Error using gpuArray MATLAB tried to use GPU device 1, but the device is busy or unavailable.

I am fairly new to the GPU stuff. I executed the following code

N = 6;
M = magic(N);
G = gpuArray(M);

and the error:

Error using gpuArray MATLAB tried to use GPU device 1, but the device is busy or unavailable.

pops up.

When I use gpuDevice to know about CUDA properties this is what I see.

ans = 

    CUDADevice with properties:

                        Name: 'GeForce 940M'
                       Index: 1
           ComputeCapability: '5.0'
              SupportsDouble: 1
               DriverVersion: 8
              ToolkitVersion: 5
          MaxThreadsPerBlock: 1024
            MaxShmemPerBlock: 49152
          MaxThreadBlockSize: [1024 1024 64]
                 MaxGridSize: [2.1475e+09 65535 65535]
                   SIMDWidth: 32
                 TotalMemory: 2.1475e+09
                  FreeMemory: NaN
         MultiprocessorCount: 3
                ClockRateKHz: 1176000
                 ComputeMode: 'Default'
        GPUOverlapsTransfers: 1
      KernelExecutionTimeout: 1
            CanMapHostMemory: 1
             DeviceSupported: 1
              DeviceSelected: 0

I wonder why is this happening. I saw few answers saying the DeviceSelected must be 1, but its zero in my case. Am using matlab R2013a. Can any one let me know how to enable it and make it 1 and also why this error is popping up. Any help is appreciated. Thanks in Advance.

[Joss Knight]

What is the output of

!nvidia-smi

[Heath]

I have the same issue as OP (although with a different GPU). When I run nvidia-smi, I get the following:

    %
C:\Program Files\NVIDIA Corporation\NVSMI>nvidia-smi
Fri May 13 11:09:12 2016
+------------------------------------------------------+
| NVIDIA-SMI 364.72     Driver Version: 364.72         |
|-------------------------------+----------------------+----------------------+
| GPU  Name            TCC/WDDM | Bus-Id        Disp.A | Volatile Uncorr. ECC |
| Fan  Temp  Perf  Pwr:Usage/Cap|         Memory-Usage | GPU-Util  Compute M. |
|===============================+======================+======================|
|   0  GeForce GT 750M    WDDM  | 0000:02:00.0     N/A |                  N/A |
| N/A   58C    P8    N/A /  N/A |     56MiB /  2048MiB |     N/A      Default |
+-------------------------------+----------------------+----------------------+
+-----------------------------------------------------------------------------+
| Processes:                                                       GPU Memory |
|  GPU       PID  Type  Process name                               Usage      |
|=============================================================================|
|    0                  Not Supported                                         |
+-----------------------------------------------------------------------------+

Answer 1

[zgjj]

I've solved this problem by updating my GPU driver. Maybe you can try the same way.