"""Collect host metrics on a run without torch.

``launchhelm.system.start`` runs a daemon thread sampling CPU, memory,
disk and network rates plus per-GPU telemetry when NVML is present. It
never blocks logging; missing psutil/NVML logs one info line and a status
label instead of failing.

Requires ``pip install "launchhelm[system]"``.

    python system_metrics.py
"""

import time

import launchhelm
import launchhelm.system

with launchhelm.init("quickstart", name="system-demo") as run:
    launchhelm.system.start(run, interval=2.0)
    for step in range(8):
        run.log({"loss": 2.0 / (step + 1)}, step=step)
        time.sleep(0.5)

print("run finished:", run.run_id)