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Re: Wierd context-switching issue on Xeon

From: Josh Berkus <josh(at)agliodbs(dot)com>
To: Robert Creager <Robert_Creager(at)LogicalChaos(dot)org>
Cc: pg(at)fastcrypt(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: 2004-04-29 18:21:51
Message-ID: 200404291121.51247.josh@agliodbs.com (view raw or flat)
Thread:
Lists: pgsql-performance
Rob,

> I would like to see the same, as I have a system that exhibits the same 
behavior
> on a production db that's running 7.4.1.

If you checked the thread follow-ups,  you'd see that *decreasing* 
spins_per_delay was not beneficial.   Instead, try increasing them, one step 
at a time:

(take baseline measurement at 100)
250
500
1000
1500
2000
3000
5000

... until you find an optimal level.   Then report the results to us!

-- 
-Josh Berkus
 Aglio Database Solutions
 San Francisco


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