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Re: parcellfun (or cellfun) overhead


From: Daniel Arteaga
Subject: Re: parcellfun (or cellfun) overhead
Date: Tue, 01 Feb 2011 11:57:46 +0100
User-agent: Mozilla/5.0 (X11; U; Linux i686; ca-ES; rv:1.9.2.13) Gecko/20101207 Thunderbird/3.1.7

Al 01/02/11 11:54, En/na c. ha escrit:

On 1 Feb 2011, at 11:43, Daniel Arteaga wrote:

Hi,
I paralellize a piece of code in the following way:
anonyFunc = @(x) func(x, paramStruct);
splB = parcellfun(nThreads, anonyFunc, dataCell);
where "paramStruct" is a very large structure array (70000 elements), and 
"dataCell" contains each one of the imput data.
The function "func" takes takes around 50 ms, (measured with tic-toc), but when 
calling it with parcellfun it takes much longer, around 500 ms.
Same happens when replacing parcellfun with cellfun.
I suspect that this is due to the large size of paramStruct, because this does not happen 
when replacing "func" by a dummy function.
Any ideas of how could improve the situation?
Many thanks in advance,
Daniel Arteaga

What version of Octave are you using? on what OS?

Sorry, I forgot to mention that. I'm using Octave 3.2.3 under Ubuntu Linux 10.04.

D.



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