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Identify and Select a GPU Device

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This example shows how to usegpuDeviceto identify and select which device you want to use.

To determine how many GPU devices are available in your computer, use thegpuDeviceCountfunction.

gpuDeviceCount("available")
ans = 2

When there are multiple devices, the first is the default. You can examine its properties with thegpuDeviceTablefunction to determine if that is the one you want to use.

gpuDeviceTable
ans=2×5 tableIndex Name ComputeCapability DeviceAvailable DeviceSelected _____ _____________ _________________ _______________ ______________ 1 "TITAN RTX" "7.5" true true 2 "Quadro K620" "5.0" true false

If the first device is the device you want to use, you can proceed. To run computations on the GPU, usegpuArrayenabled functions. For more information, seeRun MATLAB Functions on a GPU.

To use another device, callgpuDevicewith the index of the other device.

gpuDevice(2)
ans = CUDADevice with properties: Name: 'Quadro K620' Index: 2 ComputeCapability: '5.0' SupportsDouble: 1 DriverVersion: 11 ToolkitVersion: 10.2000 MaxThreadsPerBlock: 1024 MaxShmemPerBlock: 49152 MaxThreadBlockSize: [1024 1024 64] MaxGridSize: [2.1475e+09 65535 65535] SIMDWidth: 32 TotalMemory: 2.1475e+09 AvailableMemory: 1.6776e+09 MultiprocessorCount: 3 ClockRateKHz: 1124000 ComputeMode: 'Default' GPUOverlapsTransfers: 1 KernelExecutionTimeout: 1 CanMapHostMemory: 1 DeviceSupported: 1 DeviceAvailable: 1 DeviceSelected: 1

See Also

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Related Topics

Parallel Computing Toolbox Documentation

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