How to reduce the number of workers in the backgroundPool?

Question

James London 2024-3-1

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2088866-how-to-reduce-the-number-of-workers-in-the-backgroundpool

评论： Walter Roberson 2024-3-2

I would like to limit the backgroundPool to 2 workers. But when I restart my computer, then open MATLAB, then run the following code I get 10 workers. Is there anyway to reduce the number of backgroundPool workers? Thanks in advance!

Input:

maxNumCompThreads(1)
backgroundPool

Output:

>> maxNumCompThreads(1)
ans =
     6
>> backgroundPool
ans = 
 BackgroundPool with properties: 
           NumWorkers: 10
                 Busy: false

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James London 2024-3-1

Good to know! Thanks!

I am using an Intel i5-12600KF processor which I belive has 6 P-cores and 4 E-cores.

I am performing live image processing from a custom microscope. I am doing the image processing on the backgroundPool. This allows a user of the microscope to use a GUI to adjust the movemnt of the microscope in real time while images a being processed. The processing does take up a fair amount of RAM but is very fast. I want to limit the number of backgroundPool workers to prevent all of the RAM from being used by the backgroundPool so that new images can come in and be queued up for processing.

Walter Roberson 2024-3-1

If you parfeval() exactly two functions, then the memory will not build up.

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Answer 1

Monisha 2024-3-2

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2088866-how-to-reduce-the-number-of-workers-in-the-backgroundpool#answer_1419876

delete(gcp('nocreate')); % Delete any existing parallel pool parpool(2); % Create a new parallel pool with 2 workers

This code will delete any existing parallel pool and create a new one with only 2 workers. Place this code at the beginning of your script or function to ensure that it's executed whenever MATLAB starts. This should help you maintain the desired number of workers even after restarting your computer and reopening MATLAB.