How to specify GPU devices for parallel computing using "parfor"?

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ts
ts on 20 Dec 2021
Commented: ts on 20 Dec 2021
I have a workstation with four GPUs, and I want to run a parfor loop using specific two or three GPUs to share the workstation with other users. If you know how to specify gpu devices for parallel computing using "parfor", I would appreciate it if you could let me know.

Accepted Answer

Edric Ellis
Edric Ellis on 20 Dec 2021
The documentation here describes how you might do this in general. Things get a little more complicated if you want to run more workers than the number of GPUs you're accessing, but the principle is the same - set things up using gpuDevice inside an spmd block. That then sets the GPU in use by the worker process, and parfor loops will continue to use that device.
  1 Comment
ts
ts on 20 Dec 2021
Thank you very much! The documentation and your anwer were very helpful. The following code specifies GPUs #2, #3, #4 to workers #1, #2, #3, respectively, and then following parfor loop uses the specified GPUs.
useGPUs = [2 3 4];
spmd
gpuDevice(useGPUs(labindex));
end
parfor
...
end

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