import ray
ray.init(address='auto')

@ray.remote(num_cpus=0.01)
def check_gpu():
    import subprocess, socket
    hostname = socket.gethostname()
    result = subprocess.run(
        "nvidia-smi --query-gpu=memory.used,memory.total --format=csv,noheader",
        shell=True, capture_output=True, text=True
    )
    return f"{hostname}:\n{result.stdout}"

nodes = [n for n in ray.nodes() if n['Alive']]
futures = [check_gpu.remote() for _ in range(len(nodes) * 2)]
for r in set(ray.get(futures)):
    print(r)