import psutil
import time

LOG_FILE = 'usage.log'
INTERVAL = 5  # seconds

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