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Re: Confusion about nthread and ncore [message #89731 is a reply to message #89726]

Fri, 21 November 2014 03:59

Sergey Anfinogentov is currently offline

Sergey Anfinogentov
Messages: 11
Registered: September 2012

Junior Member

It depends on the code.
The best way is to make an experiment using your computer and your code.

You can measure the execution time of your program with default settings then you can change threads count via "cpu,TPOOL_NTHREADS = 4" and ,measure the execution time again.

четверг, 20 ноября 2014 г., 18:04:10 UTC пользователь chu xiangning написал:
> Hi All
> It has always been confusing to me how IDL handles nthread and ncores.
> I have an i7 which has 4 physical cores and 8 threads.
> Matlab recognizes i7 as 4 cores and uses 4 threads. IDL recognizes i7 as 8 threads.
> In my opinion, in a computation-heavy program, 4 threads should be used instead of 8, because using 8 threads actually slows down the program.
> Is this correct?

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[Message index]

		Confusion about nthread and ncore By: chuxiangning on Thu, 20 November 2014 10:04
		Re: Confusion about nthread and ncore By: Sergey Anfinogentov on Fri, 21 November 2014 03:59
		Re: Confusion about nthread and ncore By: chuxiangning on Tue, 25 November 2014 09:38
		Re: Confusion about nthread and ncore By: victor.cazcarra on Thu, 27 November 2014 01:05
		Re: Confusion about nthread and ncore By: chuxiangning on Sat, 29 November 2014 16:40

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