reset

Reset GPU device and clear its memory

Syntax

reset(gpudev)

Description

reset(gpudev) resets the GPU device and clears its memory of gpuArray and CUDAKernel data. The GPU device identified by gpudev remains the selected device, but all gpuArray and CUDAKernel objects in MATLAB representing data on that device are invalid.

Examples

Reset GPU Device

Create a gpuArray on the selected GPU device.

g = gpuDevice(1);
M = gpuArray(magic(4));
M  % Display gpuArray

    16     2     3    13
     5    11    10     8
     9     7     6    12
     4    14    15     1

Reset the device.

reset(g);
g   % Show that the device is still selected

g =

  CUDADevice with properties:

                      Name: 'Tesla K20c'
                     Index: 1
         ComputeCapability: '3.5'
            SupportsDouble: 1
             DriverVersion: 7.5
            ToolkitVersion: 7.5
        MaxThreadsPerBlock: 1024
          MaxShmemPerBlock: 49152
        MaxThreadBlockSize: [1024 1024 64]
               MaxGridSize: [2.1475e+09 65535 65535]
                 SIMDWidth: 32
               TotalMemory: 5.0327e+09
           AvailableMemory: 4.9190e+09
       MultiprocessorCount: 13
              ClockRateKHz: 705500
               ComputeMode: 'Default'
      GPUOverlapsTransfers: 1
    KernelExecutionTimeout: 0
          CanMapHostMemory: 1
           DeviceSupported: 1
            DeviceSelected: 1

Show that the gpuArray variable name is still in the MATLAB workspace

whos

  Name      Size      Bytes  Class
  g         1x1         112  parallel.gpu.CUDADevice
  M         1x1         108  gpuArray

Try to display the gpuArray.

M

Data no longer exists on the GPU.

Clear the variable.

clear M

Input Arguments

gpudev — GPU device

GPU device

GPU device, specified as a GPUDevice object that represents the currently selected device

Tips

After you reset a GPU device, any variables representing arrays or kernels on the device are invalid; you should clear or redefine them.