import psutil
import time

try:
    with open('usage.log', 'a') as log_file:
        while True:
            cpu_percent = psutil.cpu_percent(interval=1)
            mem = psutil.virtual_memory()
            log_entry = f"CPU: {cpu_percent}%, Memory: {mem.percent}%\n"
            log_file.write(log_entry)
            log_file.flush()
            time.sleep(4)
except KeyboardInterrupt:
    print("Monitoring stopped by user.")