Is cudaMemcpy from host to device executed in parallel?

In the case of the synchronous API call with regular pageable user allocated memory, the answer is it runs on both . The driver must first copy data from the source memory to a DMA mapped source buffer on the host, then signal to the GPU that data is waiting for transfer. The GPU then executes the transfer.

The process is repeated as many times as necessary for the complete copy from source memory to the GPU.

I believe a transfer from host to GPU memory is a blocking call. It uses the entire bus and, as such, it doesn't really make sense (even if it was physically possible) to run multiple operations in parallel.

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