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Python multiprocessing 多进程完全指南

  • 2026-07-02 09:20:19
Python multiprocessing 多进程完全指南

一、为什么需要多进程?

Python 中由于 GIL(全局解释器锁) 的存在:

  • ✅ 多线程:适合 I/O 密集型任务

  • ❌ 多线程:无法真正并行执行 CPU 密集型任务

👉 多进程(multiprocessing) 可以:

  • 绕过 GIL

  • 利用多核 CPU

  • 实现真正的并行计算


二、multiprocessing 基础用法

1️⃣ 最简单的多进程示例

from multiprocessing import Process
import os

def task():
    print(f"进程 ID: {os.getpid()}")

if __name__ == "__main__":
    p = Process(target=task)
    p.start()
    p.join()

⚠️ Windows 必须加:

if __name__ == "__main__":

否则会导致无限递归创建进程。


三、创建多个进程

2️⃣ 启动多个进程

from multiprocessing import Process

def task(n):
    print(f"任务 {n} 执行")

if __name__ == "__main__":
    processes = []

    for i in range(4):
        p = Process(target=task, args=(i,))
        processes.append(p)
        p.start()

    for p in processes:
        p.join()

✅ 每个进程都有独立的 Python 解释器和内存空间。


四、进程池(Pool)

3️⃣ Pool 的基本使用(推荐)

from multiprocessing import Pool

def square(x):
    return x * x

if __name__ == "__main__":
    with Pool(processes=4) as pool:
        result = pool.map(square, [1, 2, 3, 4])
        print(result)

📌 常用方法:

方法

说明

map

阻塞式并行

imap

惰性迭代

apply

单个任务

apply_async

异步执行

close()

关闭池

join()

等待所有进程结束


4️⃣ apply_async 示例

def task(n):
    return n * n

if __name__ == "__main__":
    with Pool(4) as pool:
        results = []
        for i in range(5):
            res = pool.apply_async(task, (i,))
            results.append(res)

        print([r.get() for r in results])

五、进程间通信(IPC)

5️⃣ Queue(最常用)

from multiprocessing import Process, Queue

def producer(q):
    q.put("Hello from producer")

def consumer(q):
    print(q.get())

if __name__ == "__main__":
    q = Queue()
    p1 = Process(target=producer, args=(q,))
    p2 = Process(target=consumer, args=(q,))

    p1.start()
    p2.start()
    p1.join()
    p2.join()

✅ 线程安全 & 进程安全


6️⃣ Pipe(双向通信)

from multiprocessing import Process, Pipe

def send_msg(conn):
    conn.send("Hello")

if __name__ == "__main__":
    parent_conn, child_conn = Pipe()
    p = Process(target=send_msg, args=(child_conn,))
    p.start()
    print(parent_conn.recv())
    p.join()

六、共享内存

7️⃣ Value 和 Array

from multiprocessing import Process, Value, Array

def modify(n, arr):
    n.value += 1
    arr[0] = 100

if __name__ == "__main__":
    num = Value('i', 0)
    arr = Array('i', [1, 2, 3])

    p = Process(target=modify, args=(num, arr))
    p.start()
    p.join()

    print(num.value)
    print(arr[:])

📌 'i'表示 int,'d'表示 double


8️⃣ Manager(高级共享对象)

from multiprocessing import Manager, Process

def worker(d, lst):
    d["count"] = 10
    lst.append(1)

if __name__ == "__main__":
    with Manager() as manager:
        d = manager.dict()
        lst = manager.list()

        p = Process(target=worker, args=(d, lst))
        p.start()
        p.join()

        print(d)
        print(lst)

✅ 支持:

  • dict

  • list

  • Lock

  • Queue

  • Namespace


七、进程同步(锁)

9️⃣ Lock 防止竞争条件

from multiprocessing import Process, Lock

def task(lock, n):
    with lock:
        print(f"Process {n} working")

if __name__ == "__main__":
    lock = Lock()
    processes = [Process(target=task, args=(lock, i)) for i in range(3)]

    for p in processes:
        p.start()
    for p in processes:
        p.join()

八、守护进程(Daemon)

p = Process(target=task, daemon=True)
  • ✅ 主进程退出时自动结束

  • ❌ 不能 join()


九、Pool + 共享数据(注意事项)

❌ Pool 不能直接传 Value / Array

✅ 正确方式:

  • 使用 Manager

  • 使用 initializer

def init(shared_dict):
    global d
    d = shared_dict

with Pool(initializer=init, initargs=(manager.dict(),)) as pool:
    ...

十、multiprocessing 使用建议

场景

推荐方案

CPU 密集

multiprocessing.Process

批量任务

Pool.map

异步任务

apply_async

数据共享

Manager

高性能

减少 IPC


十一、一句话总结

multiprocessing 让 Python 突破 GIL,真正实现多核并行计算。

但代价是:

  • 内存占用更高

  • 通信更复杂

  • 启动成本更大


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  1. CONNECT:[ UseTime:0.000622s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000819s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.100786s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.091317s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000717s ]
  6. SELECT * FROM `set` [ RunTime:0.000565s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000615s ]
  8. SELECT * FROM `article` WHERE `id` = 497462 LIMIT 1 [ RunTime:0.028573s ]
  9. UPDATE `article` SET `lasttime` = 1783005990 WHERE `id` = 497462 [ RunTime:0.016992s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000717s ]
  11. SELECT * FROM `article` WHERE `id` < 497462 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.024713s ]
  12. SELECT * FROM `article` WHERE `id` > 497462 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.166602s ]
  13. SELECT * FROM `article` WHERE `id` < 497462 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.156850s ]
  14. SELECT * FROM `article` WHERE `id` < 497462 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.101204s ]
  15. SELECT * FROM `article` WHERE `id` < 497462 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.101165s ]
0.865611s