parcellfun (or cellfun) overhead

[Daniel Arteaga]

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