如何使用psutil终止超过特定时长的闲置进程？

Hey there! Let's tweak your code to target only those idle Application.exe processes that have been running longer than your threshold. Here's a practical approach using psutil, with explanations along the way:

Step-by-Step Solution #

First, we need to define what "idle" means for your use case. For most scenarios, we can combine two checks:

• The process has been running longer than your set threshold
• The process is using minimal CPU (indicating it's not actively doing work)

Here's the revised code:

import psutil
import time

# Define your idle threshold in seconds (e.g., 3600s = 1 hour)
IDLE_THRESHOLD = 3600

# Iterate over processes, fetching only the info we need for efficiency
for proc in psutil.process_iter(['pid', 'name', 'create_time', 'cpu_percent']):
    try:
        # Match your target process name
        if 'Application.exe' in proc.info['name']:
            # Calculate how long the process has been running
            run_duration = time.time() - proc.info['create_time']
            
            # Check if it's over the threshold AND idle (low CPU usage)
            if run_duration > IDLE_THRESHOLD and proc.info['cpu_percent'] < 1:
                print(f"Terminating idle process: {proc.info['name']} (PID: {proc.info['pid']}) | Ran for {round(run_duration/3600, 1)} hours")
                proc.kill()
    except (psutil.NoSuchProcess, psutil.AccessDenied):
        # Ignore cases where the process disappears mid-check or we lack permissions
        continue

Key Details Explained #

• Efficient Process Info: By passing a list of fields to psutil.process_iter(), we avoid unnecessary system calls and speed up the iteration.
• Run Duration Calculation: proc.info['create_time'] gives the Unix timestamp when the process started. Subtract this from the current time (time.time()) to get total runtime in seconds.
• Idle Check: Using cpu_percent < 1 ensures we only target processes that aren't actively using CPU. Adjust this value if your app might use a tiny bit of CPU while idle.
• Error Handling: Processes can vanish or restrict access during iteration, so we catch common exceptions to keep the script running smoothly.

Notes for Your Use Case #

• If you strictly need to check for user inactivity (e.g., a GUI app that hasn't been clicked in hours), psutil doesn't have a built-in way to get this. On Windows, you'd need to pair it with something like pywin32 to access system-level input tracking. But for most server/background processes, the CPU+runtime check works perfectly.
• Always test first! Comment out the proc.kill() line and run the script to verify which processes it will target before letting it terminate anything.

内容的提问来源于stack exchange，提问作者Numericaly