As $UID, run the commands

export CUDA_VISIBLE_DEVICES=0 # Select GPU 0.

export CUDA_MPS_PIPE_DIRECTORY=/tmp/nvidia-mps # Select a location that’s accessible to the given $UID

export CUDA_MPS_LOG_DIRECTORY=/tmp/nvidia-log # Select a location that’s accessible to the given $UID

nvidia-cuda-mps-control -d # Start the daemon.

This will start the MPS control daemon that will spawn a new MPS Server instance for that $UID starting an application and associate it with GPU visible to the control daemon.