GPU simple matrix multiplication

Hi, I have a problem carrying out the most basic matrix multiplication on the GPU. It works fine the 1st time but fails on every successive attempt. On the 2nd attempt the screen goes black for a second or two and then it comes back with the errors shown below. I tried reset(gpuDevice) figuring I need to clear out the data from the last calculation but that just gives additional errors. Any idea how to fix this?

%%%the gpu_mat_mul.m code %%%

tic;

A = gpuArray(Ah);

B = gpuArray(Bh);

C = A * B;

toc

%%%the Matlab output on 1st and 2nd attempt %%%

>> Ah = rand(5000,5000);

>> Bh = rand(5000,5000);

>> run('C:\Users\mschmidt\Documents\MATLAB\gpu_mat_mul.m')

Elapsed time is 0.641242 seconds.

>> Ah = rand(5000,5000);

>> Bh = rand(5000,5000);

>> run('C:\Users\mschmidt\Documents\MATLAB\gpu_mat_mul.m')

Error using gpuArray

An unexpected error occurred during CUDA execution. The CUDA error was:

unknown error

Error in gpu_mat_mul (line 4)

A = gpuArray(Ah);

Error in run (line 63)

evalin('caller', [script ';']);

%%%gpuDevice output %%%
>> gpuDevice

ans = 

    CUDADevice with properties:

                        Name: 'GeForce GTX 460'
                       Index: 1
           ComputeCapability: '2.1'
              SupportsDouble: 1
               DriverVersion: 6
              ToolkitVersion: 5
          MaxThreadsPerBlock: 1024
            MaxShmemPerBlock: 49152
          MaxThreadBlockSize: [1024 1024 64]
                 MaxGridSize: [65535 65535 65535]
                   SIMDWidth: 32
                 TotalMemory: 1.0737e+09
         MultiprocessorCount: 7
                ClockRateKHz: 1526000
                 ComputeMode: 'Default'
        GPUOverlapsTransfers: 1
      KernelExecutionTimeout: 1
            CanMapHostMemory: 1
             DeviceSupported: 1
              DeviceSelected: 1

[Matt J]

Try making C:\Users\mschmidt\Documents\MATLAB\ the current folder and then running gpu_mat_mul.m directly, i.e., not using the RUN command. See if it returns more informative error messages.

[Aravind Harikumar]

Ah = rand(5000,5000); Bh = rand(5000,5000);

A = gpuArray(Ah); B = gpuArray(Bh); C = A * B;

I was trying to do the above matrix mutiplication in GPU. It runs the first time without any problem, however, the second time I run it, I get the following error.

Error using gpuArray An unexpected error occurred during CUDA execution. The CUDA error was: CUDA_ERROR_LAUNCH_FAILED

So, I tried the following commands: 1) gpuDevice([]) and gpuDevice(0) 2) reset(0)

Now, the new error is:

Error using gpuArray An unexpected error occurred during CUDA execution. The CUDA error was: all CUDA-capable devices are busy or unavailable.

None of them seems o release the lock on the GPU.

Could you please help me?

[Liutong]

same issue with me