matlab parfor to evaluate a function in bunch of 4 rather than all at the same time

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H-H 2014-9-11

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https://ww2.mathworks.cn/matlabcentral/answers/154343-matlab-parfor-to-evaluate-a-function-in-bunch-of-4-rather-than-all-at-the-same-time

回答： Edric Ellis 2014-9-11

Hi all, I want to use matlab parallel functionality of parfor. However, my function doesn't allow the parallel evaluation of more than 4 at the same time due to the license issue. Is there a way that matlab uses parallel but in bunch of 4? for example,

 parfor i = 1:100
   t = function;
 end

This probably, run 100 function evaluations at the same time. I want matlab to run my function parallel in bunch of 4.

is there any way to do so?

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Answer 1

Edric Ellis 2014-9-11

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https://ww2.mathworks.cn/matlabcentral/answers/154343-matlab-parfor-to-evaluate-a-function-in-bunch-of-4-rather-than-all-at-the-same-time#answer_151336

在 MATLAB Online 中打开

The number of simultaneous function evaluations will be determined by the size of the parallel pool that you open. So, if you were to execute

parpool('local', 4)

before executing the PARFOR loop, then no more than 4 instances of 'function' would execute simultaneously. (If you're using an earlier release of MATLAB, you might need to say "matlabpool open local 4" instead of the 'parpool' command).