| From: | Jeff Davis <pgsql(at)j-davis(dot)com> |
|---|---|
| To: | "Joshua D(dot) Drake" <jd(at)commandprompt(dot)com> |
| Cc: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Heikki Linnakangas <heikki(at)enterprisedb(dot)com>, Stefan Kaltenbrunner <stefan(at)kaltenbrunner(dot)cc>, Luke Lonergan <llonergan(at)greenplum(dot)com>, Greg Smith <gsmith(at)gregsmith(dot)com>, pgsql-hackers(at)postgresql(dot)org |
| Subject: | Re: 8.3 / 8.2.6 restore comparison |
| Date: | 2008-02-25 19:36:56 |
| Message-ID: | 1203968216.7878.52.camel@dogma.ljc.laika.com |
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| Lists: | pgsql-hackers |
On Sun, 2008-02-24 at 09:47 -0800, Joshua D. Drake wrote:
> A less hacker and more DBA bottleneck will be to limit the number of
> backends being created for restore. We don't really want to have more
> than one backend per CPU, otherwise we just start switching.
Are you sure that it would always be a loss?
If there is any significant I/O latency for a single backend, it seems
like a context switch could be a win for processor utilization. It might
not be a win overall, but at least potentially a win.
Regards,
Jeff Davis
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