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Do I need cudaSetDevice before cudaStreamSynchronize?

原文 2020-08-29 14:19:59 9 1 c++/ cuda/ nvidia

In my system I program multiple GPUs concurrently. Do I need to call cudaSetDevice() before calling cudaStreamSynchronize() ?

When creating the cudaStream_t objects, I did set the device correctly before calling cudaStreamCreate() .

1 answers

I may be wrong but I don't think you need to call the function cudaSetDevice() again if you already used it when creating the stream.

Resources:

https://developer.nvidia.com/blog/cuda-pro-tip-always-set-current-device-avoid-multithreading-bugs/

https://forums.developer.nvidia.com/t/how-many-times-does-cudasetdevice-need-to-be-called/10646

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