In CUDA, some transfers involving pageable host memory are completely synchronous from the perspective of the host, even if you use `cudaMemcpyAsync`: https:/

In CUDA, some transfers involving pageable host memory are completely synchronous from the perspective of the host, even if you use `cudaMemcpyAsync`: https://docs.nvidia.com/cuda/cuda-runtime-api/api-sync-behavior.html#api-sync-behavior__memcpy-async https://docs.nvidia.com/cuda/cuda-runtime-api/api-sync-behav... Pinned memory is typically used to get around the synchronization aspects.