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Splitting large for loop over multiple processors [message #92830]

Wed, 09 March 2016 02:40

joellama
Messages: 8
Registered: July 2013

Junior Member

Hi all,

I know, I know before I get lots of hate that I shouldn't have a for loop in my code...this isn't my code, it's code someone else wrote and I just haven't got the time go through and vectorise it.

Basically I have an output array that is say

out = fltarr(nx, ny, nz) where nx=ny=nz=100 each

The way the code is currently written it has

for i = 0, nx-1 do begin
for j = 0, ny-1 do begin
for k = 0, nz-1 do begin
.... a lot of calculations
endfor
endfor
endfor

Basically, all I want to do is split this over all the cores on my mac pro so that it does say

0 - nx/6 on cpu 1
nx/6 - 2*nx/6 on cpu 2 etc...

I saw this article http://www.exelisvis.com/Company/PressRoom/Blogs/TabId/836/A rtMID/2928/ArticleID/14744/Using-IDL-IDLBridge-to-run-multip le-processes-in-parallel.aspx

but the example isn't exactly easy to follow.

If anyone has any tips I would really appreciate it.

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[Message index]

		Splitting large for loop over multiple processors By: joellama on Wed, 09 March 2016 02:40
		Re: Splitting large for loop over multiple processors By: Jeremy Bailin on Tue, 15 March 2016 08:30

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