cudaError_t cudaSetValidDevices ( int *  device_arr,
int  len 

Sets a list of devices for CUDA execution in priority order using device_arr. The parameter len specifies the number of elements in the list. CUDA will try devices from the list sequentially until it finds one that works. If this function is not called, or if it is called with a len of 0, then CUDA will go back to its default behavior of trying devices sequentially from a default list containing all of the available CUDA devices in the system. If a specified device ID in the list does not exist, this function will return cudaErrorInvalidDevice. If len is not 0 and device_arr is NULL or if len exceeds the number of devices in the system, then cudaErrorInvalidValue is returned.

device_arr - List of devices to try
len - Number of devices in specified list
cudaSuccess, cudaErrorInvalidValue, cudaErrorInvalidDevice
Note that this function may also return error codes from previous, asynchronous launches.
See also:
cudaGetDeviceCount, cudaSetDevice, cudaGetDeviceProperties, cudaSetDeviceFlags, cudaChooseDevice

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