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How to Monitor Process RSS Memory in Python

Poll the VmRSS field from /proc/PID/status to watch a process's resident memory and alert on growth.

import os
import time
import subprocess
import sys

def get_rss_mb(pid):
    """Return RSS memory in MB for a given process ID."""
    try:
        with open(f"/proc/{pid}/status", "r") as f:
            for line in f:
                if line.startswith("VmRSS:"):
                    return int(line.split()[1]) / 1024…

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