How can I know which worker performs each iteration of the parfor loop?

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Policarpo Abascal 2024-5-2

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评论： Policarpo Abascal 2024-5-6

I want to know if it is possible to determine which worker performs each iteration of the parfor loop or if it is possible to assign each iteration to a worker.

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Thomas Ibbotson 2024-5-2

We would usually advise against this, so it would be good to know why you want to do this. I will answer your question in detail below.

Policarpo Abascal 2024-5-6

Thank you. I have found the answer to my question in the suggestions you provided with 'getcurrentworker'.

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Answer 1

Thomas Ibbotson 2024-5-2

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You can find out which worker is running your code using the following function: https://uk.mathworks.com/help/parallel-computing/getcurrentworker.html

You can achieve more control over how iterations are divided amongst worker using parforOptions: https://uk.mathworks.com/help/parallel-computing/parforoptions.html

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Answer 2

Edric Ellis 2024-5-2

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编辑：Edric Ellis 2024-5-2

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You can use getCurrentTask (if you're using a process pool rather than a thread pool). This has a field ID which tells you which task is operating, like this:

parfor i = 1:N
    t = getCurrentTask();
    fprintf('Iteration %d on task %d\n', i, t.ID);
end

It's not possible with parfor to assign iterations to workers. You can have more control with spmd - but we'd need to know more about what it is you're trying to achieve.