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

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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.
  2 Comments
Thomas Ibbotson
Thomas Ibbotson on 2 May 2024
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
Policarpo Abascal on 6 May 2024
Thank you. I have found the answer to my question in the suggestions you provided with 'getcurrentworker'.

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Answers (2)

Thomas Ibbotson
Thomas Ibbotson on 2 May 2024
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

Edric Ellis
Edric Ellis on 2 May 2024
Edited: Edric Ellis on 2 May 2024
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.

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