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Re: Hyperthreading and IDL? [message #41152 is a reply to message #41142]

Wed, 29 September 2004 04:23

Edd Edmondson
Messages: 50
Registered: January 2003

Member

Jonathan Greenberg <greenberg@ucdavis.edu> wrote:
> Has anyone done any performance tests looking at IDL 6.0 (or 6.1) under
> hyperthreaded architectures? I see that certain processes max the processor
> out at exactly 50%, which makes me think that I'm getting a 50% performance
> hit just using the hyperthreading enabled. Thoughts? Experience?

It's probably a figment of the way the hyperthreaded CPU appears to the
kernel - as one CPU or as two or whatever. It'd be best to do some sort of
quick benchmark. Use 'timer=SYSTIME(/SECONDS)' before some long routine
and then do a 'print, SYSTIME(/SECONDS)-timer' to see how much time has
elapsed. You should pretty quickly be able to tell if you're actually
getting a performance hit (which I'd be surprised if you did).

--
Edd

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		Re: Hyperthreading and IDL? By: Marc R. Reinig on Wed, 29 September 2004 12:51
		Re: Hyperthreading and IDL? By: Edd Edmondson on Wed, 29 September 2004 04:23

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