Select a GPU to be used by a function running in parallel(parfeval)
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Hello,
I am using two GPUs in a GUI postprocessing images live.
I am using the 'FramesAcquiredFcn' as a hub to transfer data from the buffer to the CPU RAM memory ('getdata') and launch a 'parfeval' function on GPU postprocessing these data. I have 1 pool with 3 workers initialized (one for the 'FramesAcquiredFcn' and one for each GPU). I can check that when the 'parfeval' function is not finished at the next iteration the second GPU is used instead. Now, I know that using 'wait' I can force the first GPU to be used.
However, I would like to split my postprocessing between these two GPUs because one is more powerful than the other. Hence, I would need the first 'parfeval' function to use the GPU1 pass the outputs (using 'afterEach'?) to an other parfeval function using the GPU2.
I have read the 'help selectGPU' but could not figure out how to modify it for my purpose.
Any help will be welcome.
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Joss Knight
2019년 8월 18일
I'd have to know what kind of postprocessing you're doing - please post some code. On the face of it, the answer is simply to use gpuDevice(i) to select a particular device for each of your parfeval calls.
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Joss Knight
2019년 8월 21일
You can use a third-party scheduler and give it the properties you like, but I suspect that is not really what you're after. I think the real issue here is that MATLAB has no way to switch devices without resetting the device, which is slow; this is something we intend to improve.
You may be able to use client/worker parallelism here. Do your front-end work on the client on one GPU and dispatch your background work to a single worker that has the other GPU selected (or multiple GPUs all of which have the other GPU selected, if that's appropriate).
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