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".
Hmm, maybe we I should change my design to modify page free info and its
parent together ?
or what is word ? 2 bytes ? 4 bytes ? even 8 bytes ?
------------
Hannu
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