how many workers can I use in parallelization?

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Chang seok Ma
Chang seok Ma 2021 年 11 月 23 日
回答済み: Kojiro Saito 2021 年 11 月 24 日
Hello, I am trying to use parallelization and I have one quick question.
I saw another post saying that 'I saw from another post saying that 'All releases newer than R2013b can utilize up to 512 workers (CPU cores) on a local machine through the Parallel Computing Toolbox'
However, I am not sure how many workers I can use with my computer.
I have 32 cores(64 logical cores) and 128 GB of memory.
Does this mean I can use 32 number of workers? or can I use 64 number of workers since I have 64 logical cores?
Or is 'number of workers' something independent from the number of cores?
In the Parallel preferences, I think I can write any number I want as a number of workers so I am bit confused....
Thanks in advance.
Edit. I put 36 as a number of workers in 'Parallel preferences' but when I run the code, it says the number of workers are 32. So I guess Matlab automatically choose the maximum number of workers....?


Kojiro Saito
Kojiro Saito 2021 年 11 月 24 日
You need to change the NumWokers property from Cluster Profile.
From "Parallel" -> "Create and Manage Clusters",
change the NumWorkers value to 64 because by default, it is the number of physical CPU cores.
Or, you can change from command line.
First, create a cluster object by parcluster, then change the NumWorkers to 64.
c = parcluster;
c.NumWorkers = 64;
% Do parpool or parfor etc.

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