getGpuId: Discover the Id of the current GPU device
Description
Queries the CUDA driver for the GPU device currently assigned to this
thread. This is the id of the device that will be used for computation.
If you wish to use a different device, use the chooseGpu function.
Usage
getGpuId()
Arguments
Value
The function returns a single integer indicating the id of the
GPU device currently selected to carry out computation according to the
CUDA driver.