How to have a global variable that can be accessed and edited and used inside a parfor loop? Or, how to show progress of a parallel job?

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Mhamad Hantro 2022-12-6

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https://ww2.mathworks.cn/matlabcentral/answers/1872052-how-to-have-a-global-variable-that-can-be-accessed-and-edited-and-used-inside-a-parfor-loop-or-how

评论： Mhamad Hantro 2022-12-6

I want to print the progress of my matlab code, and the idea is that I have a parfor loop, and I want to know which iterations are already been done, and it's very simple in concept, yet I can't find a way to implement it in MATLAB. What do you suggest?

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Stephen23 2022-12-6

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Answer 1

Raymond Norris 2022-12-6

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Workers in a parfor-loop can't communicate with each other, so a global variable won't work. Consider using a DataQueue. The provides a way for the workers to send information back to the client, which can aggregate results (e.g., how many iteration have been completed). In fact, the example towards the bottom show how to display the status in a waitbar.