| From: | Simon Riggs <simon(at)2ndquadrant(dot)com> |
|---|---|
| To: | Heikki Linnakangas <heikki(at)enterprisedb(dot)com> |
| Cc: | Gregory Stark <stark(at)enterprisedb(dot)com>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: Free Space Map thoughts |
| Date: | 2007-11-09 09:50:00 |
| Message-ID: | 1194601800.4251.394.camel@ebony.site |
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| Lists: | pgsql-hackers |
On Fri, 2007-11-09 at 09:39 +0000, Heikki Linnakangas wrote:
> Simon Riggs wrote:
> > 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.
>
> Well, it's just intuition at this point.
And yours is usually very good, I would be the first to applaud.
--
Simon Riggs
2ndQuadrant http://www.2ndQuadrant.com
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