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Re: Parallelise FOR loop in IDL [message #77756 is a reply to message #77680]

Tue, 20 September 2011 07:21

Kenneth P. Bowman
Messages: 585
Registered: May 2000

Senior Member

In article <j57e3h$9sv$1@speranza.aioe.org>,
Robin Wilson <robin@rtwilson.com> wrote:

> Hi,
>
> I have some IDL code like the following, which implements a Monte Carlo
> ray-tracing model:
>
>
> FOR i = 0, 1000 DO BEGIN
> ; Start a new ray from source
> ; Do all sorts of complicated processing on it
> ; Record where it lands
> ENDFOR
>
> I want to be able to run it for more iterations while still keeping it
> fairly fast. If I was writing this in C I'd use OpenMP to split the
> iterations of the loop between the available cores (as they are
> independent) and then use a reduction to join all of the records of
> where the rays end up together.

If it is trivially parallel, why not run, for example, ten separate IDL
jobs with

FOR i = 0, 99 DO BEGIN ...

Simple minded, but probably much easier to implement than a true
parallel solution.

Ken Bowman

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[Message index]

		Parallelise FOR loop in IDL By: Robin Wilson on Mon, 19 September 2011 05:55
		Re: Parallelise FOR loop in IDL By: Kenneth P. Bowman on Tue, 20 September 2011 07:21

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