| From: | Mark Wong <markw(at)osdl(dot)org> |
|---|---|
| To: | Simon Riggs <simon(at)2ndquadrant(dot)com> |
| Cc: | testperf-general(at)pgfoundry(dot)org, pgsql-hackers(at)postgresql(dot)org |
| Subject: | Re: [Testperf-general] Re: 8.0beta5 results w/ dbt2 |
| Date: | 2004-12-06 17:42:06 |
| Message-ID: | 20041206094206.A19557@osdl.org |
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| Lists: | pgsql-hackers |
On Tue, Nov 30, 2004 at 10:51:42PM +0000, Simon Riggs wrote:
> My suggestion: increase checkpoint_timeout to 600 secs, increase
> bgwriter parameters also, to reduce how frequently it is called, as well
> as increase the number of blocks per cycle.
Ok, here are a series of three tests varying the bgwriter_delay at 1,
50, and 100:
http://www.osdl.org/projects/dbt2dev/results/pgsql/bgwriter_delay/
I also reduced checkpoint_timeout to 600, where it was prevously at
1800 with the results I posted previously. The throughput changes
weren't significant and the oprofile data is more of less the same.
I'll try varying the bgwriter_maxpages next (that's the number of
blocks per cycle, right?)
Mark
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