| 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 |
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| 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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