如何用Python监控服务器资源？psutil获取CPU内存使用率

import psutil
import time

def get_cpu_usage():
    """获取CPU使用率"""
    return psutil.cpu_percent(interval=1) # interval=1 表示每秒采样一次

def get_memory_usage():
    """获取内存使用率"""
    memory = psutil.virtual_memory()
    return memory.percent

def main():
    try:
        while True:
            cpu_usage = get_cpu_usage()
            memory_usage = get_memory_usage()
            print(f"CPU 使用率: {cpu_usage}%")
            print(f"内存 使用率: {memory_usage}%")
            time.sleep(2)  # 每隔2秒更新一次
    except KeyboardInterrupt:
        print("监控已停止")

if __name__ == "__main__":
    main()

import psutil
import time

def get_average_cpu_usage(interval=5):
    """获取一段时间内的平均CPU使用率"""
    cpu_usage_before = psutil.cpu_times()
    time.sleep(interval)
    cpu_usage_after = psutil.cpu_times()

    idle_diff = cpu_usage_after.idle - cpu_usage_before.idle
    total_diff = sum(cpu_usage_after) - sum(cpu_usage_before)

    cpu_usage = 100.0 * (total_diff - idle_diff) / total_diff if total_diff > 0 else 0.0
    return cpu_usage

# ... (省略 main 函数中的其他部分)

import psutil
import time

def get_process_cpu_memory(pid):
    """获取指定进程的CPU和内存使用率"""
    try:
        process = psutil.Process(pid)
        cpu_usage = process.cpu_percent(interval=1)
        memory_usage = process.memory_percent()
        return cpu_usage, memory_usage
    except psutil.NoSuchProcess:
        return None, None

def main():
    pid = 1234 # 替换成你要监控的进程的PID
    try:
        while True:
            cpu_usage, memory_usage = get_process_cpu_memory(pid)
            if cpu_usage is not None and memory_usage is not None:
                print(f"进程 {pid} CPU 使用率: {cpu_usage}%")
                print(f"进程 {pid} 内存 使用率: {memory_usage}%")
            else:
                print(f"进程 {pid} 不存在")
            time.sleep(2)
    except KeyboardInterrupt:
        print("监控已停止")

if __name__ == "__main__":
    main()

import psutil
import time
import matplotlib.pyplot as plt

def main():
    cpu_usage_history = []
    memory_usage_history = []
    timestamp_history = []

    try:
        while True:
            cpu_usage = psutil.cpu_percent(interval=1)
            memory_usage = psutil.virtual_memory().percent
            cpu_usage_history.append(cpu_usage)
            memory_usage_history.append(memory_usage)
            timestamp_history.append(time.strftime("%H:%M:%S")) # 记录时间戳

            # 只保留最近60个数据点
            if len(cpu_usage_history) > 60:
                cpu_usage_history.pop(0)
                memory_usage_history.pop(0)
                timestamp_history.pop(0)

            # 绘制图表
            plt.clf() # 清除当前图形
            plt.plot(timestamp_history, cpu_usage_history, label="CPU Usage")
            plt.plot(timestamp_history, memory_usage_history, label="Memory Usage")
            plt.xlabel("Time")
            plt.ylabel("Usage (%)")
            plt.title("CPU and Memory Usage")
            plt.legend()
            plt.xticks(rotation=45, ha="right") # 旋转x轴标签，使其更易读
            plt.tight_layout() # 自动调整子图参数，使其填充整个图像区域
            plt.pause(0.1) # 暂停0.1秒，更新图表

    except KeyboardInterrupt:
        print("监控已停止")
        plt.show() # 显示最终图表

if __name__ == "__main__":
    main()

import psutil
import time
import smtplib
from email.mime.text import MIMEText

def send_email(subject, body, sender_email, sender_password, receiver_email):
    """发送邮件"""
    message = MIMEText(body)
    message['Subject'] = subject
    message['From'] = sender_email
    message['To'] = receiver_email

    try:
        with smtplib.SMTP_SSL('smtp.gmail.com', 465) as server: # 使用 Gmail SMTP 服务器
            server.login(sender_email, sender_password)
            server.sendmail(sender_email, receiver_email, message.as_string())
        print("邮件发送成功")
    except Exception as e:
        print(f"邮件发送失败: {e}")

def main():
    cpu_threshold = 80  # CPU 使用率阈值
    memory_threshold = 90 # 内存使用率阈值
    sender_email = "your_email@gmail.com" # 你的邮箱
    sender_password = "your_password" # 你的邮箱密码或应用专用密码
    receiver_email = "recipient_email@example.com" # 接收告警的邮箱

    try:
        while True:
            cpu_usage = psutil.cpu_percent(interval=1)
            memory_usage = psutil.virtual_memory().percent

            if cpu_usage > cpu_threshold:
                subject = "CPU 使用率告警"
                body = f"CPU 使用率已超过阈值 ({cpu_threshold}%): {cpu_usage}%"
                send_email(subject, body, sender_email, sender_password, receiver_email)

            if memory_usage > memory_threshold:
                subject = "内存 使用率告警"
                body = f"内存 使用率已超过阈值 ({memory_threshold}%): {memory_usage}%"
                send_email(subject, body, sender_email, sender_password, receiver_email)

            time.sleep(60)  # 每隔60秒检查一次
    except KeyboardInterrupt:
        print("监控已停止")

if __name__ == "__main__":
    main()