access to a gpuArray from a MEX file?

Question

Jim Mutch 2011-7-14

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/11591-access-to-a-gpuarray-from-a-mex-file

I did a lot of work with CUDA MEX files before gpuArray was an option. Now I would like to simplify my interface to these MEX files by allowing them to access data that the user has stored in gpuArrays -- but I do not want to rewrite all my code.

So: what I need is a way for my MEX code to access a gpuArray's internal pointer to GPU memory, and other metadata. Is there a way to do this?

I suppose I would also need access to the Parallel Computing Toolbox's CUDA context for this to work.

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Answer 1

Edric Ellis 2011-7-14

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https://ww2.mathworks.cn/matlabcentral/answers/11591-access-to-a-gpuarray-from-a-mex-file#answer_15822

You're right that you need Parallel Computing Toolbox to access gpuArray functionality. We don't offer a MEX interface with gpuArrays, but we do offer the CUDAKernel which allows you to use gpuArrays together with hand-written CUDA code. Here's the doc for CUDAKernel.

We think that CUDAKernel is easier to use than a MEX layer because you only need to write the "__global__" entry points for CUDA, you don't need to write any of the code to marshal data in and out of mxArrays.