Re: lcpu ?
From: Simon Marchese (sjm_news_at_yahoo.co.uk)
Date: 06/03/05
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Date: Fri, 3 Jun 2005 09:24:16 +0000 (UTC)
jhidalgo wrote:
> Hi all,
>
> someone knows why i get 16 LCPUs in many performance tools when i only
> have 8 physical CPUs in my box ?
<snip>
You have a p5 machine running AIX 5.3 which therefore supports
Simultaneous Multithreading (SMT), which uses additional registers on
the chip to make a single CPU look like two to the OS. Understanding the
performance you're getting needs a little more understanding than in a
non-SMT environment but it's worth it - for about 10% more transistors
you can get up to 30% better performance.
FOr further information, go to http://www.redbooks.ibm.com and look at
"AIX 5L Differences Guide Version 5.3 Edition" - in particular the
chapter on Performance Monitoring.
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