access to a gpuArray from a MEX file?

2011 7 14
2 个回答
回答已采纳
6 次查看（30 天）

0 个投票

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.

请先登录，再回答此问题。

 采纳的回答

Edric Ellis
Edric Ellis 2011-7-14

0 个投票

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.

4 个评论
显示 2更早的评论 隐藏 2更早的评论

Jim Mutch
Jim Mutch 2011-7-14
Thanks for the reply. It may indeed be easier for new code development, but not necessarily for people with existing CUDA MEX files.
King Fisher
King Fisher 2011-11-27
Edric,
I ve tested the MATLAB .cu code and generate a .ptx file for it. But when I execute it on matlab the following error occurs:
??? Error using ==> iParseToken at 266
Unsupported type in argument specification "fahad.cu".
Error in ==>
/usr/local/Matlab/2011a/toolbox/distcomp/gpu/+parallel/+internal/+gpu/handleKernelArgs.p>iParseCPrototype at 192
Error in ==>
/usr/local/Matlab/2011a/toolbox/distcomp/gpu/+parallel/+internal/+gpu/handleKernelArgs.p>handleKernelArgs at 79
To let you clear that Gpu is funtioning well in my Matlab environment for other functions ,example, gpuarray().
Would you please figure out the problem !
Walter Roberson
Walter Roberson 2011-11-27
King Fisher, I recommend that you start a new Question for this.
Daniel Armyr
Daniel Armyr 2013-3-18
With the release of 2013a, though, you can do what the original poster wanted. See this: http://www.mathworks.se/help/distcomp/create-and-run-mex-files-containing-cuda-code.html

请先登录，再进行评论。

更多回答（1 个）

John Melonakos
John Melonakos 2011-7-17

0 个投票

Jacket users have access to the Jacket SDK that has advantages over the other two approaches: http://blog.accelereyes.com/blog/2010/10/29/jacket_sdk_trumps_mex/

1 个评论
显示 -1更早的评论 隐藏 -1更早的评论

Jim Mutch
Jim Mutch 2011-7-17
Perhaps, but in my question I said "I do not want to rewrite all my code". So this is off topic.
Do you guys need to pop up in every GPU-related thread?

请先登录，再进行评论。

类别

在 帮助中心 和 File Exchange 中查找有关 GPU Computing 的更多信息

产品

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by