GPUs in our system have ids from 0 to n-1 where n is the total number of GPUs.
Only one GPU is set as current GPU. Current GPU means a GPU which is ready for computation.
We can find out id of current GPU by calling function cudaGetDevice().
e.g.
int device_id;
cudaGetDevice(&device_id);
Note: Here, device_id gives id of current GPU after calling cudaGetDevice(&device_id) function.
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