Query or select GPU device
D = gpuDevice
D = gpuDevice()
D = gpuDevice(IDX)
gpuDevice([])
D = gpuDevice or D = gpuDevice(),
if no device is already selected, selects the default GPU device and
returns a GPUDevice object
representing that device. If a GPU device is already selected, this
returns an object representing that device without clearing it.
D = gpuDevice(IDX) selects the GPU device
specified by index IDX. IDX must
be in the range of 1 to gpuDeviceCount. A warning
or error might occur if the specified GPU device is not supported.
This form of the command with a specified index resets the device
and clears its memory (even if this device is already currently selected,
equivalent to reset); so all
workspace variables representing gpuArray or CUDAKernel variables
are now invalid, and you should clear them from the workspace or redefine
them.
gpuDevice([]), with an empty argument (as
opposed to no argument), deselects the GPU device and clears its memory
of gpuArray and CUDAKernel variables. This leaves no GPU device selected
as the current device.
Create an object representing the default GPU device.
g = gpuDevice;
Query the compute capabilities of all available GPU devices.
for ii = 1:gpuDeviceCount g = gpuDevice(ii); fprintf(1,'Device %i has ComputeCapability %s \n', ... g.Index,g.ComputeCapability) end
Device 1 has ComputeCapability 3.5 Device 2 has ComputeCapability 2.0
arrayfun | feval | gpuDeviceCount | parallel.gpu.CUDAKernel | reset | wait (GPUDevice)