While profiling application with nvprof I found both PtoP and DtoD memcpy. I am not sure about the difference between these two.
What's the difference between DtoD and PtoP memory copies?
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Device to device (DtoD) is a copy within a single GPU.
Peer to Peer (PtoP) is from one GPU to another.
The latter only happens in multi-GPU systems.
And for other transfers host refers to CPU, device refers to GPU.
The naming device to device transfer predates a lot of the work on multiple GPUs, otherwise the naming might have been a little different.