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Re: Threads in IDL 7.0 [message #63108 is a reply to message #63107]

Mon, 27 October 2008 10:26

Heinz Stege
Messages: 189
Registered: January 2003

Senior Member

On Mon, 27 Oct 2008 16:44:29 +0100, Bernhard Reinhardt wrote:

> Well, I wasnï¿½t really precise. Iï¿½m not doing this on a 1d-array but on a
> 4d-array, where 2 dimensions are time and 2 dimensions are space. I try
> to filter special events in time and count those on a 2d-map. Hereï¿½s the
> code:
>
> for i = 0, N_ELEMENTS(STRUC.data[*,0,0,0])-1 do begin
> for j = 0, N_ELEMENTS(STRUC.data[0,*,0,0])-1 do begin
> indices = Where(STRUC.data[i,j,*,*] GE 150., count)
> freq [i,j]=count
> endfor
> endfor
>
> Although the array data is quite big "where" only getï¿½s a small portion
> to see of it. So thread-pool isnï¿½t invoked. => CPU-Usage still 50%
>
> I also asked some more IDL-experienced colleagues about generating
> threads manually but they also didnï¿½t know about anything like that :(
>
> BUT using your method still brought me a gain of 3.6 times faster
> execution :)
>
> regards
>
> Bernhard

Please try the following command:

freq=total(total(STRUC.data ge 150.,4,/integer),3,/integer)

The IDL manual says, that TOTAL makes use of IDLï¿½s thread pool. And
there is no for-loop needed anymore...

HTH, Heinz

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[Message index]

		Re: Threads in IDL 7.0 By: Allan Whiteford on Tue, 28 October 2008 08:45
		Re: Threads in IDL 7.0 By: Vince Hradil on Tue, 28 October 2008 07:31
		Re: Threads in IDL 7.0 By: Vince Hradil on Tue, 28 October 2008 06:01
		Re: Threads in IDL 7.0 By: Bernhard Reinhardt on Tue, 28 October 2008 01:28
		Re: Threads in IDL 7.0 By: David Fanning on Mon, 27 October 2008 11:07
		Re: Threads in IDL 7.0 By: Allan Whiteford on Mon, 27 October 2008 10:27
		Re: Threads in IDL 7.0 By: Heinz Stege on Mon, 27 October 2008 10:26
		Re: Threads in IDL 7.0 By: Allan Whiteford on Mon, 27 October 2008 10:23
		Re: Threads in IDL 7.0 By: Foldy Lajos on Mon, 27 October 2008 09:59
		Re: Threads in IDL 7.0 By: Allan Whiteford on Mon, 27 October 2008 09:46
		Re: Threads in IDL 7.0 By: Foldy Lajos on Mon, 27 October 2008 09:11
		Re: Threads in IDL 7.0 By: Bernhard Reinhardt on Mon, 27 October 2008 08:44
		Re: Threads in IDL 7.0 By: David Fanning on Mon, 27 October 2008 06:23

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