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Re: Multi-core techniques [message #70421 is a reply to message #70420]

Fri, 16 April 2010 03:47

Juggernaut
Messages: 83
Registered: June 2008

Member

On Apr 16, 5:02 am, Allard de Wit <allard.de...@wur.nl> wrote:
> Dear Tim,
>
> My experience with the IDL thread pool is that for certain type of
> operations in ENVI, the thread pool is actually slowing things down.
> The most notable example was a "Sum data bands" operation in ENVI
> which executed extremely slow. After disabling the thread pool (cpu,
> TPOOL_NTHREADS=1), the operation executed several times faster. Maybe
> some IDL internals that decide on when to use or not to use the thread
> pool, performed poorly in the case.
>
> Another approach on parallelizing your process is to use the
> IDL_IDLbridge which allows you to spawn multiple IDL session which can
> run on different cores. You may want to have a look at my process
> manager, which uses this technique to distribute processing tasks over
> several bridges. You can get the code here:
> ftp://sc:ima...@ftp.alterra.nl/pub/adewit/process_manager.zi p
>
> Allard de Wit

Other methods include the use of the IDL_IDLBridge to spawn a separate
processes on the other core. I've found this works well if the
overhead of setting up the IDL_IDLBridge object is low.

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[Message index]

		Re: Multi-core techniques By: Juggernaut on Fri, 16 April 2010 03:49
		Re: Multi-core techniques By: Juggernaut on Fri, 16 April 2010 03:47
		Re: Multi-core techniques By: wita on Fri, 16 April 2010 02:02
		Re: Multi-core techniques By: Tim B on Fri, 16 April 2010 01:19
		Re: Multi-core techniques By: Maxwell Peck on Fri, 16 April 2010 00:35
		Re: Multi-core techniques By: David Fanning on Thu, 15 April 2010 19:14
		Re: Multi-core techniques By: natha on Fri, 16 April 2010 06:54

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