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[Caml-list] FP's and HyperThreading Processors

David McClain
- John Max Skaller
  - Christophe Raffalli
    - Xavier Leroy
      - brogoff@s...
        
        Brian Hurt
        
        Jacques Garrigue
- Kip Macy
  - David McClain
    - Kip Macy
      - David McClain
        
        John Max Skaller
    - Ville-Pertti Keinonen
- Xavier Leroy
  - David Monniaux
  - Jim Farrand
    - David McClain

Date:	-- (:)
From:	Jim Farrand <jim@f...>
Subject:	Re: [Caml-list] FP's and HyperThreading Processors

On Fri, Jun 13, 2003 at 09:07:51PM +0200, Xavier Leroy wrote:

> How do you measure "CPU utilization"?  Different tools have different
> notions of CPU utilization.  For instance, OS-level tools such as
> "top", "ps" or "uptime" treat the time spent by the CPU while stalled
> by cache misses and the like as user CPU time, not as idle time.
> Only processor-level performance monitor counters can distinguish
> between active cycles and stalled cycles.

Isn't the point of hyperthreading that the CPU doesn't stall on cache
misses, but instead is able to run another process?  Or am I
misunderstanding the point of hyperthreading?
-- 
Jim Farrand
-- 

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