Asynchronous Transfer cudaMemcpy()

Accelerated Computing CUDA CUDA Programming and Performance
1

Hi,

cudaMemcpy()‏ is an Asynchronous Transfer. What do we exactly mean by tbis? and what will br synchronous transfer anyways.

Thanks

2

cudaMemcpyAsync is the asynchronous variant. This means that control returns to the host thread immediately. You can’t be sure the transfer is complete until you’ve synchronised against the stream used for the copy.