| From: | Simon Riggs <simon(at)2ndquadrant(dot)com> |
|---|---|
| To: | Gregory Stark <stark(at)enterprisedb(dot)com> |
| Cc: | Heikki Linnakangas <heikki(at)enterprisedb(dot)com>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: Free Space Map thoughts |
| Date: | 2007-11-09 07:50:40 |
| Message-ID: | 1194594640.4251.333.camel@ebony.site |
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| Thread: | |
| Lists: | pgsql-hackers |
On Thu, 2007-11-08 at 23:04 +0000, Gregory Stark wrote:
> "Simon Riggs" <simon(at)2ndquadrant(dot)com> writes:
>
> > The pages might well be in cache, so the file location might well be
> > irrelevant from an I/O perspective. Maybe. The nth page solution allows
> > the FSM block to be easily located without any FSM index, so might well
> > be faster. Separate files mean more space and more fsyncs too. But even
> > so, I'm not sure either way.
>
> I don't follow any of the logical leaps in this paragraph.
I asked Heikki to explain why he felt the design should go a certain
way, which he didn't do. That's the logical leap I'm worried about.
I repeat: I'm not sure either way.
--
Simon Riggs
2ndQuadrant http://www.2ndQuadrant.com
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