You can modify the run-time behaviour by setting environment variables:
Controls the output of the library. By default nothing is printed on stdout. Set this to all to see debug output.
Colon-separated list of paths in which plugin manager looks for additional task modules. The plugins are load with descending priority.
Controls which OpenCL devices should be used. It works similar to the CUDA_VISIBLE_DEVICES environment variables, i.e. set it to 0,2 to choose the first and third device that’s available.
Controls which OpenCL device types should be considered for execution. The variable is a comma-separated list with strings being cpu, gpu and acc, i.e. to use both CPU and GPUs set UFO_DEVICE_TYPE=”cpu,gpu”.