matlab parallel computing/GPU error msg

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Nick Tsui
Nick Tsui 2012-3-9
my code:
kp = parallel.gpu.CUDAKernel('derivative.ptx','derivative.cu','derivative');
my error message:
"??? Undefined variable "parallel" or class "parallel.gpu.CUDAKernel"."
I know that my code is not completely right, but I expect it gets something else, at least not this error message, which I do not know how to interpret. Does that mean I do not have a nVidia GPU card on my computer? Or does that mean my Matlab is too old (R2009) to support parallel computing? Surprisingly, when I googled this error message, not many results showed up.
I ran the same line on another machine, the error message was:
"Error using handleKernelArgs (line 48) The first input to parallel.gpu.CUDAKernel must be a file that contains PTX code or a string that is PTX code."
So can I still use parallel computing on my computer? If so, what should I do?
Any suggestion is appreciated. Thanks a lot.
Nick

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采纳的回答

Jason Ross
Jason Ross 2012-3-9
  1 个评论
Jill Reese
Jill Reese 2012-3-9
Jason is correct. You are using a MATLAB version that doesn't support GPU computing. You'll need to upgrade to at least R2010b, but you should use the most recent release you have available. R2010b was the first to enable GPU computing, but each subsequent release added many new features and performance improvements.

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更多回答（2 个）

Malcolm Lidierth
Malcolm Lidierth 2012-3-9
I think it means you do not have the Parallel Computing Toolbox. Try
ver
at the command line.
Walter Roberson
Walter Roberson 2012-3-9
Right: PCT not installed or not licensed.
PCT is an optional extra-cost toolbox.
Further note: GPU use requires an NVidia card with CUDA 1.3 or later. There are a lot of NVidia cards that support only CUDA 1.2, so before spending money on the PCT, check the CUDA version supported by your card http://developer.nvidia.com/cuda-gpus
  1 个评论
Jason Ross
Jason Ross 2012-3-9
To be very pedantic and boring, Walter is referring to the "Compute Capability" of a given GPU, which needs to be 1.3 or higher. The linked page displays this very nicely.
The CUDA Version is something that's determined by the CUDA driver installed on the machine, and it's independent of the hardware. Generally speaking, it's a good idea to have the most recent CUDA driver installed, which you get from nVidia's driver download section:
http://www.nvidia.com/Download/index.aspx?lang=en-us

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