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Python 多线程 vs 多进程,一次说清楚(附完整代码)

  • 2026-06-30 06:59:14
Python 多线程 vs 多进程,一次说清楚(附完整代码)

Python 多线程 vs 多进程,一次说清楚(附完整代码)

写了三年 Python,有没有人和我一样——每次遇到"慢"的问题,第一反应是加个 threading,跑完发现……还是这么慢。

然后搜一圈,满屏都是"GIL 锁"、"IO 密集型"、"CPU 密集型"这些词,看完更懵了。

今天就一次说清楚:什么时候用多线程,什么时候用多进程,怎么用才不翻车。


先说结论,省你时间

场景推荐方案原因
爬虫、请求接口、读写文件多线程 threadingIO 期间线程可切换,GIL 不是瓶颈
数据计算、图像处理、压缩多进程 multiprocessing绕过 GIL,真正并行
要简单、懒得管线程concurrent.futures统一接口,几行搞定
异步 IO 高并发asyncio(另说)协程,不是今天的主题

记住这张表,90% 的场景你都能做出正确选择。


为什么多线程有时候没用?聊聊 GIL

Python(CPython 实现)有个机制叫 全局解释器锁(GIL),简单说就是:同一时刻,只有一个线程能执行 Python 字节码。

所以你开了 8 个线程做 CPU 计算,其实还是一个核在跑,轮流用,反而比单线程慢(切换有开销)。

但 IO 操作(网络请求、读文件)不占 Python 字节码时间,线程等 IO 的时候会释放 GIL,让其他线程跑——所以 IO 密集型任务,多线程是有效的


多线程实战:批量下载文件

threading 手动管线程,适合理解原理:

python
import threading
import time
import urllib.request

urls = [
    "https://httpbin.org/delay/1",
    "https://httpbin.org/delay/1",
    "https://httpbin.org/delay/1",
    "https://httpbin.org/delay/1",
]

def download(url, idx):
    print(f"[线程{idx}] 开始下载 {url}")
    try:
        urllib.request.urlopen(url, timeout=10)
        print(f"[线程{idx}] 下载完成")
    except Exception as e:
        print(f"[线程{idx}] 失败: {e}")

# 单线程串行
start = time.time()
for i, url in enumerate(urls):
    download(url, i)
print(f"串行耗时: {time.time() - start:.2f}s")

# 多线程并行
start = time.time()
threads = []
for i, url in enumerate(urls):
    t = threading.Thread(target=download, args=(url, i))
    threads.append(t)
    t.start()

for t in threads:
    t.join()
print(f"多线程耗时: {time.time() - start:.2f}s")
效果对比:
  • 串行:约 4 秒(一个一个等)
  • 多线程:约 1 秒(同时发请求)

更优雅的写法:ThreadPoolExecutor

手动管 Thread 太费劲,用线程池,5 行搞定:

python
from concurrent.futures import ThreadPoolExecutor, as_completed
import urllib.request

urls = [f"https://httpbin.org/delay/1" for _ in range(8)]

def fetch(url):
    urllib.request.urlopen(url, timeout=10)
    return f"完成: {url}"

with ThreadPoolExecutor(max_workers=4) as executor:
    futures = {executor.submit(fetch, url): url for url in urls}
    for future in as_completed(futures):
        try:
            print(future.result())
        except Exception as e:
            print(f"失败: {e}")
max_workers=4

限制最大并发数,防止同时发 100 个请求把对方服务器搞挂(也防止自己被封 IP)。


多进程实战:批量数据处理

CPU 密集型任务,换 ProcessPoolExecutor

python
from concurrent.futures import ProcessPoolExecutor
import time

def heavy_compute(n):
    """模拟 CPU 密集计算:计算 n 的阶乘"""
    result = 1
    for i in range(1, n + 1):
        result *= i
    return len(str(result))  # 返回结果位数

numbers = [50000, 60000, 70000, 80000, 90000, 100000]

# 单进程
start = time.time()
results = [heavy_compute(n) for n in numbers]
print(f"单进程耗时: {time.time() - start:.2f}s, 结果: {results}")

# 多进程(必须在 if __name__ == '__main__': 块内)
if __name__ == '__main__':
    start = time.time()
    with ProcessPoolExecutor(max_workers=4) as executor:
        results = list(executor.map(heavy_compute, numbers))
    print(f"多进程耗时: {time.time() - start:.2f}s, 结果: {results}")
注意:多进程代码必须放在 if __name__ == '__main__':

,否则 Windows 上会报错(Linux/Mac 不受影响,但养成习惯)。

效果对比(4 核机器):
  • 单进程:约 8 秒
  • 多进程:约 2.5 秒

实战场景:多进程处理大 CSV 文件

python
import multiprocessing
import pandas as pd
from pathlib import Path

def process_chunk(chunk_file):
    """处理单个分块文件"""
    df = pd.read_csv(chunk_file)
    # 模拟耗时处理
    df['new_col'] = df['value'].apply(lambda x: x ** 2 + x * 3)
    result_file = chunk_file.parent / f"result_{chunk_file.name}"
    df.to_csv(result_file, index=False)
    return str(result_file)

def split_csv(filepath, chunk_size=10000):
    """将大 CSV 切分为小块"""
    df = pd.read_csv(filepath)
    chunks = []
    for i, start in enumerate(range(0, len(df), chunk_size)):
        chunk = df.iloc[start:start + chunk_size]
        chunk_file = Path(f"/tmp/chunk_{i}.csv")
        chunk.to_csv(chunk_file, index=False)
        chunks.append(chunk_file)
    return chunks

if __name__ == '__main__':
    # 切分文件
    chunks = split_csv("big_data.csv", chunk_size=10000)
    
    # 多进程处理
    with multiprocessing.Pool(processes=multiprocessing.cpu_count()) as pool:
        results = pool.map(process_chunk, chunks)
    
    print(f"处理完成,共 {len(results)} 个结果文件")
    for r in results:
        print(f"  - {r}")

进程间通信:Queue

多进程之间内存不共享,要传数据用 Queue

python
import multiprocessing
import time

def producer(queue, items):
    for item in items:
        queue.put(item)
        print(f"生产: {item}")
        time.sleep(0.1)
    queue.put(None)  # 结束信号

def consumer(queue):
    while True:
        item = queue.get()
        if item is None:
            break
        print(f"消费: {item * 2}")

if __name__ == '__main__':
    q = multiprocessing.Queue()
    data = list(range(10))
    
    p = multiprocessing.Process(target=producer, args=(q, data))
    c = multiprocessing.Process(target=consumer, args=(q,))
    
    p.start()
    c.start()
    p.join()
    c.join()

常见坑,踩过才知道

坑1:多进程的函数必须可 pickle

Lambda、嵌套函数、类方法在多进程下经常报 can't pickle 错误——把处理函数写成模块级别的普通函数就行。

坑2:线程不安全的操作

多线程写同一个变量要加锁:

python
import threading

counter = 0
lock = threading.Lock()

def increment():
    global counter
    with lock:  # 加锁保护
        counter += 1

threads = [threading.Thread(target=increment) for _ in range(1000)]
for t in threads:
    t.start()
for t in threads:
    t.join()

print(f"最终值: {counter}")  # 应该是 1000,不加锁可能小于 1000
坑3:进程数不是越多越好

进程创建有开销,任务太少开 16 个进程反而比 4 个慢。一般设 cpu_count()cpu_count() - 1 就够了。


选型决策树

任务是否涉及大量等待(网络/IO)?
├── 是 → 多线程 ThreadPoolExecutor
│        并发数建议 10~50,视接口限制
└── 否(纯 CPU 计算)→ 多进程 ProcessPoolExecutor
         进程数建议 cpu_count() 或 cpu_count()-1

总结

多线程多进程
内存共享独立
通信直接(要加锁)Queue/Pipe
GIL 影响有(CPU 任务无效)无(真并行)
适合IO 密集型CPU 密集型
启动开销较大

并发不是银弹,选对工具才是关键。IO 等待多就用线程,CPU 算得猛就用进程,高并发网络请求就上 asyncio——别乱用,乱用比串行还慢。


如果这篇帮你搞清楚了 GIL 和并发选型,点个在看 让更多人看到。有踩过的坑,评论区聊聊👇

几行代码,专注分享能用上的 Python 技巧。

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  1. CONNECT:[ UseTime:0.000638s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001065s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.008440s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.009076s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000890s ]
  6. SELECT * FROM `set` [ RunTime:0.015097s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000949s ]
  8. SELECT * FROM `article` WHERE `id` = 488963 LIMIT 1 [ RunTime:0.042877s ]
  9. UPDATE `article` SET `lasttime` = 1783128989 WHERE `id` = 488963 [ RunTime:0.017773s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.003883s ]
  11. SELECT * FROM `article` WHERE `id` < 488963 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.019866s ]
  12. SELECT * FROM `article` WHERE `id` > 488963 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.031016s ]
  13. SELECT * FROM `article` WHERE `id` < 488963 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.044603s ]
  14. SELECT * FROM `article` WHERE `id` < 488963 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.014354s ]
  15. SELECT * FROM `article` WHERE `id` < 488963 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.103297s ]
0.414566s