如何使用Python获取系统CPU和内存使用情况深度好文

import psutil

def get_cpu_memory_usage():
    # 获取CPU使用率
    cpu_percent = psutil.cpu_percent(interval=1)

    # 获取内存使用情况
    memory_info = psutil.virtual_memory()
    memory_percent = memory_info.percent

    return cpu_percent, memory_percent

if __name__ == "__main__":
    try:
        cpu, memory = get_cpu_memory_usage()
        print(f"CPU Usage: {cpu}%")
        print(f"Memory Usage: {memory}%")
    except Exception as e:
        print(f"An error occurred: {e}")

def get_cpu_memory_usage_from_proc():
    # 获取CPU使用率
    with open('/proc/stat', 'r') as f:
        lines = f.readlines()
        for line in lines:
            if line.startswith('cpu '):
                cpu_stats = [int(x) for x in line.split()[1:]]
                total_idle = cpu_stats[3] + cpu_stats[4]
                total = sum(cpu_stats)
                break
        cpu_percent = (total - total_idle) / total * 100

    # 获取内存使用情况
    with open('/proc/meminfo', 'r') as f:
        meminfo = dict((i.split()[0].rstrip(':'), int(i.split()[1])) for i in f.readlines())
        total_mem = meminfo['MemTotal']
        free_mem = meminfo['MemFree'] + meminfo['Buffers'] + meminfo['Cached']
        memory_percent = (total_mem - free_mem) / total_mem * 100

    return cpu_percent, memory_percent

if __name__ == "__main__":
    try:
        cpu, memory = get_cpu_memory_usage_from_proc()
        print(f"CPU Usage: {cpu:.2f}%")
        print(f"Memory Usage: {memory:.2f}%")
    except Exception as e:
        print(f"An error occurred: {e}")

def safe_get_cpu_memory_usage():
    try:
        return get_cpu_memory_usage()
    except Exception as e:
        print(f"Error using psutil: {e}")
        try:
            return get_cpu_memory_usage_from_proc()
        except Exception as e:
            print(f"Error reading from /proc: {e}")
            return None, None

if __name__ == "__main__":
    cpu, memory = safe_get_cpu_memory_usage()
    if cpu is not None and memory is not None:
        print(f"CPU Usage: {cpu}%")
        print(f"Memory Usage: {memory}%")
    else:
        print("Failed to retrieve CPU and memory usage.")

import time
import sqlite3

def store_cpu_memory_usage(cpu, memory):
    conn = sqlite3.connect('system_monitor.db')
    c = conn.cursor()
    c.execute('''CREATE TABLE IF NOT EXISTS system_usage
                 (timestamp TEXT, cpu REAL, memory REAL)''')
    c.execute("INSERT INTO system_usage (timestamp, cpu, memory) VALUES (?, ?, ?)",
              (time.strftime('%Y-%m-%d %H:%M:%S'), cpu, memory))
    conn.commit()
    conn.close()

def monitor_system():
    while True:
        cpu, memory = safe_get_cpu_memory_usage()
        if cpu is not None and memory is not None:
            store_cpu_memory_usage(cpu, memory)
        time.sleep(60)  # 每分钟采集一次数据

if __name__ == "__main__":
    monitor_system()