Sign Up to our social questions and Answers Engine to ask questions, answer people’s questions, and connect with other people.
Login to our social questions & Answers Engine to ask questions answer people’s questions & connect with other people.
Lost your password? Please enter your email address. You will receive a link and will create a new password via email.
Please briefly explain why you feel this question should be reported.
Please briefly explain why you feel this answer should be reported.
Please briefly explain why you feel this user should be reported.
I’m curious to know what happens if I set the parameter “count” in cudaMemcpyAsync to zero, i.e. cudaMemcpyAsync(dst, src, count, cudaMemcpyDeviceToHost, stream)? In my code, the function returns cudaSuccess, but is the copy still executed?
Err, yes, zero bytes are copied from source to destination.
But, since there’s no distinction between copying and not copying for that particular size, it’s irrelevant.
If you’re asking if there’s any sort of device-to-host communication for a zero-sized buffer, that’s an implementation detail that is not specified (I wouldn’t bet money on it though since it would be somewhat inefficient).