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Re: Threads in IDL 7.0 [message #63102 is a reply to message #63091]

Tue, 28 October 2008 01:28

Bernhard Reinhardt
Messages: 26
Registered: October 2008

Junior Member

Heinz Stege wrote:
> 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...

Now thatï¿½s fast! Who cares about threads? ;) Thanks to everyone.

Regards

Bernhard

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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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