CUDA Academy · Lesson

Host-to-Device Transfers

Uploading input data to the GPU.

Two Memories, One Goal

Your data starts in host RAM, but the GPU can only crunch numbers that live in its own device memory. First you must move it across. 🚚

The cudaMemcpy function is your delivery truck: it copies a block of bytes from one address to another, host or device.

cudaMemcpy(dst, src, bytes, kind);