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Re: Wierd context-switching issue on Xeon patch for 7.4.1

From: Christopher Kings-Lynne <chriskl(at)familyhealth(dot)com(dot)au>
To: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: pg(at)fastcrypt(dot)com, Josh Berkus <josh(at)agliodbs(dot)com>,Paul Tuckfield <paul(at)tuckfield(dot)com>, Anjan Dave <adave(at)vantage(dot)com>,Neil Conway <neilc(at)samurai(dot)com>, Dirk Lutzeb├Ąck <lutzeb(at)aeccom(dot)com>,pgsql-performance(at)postgresql(dot)org
Subject: Re: Wierd context-switching issue on Xeon patch for 7.4.1
Date: 2004-04-22 04:44:07
Message-ID: 40874D97.5030401@familyhealth.com.au (view raw or flat)
Thread:
Lists: pgsql-performance
> Yeah.  I don't know a reasonable way to tune this number automatically
> for particular systems ... but at the very least we'd need to find a way
> to distinguish uniprocessor from multiprocessor, because on a
> uniprocessor the optimal value is surely 1.

 From TODO:

* Add code to detect an SMP machine and handle spinlocks accordingly 
from distributted.net, http://www1.distributed.net/source, in 
client/common/cpucheck.cpp

Chris


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