| From: | Dave Cramer <pg(at)fastcrypt(dot)com> |
|---|---|
| To: | Robert Creager <Robert_Creager(at)LogicalChaos(dot)org> |
| Cc: | Josh Berkus <josh(at)agliodbs(dot)com>, Dirk_Lutzebäck <lutzeb(at)aeccom(dot)com>, ohp(at)pyrenet(dot)fr, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Joe Conway <mail(at)joeconway(dot)com>, "scott(dot)marlowe" <scott(dot)marlowe(at)ihs(dot)com>, Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us>, pgsql-performance(at)postgresql(dot)org, Neil Conway <neilc(at)samurai(dot)com> |
| Subject: | Re: Wierd context-switching issue on Xeon |
| Date: | 2004-05-02 15:39:22 |
| Message-ID: | 1083512362.25096.131.camel@localhost.localdomain |
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| Lists: | pgsql-performance |
Robert,
The real question is does it help under real life circumstances ?
Did you do the tests with Tom's sql code that is designed to create high
context switchs ?
Dave
On Sun, 2004-05-02 at 11:20, Robert Creager wrote:
> Found some co-workers at work yesterday to load up my library...
>
> The sample period is 5 minutes long (vs 2 minutes previously):
>
> Context switches - avg max
>
> Default 7.4.1 code : 48784 107354
> Default patch - 10 : 20400 28160
> patch at 100 : 38574 85372
> patch at 1000 : 41188 106569
>
> The reading at 1000 was not produced under the same circumstances as the prior
> readings as I had to replace my device under test with a simulated one. The
> real one died.
>
> The previous run with smaller database and 120 second averages:
>
> Context switches - avg max
>
> Default 7.4.1 code : 10665 69470
> Default patch - 10 : 17297 21929
> patch at 100 : 26825 87073
> patch at 1000 : 37580 110849
--
Dave Cramer
519 939 0336
ICQ # 14675561
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