can one CPU talk to more than one GPU

[seckaka]

Hi guys,

Is it possible to write a CUDA program that uses one CPU to drive more than one GPU?? :rolleyes:
Is there any restriction that there is one -to -one mapping between CPU-GPU??

since the CPU has to wait until the GPU completes the computation…instead it can be used to give compute instructions for another GPU.

any suggestions
Thanks in advance

[cirus]

Hi guys,

Is it possible to write a CUDA program that uses one CPU to drive more than one GPU??

Yes.Using cudaSetDevice()

Is there any restriction that there is one -to -one mapping between CPU-GPU??

since the CPU has to wait until the GPU completes the computation…instead it can be used to give compute instructions for another GPU.

any suggestions

Thanks in advance

Yes, two GPUs can not interact with each other but through CPU.

[_Big_Mac]

You will basically need a CPU thread for each GPU you want to address.

cudaSetDevice works within the thread that invoked it, so there’s a 1-1 mapping between a GPU and a CPU thread. You can naturally run more than one thread on a CPU.

[seckaka]

Thank You cirus and Big_Mac
that helped a lot External Image