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Error using PARFOR: Index exceeds the number of array elements

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I'm using a parfor loop in my GA algorithm. After some time of running this error pops up:
Error using distcomp.remoteparfor/getCompleteIntervals
Index exceeds the number og array elements (0)
Can someone please help me fix it?

Accepted Answer

Walter Roberson
Walter Roberson on 27 Feb 2021
global variables are not copied to workers when you use Parallel Computing Toolbox, and setting the variable on one worker does not affect the others.
You can in some circumstances use parpool constant. Or you can use parfevalOnAll to run an initialization function on all the workers.
Walter Roberson
Walter Roberson on 27 Feb 2021
I could hypothesize that it was not until that point that one of your nonlinear constraints happened to try to access the (empty) global variable. You should rewrite to not use global variables.
I would also recommend that you put in an OutputFcn that saves the current population from time to time -- not necessarily every iteration as that could be too expensive. Enough iterations to be (say) roughly 10 minutes. Using a different file for each worker. The idea would be that if you had a failure you would be able to reconstruct a recent population and start running from that.

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