hipMemcpy

HipMemcpy is a function provided by the HIP (Heterogeneous-Compute Interface for Portability) runtime API, which is designed to facilitate the transfer of data between different memory spaces in a heterogeneous computing environment. This function is analogous to the cudaMemcpy function in the CUDA runtime API, allowing developers to copy data between host (CPU) and device (GPU) memory, or between different regions of device memory.

The hipMemcpy function is defined with the following signature:

hipError_t hipMemcpy(void dst, const void src, size_t sizeBytes, hipMemcpyKind kind);

The parameters of the function are as follows:

dst: A pointer to the destination memory location.

src: A pointer to the source memory location.

sizeBytes: The number of bytes to be copied.

kind: The type of memory copy to be performed, which can be one of the following values:

hipMemcpyHostToHost: Copy data from host to host.

hipMemcpyHostToDevice: Copy data from host to device.

hipMemcpyDeviceToHost: Copy data from device to host.

hipMemcpyDeviceToDevice: Copy data from device to device.

hipMemcpyDefault: The runtime will determine the direction of the transfer.

The hipMemcpy function returns a hipError_t value, which indicates the success or failure of the memory copy operation. If the function returns hipSuccess, the memory copy was successful. Otherwise, an error code is returned, which can be used to diagnose the problem.

HipMemcpy is a fundamental function in the HIP runtime API, providing a simple and efficient way to transfer data between different memory spaces in a heterogeneous computing environment. By using hipMemcpy, developers can write portable code that can run on both NVIDIA and AMD GPUs, as well as other heterogeneous computing platforms that support the HIP runtime API.