User`s guide

mxInitGPU (C)

11-201

mxInitGPU (C)

Initialize MATLAB GPU library on currently selected device

C Syntax

#include "gpu/mxGPUArray.h"

int mxInitGPU()

Returns

int type with one of the following values:

• MX_GPU_SUCCESS if the MATLAB GPU library is successfully initialized.

• MX_GPU_FAILURE if not successfully initialized.

Description

Before using any CUDA code in your MEX file, initialize the MATLAB GPU library if

you intend to use any mxGPUArray functionality in MEX or any GPU calls in MATLAB.

There are many ways to initialize the MATLAB GPU API, including:

• Call mxInitGPU at the beginning of your MEX file before any CUDA code.

• Call gpuDevice(deviceIndex) in MATLAB before running any MEX code.

• Create a gpuArray in MATLAB before running any MEX code.

You should call mxInitGPU at the beginning of your MEX file, unless you have an

alternate way of guaranteeing that the MATLAB GPU library is initialized at the start of

your MEX file.

If the library is initialized, this function returns without doing any work. If the library is

not initialized, the function initializes the default device. Note: At present, a MATLAB

MEX file can work with only one GPU device at a time.