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* Hyperthreading slows processes?
@ 2005-11-20 21:46 Craig A. James <cjames@modgraph-usa.com>
0 siblings, 1 reply; 2+ messages in thread
From: Craig A. James @ 2005-11-20 21:46 UTC (permalink / raw)
To: ; +Cc: pgsql-performance
This article on ZDNet claims that hyperthreading can *hurt* performance, due to contention in the L1/L2 cache by a second process:
http://news.zdnet.co.uk/0,39020330,39237341,00.htm
Has anyone tested this on Postgres yet? (And based on a recent somewhat caustic thread about performance on this forum, I'm going to avoid speculation, and let those who actually *know* answer! ;-)
Craig
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* Re: Hyperthreading slows processes?
@ 2005-11-21 01:24 Dave Cramer <pg@fastcrypt.com>
parent: Craig A. James <cjames@modgraph-usa.com>
0 siblings, 0 replies; 2+ messages in thread
From: Dave Cramer @ 2005-11-21 01:24 UTC (permalink / raw)
To: Craig A. James <cjames@modgraph-usa.com>; +Cc: pgsql-performance
Yeah, it's pretty much a known issue for postgres
Dave
On 20-Nov-05, at 4:46 PM, Craig A. James wrote:
> This article on ZDNet claims that hyperthreading can *hurt*
> performance, due to contention in the L1/L2 cache by a second process:
>
> http://news.zdnet.co.uk/0,39020330,39237341,00.htm
>
> Has anyone tested this on Postgres yet? (And based on a recent
> somewhat caustic thread about performance on this forum, I'm going
> to avoid speculation, and let those who actually *know* answer! ;-)
>
> Craig
>
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> broadcast)---------------------------
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>
> http://archives.postgresql.org
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2005-11-20 21:46 Hyperthreading slows processes? Craig A. James <cjames@modgraph-usa.com>
2005-11-21 01:24 ` Dave Cramer <pg@fastcrypt.com>
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