| From: | Curt Sampson <cjs(at)cynic(dot)net> |
|---|---|
| To: | Alvar Freude <alvar(at)a-blast(dot)org> |
| Cc: | Markus Wollny <Markus(dot)Wollny(at)computec(dot)de>, <pgsql-general(at)postgresql(dot)org> |
| Subject: | Re: Still problems with memory swapping and server load |
| Date: | 2002-06-27 14:02:57 |
| Message-ID: | Pine.NEB.4.43.0206272301320.6613-100000@angelic.cynic.net |
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| Lists: | pgsql-general |
On Wed, 26 Jun 2002, Alvar Freude wrote:
> > sort_mem = 8192 (16384 or 32768 didn't help either)
>
> Each sort can take up to 8 MB RAM; if you have some queries which needs
> e.g. 3 big sorts and have 30 from this in parallel, this takes ~720 MB RAM.
Not quite. As I mentioned earlier, postgres 7.2 actually allocates
between 2.5 and three times that amount of memory. So in your
example, you'd have 90 * 3 * 8 * 2.5 or more like 5 GB of memory. :-)
cjs
--
Curt Sampson <cjs(at)cynic(dot)net> +81 90 7737 2974 http://www.netbsd.org
Don't you know, in this new Dark Age, we're all light. --XTC
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