Unrecognized function or variable 'nvcc'. with Matlab R2022a

I am running Matlab R2022a with CUDA 11.2 on Windows (Visual Studio Community 2019). I have a add_kernel.cu file in my folder but fail to compile it:

nvcc -ptx add_kernel.cu

Unrecognized function or variable 'nvcc'.

Matlab seems to recognize my CUDA version:

system('nvcc --version')

nvcc: NVIDIA (R) Cuda compiler driver

Copyright (c) 2005-2020 NVIDIA Corporation

Built on Mon_Nov_30_19:15:10_Pacific_Standard_Time_2020

Cuda compilation tools, release 11.2, V11.2.67

Build cuda_11.2.r11.2/compiler.29373293_0

ans =

0

I have looked around and people suggested to explicitly add the pathes of the ncc file and the VS execution which I already tried:

addpath(genpath('C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.29.30133\bin\Hostx64\x64'))

addpath(genpath('C:\Program Files\NVIDIA GPU Computing Toolkit\CUDA\v11.2\bin'))

I think it is irrelavent but Matlab also finds my GPU:

gpuDevice

CUDADevice with properties:

Name: 'NVIDIA GeForce RTX 3060'

Index: 1

ComputeCapability: '8.6'

SupportsDouble: 1

DriverVersion: 11.7000

ToolkitVersion: 11.2000

MaxThreadsPerBlock: 1024

MaxShmemPerBlock: 49152

MaxThreadBlockSize: [1024 1024 64]

MaxGridSize: [2.1475e+09 65535 65535]

SIMDWidth: 32

TotalMemory: 1.2884e+10

AvailableMemory: 1.1646e+10

MultiprocessorCount: 28

ClockRateKHz: 1777000

ComputeMode: 'Default'

GPUOverlapsTransfers: 1

KernelExecutionTimeout: 1

CanMapHostMemory: 1

DeviceSupported: 1

DeviceAvailable: 1

DeviceSelected: 1

I would be glad about any suggestions.

Answer 1

[Raymond Norris]

nvcc is a NVIDIA compiler, not a MATLAB function. I suspect what you want is mexcuda.

[Felix Wellschmied]

Thank you very much. I falsely read from the following article that nvcc is the Matlab comand and not mexcuda:

https://es.mathworks.com/help/parallel-computing/run-cuda-or-ptx-code-on-gpu.html#bsic4zj

My fault. Thank you for your quick reply!

[Ayaz ul Hassan Khan]

@Raymond Norris, I am getting the error in using mexcuda instead. Can you please help?

>> mexcuda -ptx myKernel.cu

Error using mex

Supported compiler not detected. For options, visit https://www.mathworks.com/support/compilers.

Error in mexcuda (line 185)

[varargout{1:nargout}] = mex(mexArguments{:});

[Raymond Norris]

Hi @Ayaz ul Hassan Khan this implies that you don't have mex setup properly. I would suggest running

mex -setup

and configuring MEX to your C compiler.

[Felix Wellschmied]

Just as a note, for me, the compiler is in a different directlory than in my original post:

"C:\Program Files\Microsoft Visual Studio\2022\Community\VC\Tools\MSVC\14.35.32215\bin\Hostx64\x64"

It obviously depends on the version of your VS.

[Ayaz ul Hassan Khan]

mex is already setup at my end but still getting the following error:

>> mexcuda -ptx myKernel.cu

Error using mex

Supported compiler not detected. For options, visit https://www.mathworks.com/support/compilers.

Error in mexcuda (line 185)

[varargout{1:nargout}] = mex(mexArguments{:});

>> mex -setup

MEX configured to use 'Microsoft Visual C++ 2022 (C)' for C language compilation.

To choose a different C compiler, select one from the following:

MinGW64 Compiler (C) mex -setup:'C:\Program Files\MATLAB\R2023b\bin\win64\mexopts\mingw64.xml' C

Microsoft Visual C++ 2022 (C) mex -setup:C:\Users\ayazh\AppData\Roaming\MathWorks\MATLAB\R2023b\mex_C_win64.xml C

To choose a different language, select one from the following:

mex -setup C++

mex -setup FORTRAN

MEX configured to use 'Microsoft Visual C++ 2022' for C++ language compilation.

To choose a different C++ compiler, select one from the following:

MinGW64 Compiler (C++) mex -setup:'C:\Program Files\MATLAB\R2023b\bin\win64\mexopts\mingw64_g++.xml' C++

Microsoft Visual C++ 2022 mex -setup:C:\Users\ayazh\AppData\Roaming\MathWorks\MATLAB\R2023b\mex_C++_win64.xml C++

>>

[Raymond Norris]

@Ayaz ul Hassan Khan please contact MathWorks Technical Support. They'll get this quickly resolved for you.

[Ayaz ul Hassan]

Thanks, contacted support. Hope to get quick resolution.