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Re: Wierd context-switching issue on Xeon

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us>
Cc: pg(at)fastcrypt(dot)com,Robert Creager <Robert_Creager(at)LogicalChaos(dot)org>,Josh Berkus <josh(at)agliodbs(dot)com>, Dirk_Lutzebäck <lutzeb(at)aeccom(dot)com>,ohp(at)pyrenet(dot)fr, Joe Conway <mail(at)joeconway(dot)com>,"scott(dot)marlowe" <scott(dot)marlowe(at)ihs(dot)com>,pgsql-performance(at)postgresql(dot)org, Neil Conway <neilc(at)samurai(dot)com>
Subject: Re: Wierd context-switching issue on Xeon
Date: 2004-05-20 03:58:56
Message-ID: 25437.1085025536@sss.pgh.pa.us (view raw or flat)
Thread:
Lists: pgsql-performance
Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us> writes:
> Tom Lane wrote:
>> ...  The SMP issue seems to be not with whether there is
>> instantaneous contention for the locked datastructure, but with the cost
>> of making it possible for processor B to acquire a lock recently held by
>> processor A.

> I see.  I don't even see a TODO in there.  :-(

Nothing more specific than "investigate SMP context switching issues",
anyway.  We are definitely in a research mode here, rather than an
engineering mode.

ObQuote: "Research is what I am doing when I don't know what I am
doing." - attributed to Werner von Braun, but has anyone got a
definitive reference?

			regards, tom lane

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Subject: Re: Wierd context-switching issue on Xeon
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