| From: | Mark Kirkwood <markir(at)coretech(dot)co(dot)nz> |
|---|---|
| To: | Simon Riggs <simon(at)2ndquadrant(dot)com> |
| Cc: | Neil Conway <neilc(at)samurai(dot)com>, Mark Wong <markw(at)osdl(dot)org>, pgsql-hackers(at)postgresql(dot)org, testperf-general(at)pgfoundry(dot)org |
| Subject: | Re: [Testperf-general] BufferSync and bgwriter |
| Date: | 2004-12-13 04:39:21 |
| Message-ID: | 41BD1CF9.9060901@coretech.co.nz |
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| Thread: | |
| Lists: | pgsql-hackers |
Simon,
I am seeing a reasonably reproducible performance boost after applying
your patch (I'm not sure if that was one of the main objectives, but it
certainly is nice).
I *was* seeing a noticeable decrease between 7.4.6 and 8.0.0RC1 running
pgbench. However, after applying your patch, 8.0 is pretty much back to
being the same.
Now I know pgbench is ..err... not always the most reliable for this
sort of thing, so I am interested if this seems like a reasonable sort
of thing to be noticing (and also if anyone else has noticed the
decrement)?
(The attached brief results are for Linux x86, but I can see a similar
performance decrement 7.4.6->8.0.0RC1 on FreeBSD 5.3 x86)
regards
Mark
Simon Riggs wrote:
>Hmm...must confess that my only plan is:
>i) discover dynamic behaviour of bgwriter
>ii) fix any bugs or wierdness as quickly as possible
>iii) try to find a way to set the bgwriter defaults
>
>
>
| Attachment | Content-Type | Size |
|---|---|---|
| pgbench.results | text/plain | 922 bytes |
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