"""Log host/GPU headroom; stop the test server on host OOM or low RAM."""
import json
import subprocess
import time
from pathlib import Path

def kv(path):
    return {s.split()[0].rstrip(':'): int(s.split()[1]) for s in Path(path).read_text().splitlines() if len(s.split())>=2}

baseline = kv('/proc/vmstat')['oom_kill']
while True:
    mem = kv('/proc/meminfo'); vm = kv('/proc/vmstat')
    gpu = subprocess.run(['nvidia-smi','--query-gpu=memory.used,memory.total,utilization.gpu,temperature.gpu',
                          '--format=csv,noheader,nounits'],capture_output=True,text=True,timeout=10)
    low = mem['MemAvailable'] < 8*1024*1024
    oom = vm['oom_kill'] > baseline
    print(json.dumps(dict(time=time.time(),available_gib=mem['MemAvailable']/1024**2,
                          oom_kill=vm['oom_kill'],gpu=gpu.stdout.strip(),stop=low or oom)),flush=True)
    if low or oom:
        subprocess.run(['docker','stop','-t','10','qwen38-flash-6000d'],timeout=30)
        raise SystemExit('Host memory safeguard stopped server')
    time.sleep(2)