| From: | Greg Stark <gsstark(at)mit(dot)edu> |
|---|---|
| To: | pgsql-hackers(at)postgresql(dot)org |
| Subject: | Re: Changing the default configuration (was Re: |
| Date: | 2003-02-13 20:47:08 |
| Message-ID: | 87znozkiwj.fsf@stark.dyndns.tv |
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| Lists: | pgsql-advocacy pgsql-hackers pgsql-performance |
> On Wed, 12 Feb 2003, Bruce Momjian wrote:
> >
> > And part of the reason is because some/most BSD's map the page tables
> > into physical RAM (kernel space) rather than use some shared page table
> > mechanism. This is good because it prevents the shared memory from
> > being swapped out (performance disaster).
Well, it'll only be swapped out if it's not being used...
In any case you can use madvise() to try to avoid that, but it doesn't seem
likely to be a problem since they would probably be the most heavily used
pages in postgres.
--
greg
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