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Re: load sharing on multiple machines? [message #28874 is a reply to message #28872]

Thu, 17 January 2002 20:34

Mark Rivers
Messages: 49
Registered: February 2000

Member

Michael A. Miller <mmiller3@iupui.edu> wrote in message
news:87sn9469qq.fsf@lumen.med.iupui.edu...
> Thanks for the feedback, Mark. Our main systems also have
> dual-CPU slots, although we haven't yet filled the second one.
> Do you have any ball-park numbers for how much IDL performance
> improvement you see when you use two instead of one processors?

I just ran a test on Linux
IDL> a = findgen(1000,1000)
IDL> b = findgen(1000,1000)+1.
IDL> for i=0,1000 do c=a/b

I monitored the system performance with "top". Both CPUs went from 1% busy
to 100% busy, indicating that IDL is using both CPUs effectively.

On the other hand:
IDL> for i=0,100 do c=fft(a,1)
the sum of the 2 CPUs busy was about 120%, indicating that it's not using
both CPUs very well.

My observations on Windows are consistent with this, some operations fully
utilize both CPUs, some don't.

Mark

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[Message index]

		Re: load sharing on multiple machines? By: Craig Markwardt on Fri, 18 January 2002 07:33
		Re: load sharing on multiple machines? By: Mark Rivers on Thu, 17 January 2002 20:34
		Re: load sharing on multiple machines? By: Pavel A. Romashkin on Thu, 17 January 2002 09:36
		Re: load sharing on multiple machines? By: mmiller3 on Thu, 17 January 2002 11:46
		Re: load sharing on multiple machines? By: Mark Rivers on Wed, 16 January 2002 20:07

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