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Python进阶:1 并行计算-多线程(2)

  • 2026-02-28 03:32:11
Python进阶:1 并行计算-多线程(2)

上节讲了一下Python中的多线程,并做了演示。但肯定有小伙伴对线程的并发有疑惑,因为很多教程都说Python的线程没有并发能力。事实是这样吗?认真看了上节课程的小伙伴肯定注意到,它有并发能力。但为什么说没有呢,这就要来讲讲Python的锁。

首先,要说明一点。在Python的线程这里,有两把锁,分别是GIL锁和Lock锁。它们的功能和定位是不同的,很多人会在这个地方弄混,所以在使用线程时没发很好的利用线程并发。

P 1、GIL锁

GIL锁是Python解释器级别的,是用于控制解释器对多线程进行串行计算的锁。也就是说,它的存在在解释器中,将多个线程的字节码逐个进行计算,因为每个线程的计算时间短,所以才会有并发的感觉。下面是一个放慢的动画演示:

这个动画展示了Python中GIL锁的运行逻辑,当然CPU速度是很快的,所以我们感觉不到。

P 2、Lock锁

Lock是进程内部,控制各个线程关于某个资源共享的锁。就是说进程内部有个共享的资源,多个线程都可以访问,但为了避免冲突,当线程访问它时,先加锁来防止其它线程访问,当访问结束后,在解锁给其他线程访问。下面是三个线程轮流加锁访问变量的过程。

Lock锁的代码演示:

import timeimport threadinglock = threading.Lock()count = 0# 任务函数def myfunc(name):    t0 = time.time()    print(f' Thread {name} : Start')    time.sleep(2)    global count,lock    lock.acquire()    # 加锁    count+=1    lock.release()    # 解锁    print(f' Thread {name} : {count=}')    print(f' Thread {name} : End. Time={time.time()-t0}')print('Thread test :Start')t0 = time.time()th = []for i in range(3):    # 创建线程    obj = threading.Thread(target=myfunc,args=(i,))    th.append(obj)for i in range(3):    # 启动线程    th[i].start()for i in range(3):    # 等待线程结束,此时对线程的join()方法可以运行,但其余的代码不可执行。    th[i].join()print(f'Thread test: End. Time={time.time()-t0}')

运行效果,如下:

Thread test : Start  Thread 0 : Start  Thread 1 : Start  Thread 2 : Start  Thread 0 : count=1  Thread 1 : count=2  Thread 1 : End. Time=2.0012946128845215  Thread 2 : count=3  Thread 2 : End. Time=2.001281976699829  Thread 0 : End. Time=2.002289295196533Thread test : End. Time=2.004284620285034

可以看到,线程0和线程1实际上存在打印变量的冲突,导致其数据的数据在同一行。打印前已经释放Lock锁了,所以打印出现了冲突。将myfunc函数代码做一下修改,就可以解决这个问题。如下:

# 任务函数def myfunc(name):    t0 = time.time()    print(f' Thread {name} : Start')    time.sleep(2)    global count,lock    lock.acquire()    # 加锁    count+=1    print(f' Thread {name} : {count=}')    lock.release()    # 解锁    print(f' Thread {name} : End. Time={time.time()-t0}')

再次运行测试代码,效果如下:

Thread test : Start  Thread 0 : Start  Thread 1 : Start  Thread 2 : Start  Thread 2 : count=1  Thread 2 : End. Time=2.002711296081543  Thread 1 : count=2  Thread 1 : End. Time=2.002711296081543  Thread 0 : count=3  Thread 0 : End. Time=2.0037083625793457Thread test : End. Time=2.005704402923584

这里要注意,Lock会造成其它线程等待资源占用,如果将过多的非数据访问操作放到加锁和解锁之间的代码,将会造成资源浪费(表现为闲置等待)。小伙伴可以尝试将上面的time.sleep(2)放到锁里看看,答案是运行时间会变成6s以上,是不是并行变串行了。

 End 转角  ·  遇见  ·  程序猿
-------------------------
那是一抹淡淡的微光

它是数字世界里的一把杀猪刀

却总能巧夺天工

它的世界是纯粹0、1组合

却总能创造无尽幻想

......

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  1. CONNECT:[ UseTime:0.000696s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000877s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000340s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000268s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000649s ]
  6. SELECT * FROM `set` [ RunTime:0.000238s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000700s ]
  8. SELECT * FROM `article` WHERE `id` = 476418 LIMIT 1 [ RunTime:0.000568s ]
  9. UPDATE `article` SET `lasttime` = 1772253687 WHERE `id` = 476418 [ RunTime:0.024001s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000315s ]
  11. SELECT * FROM `article` WHERE `id` < 476418 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000505s ]
  12. SELECT * FROM `article` WHERE `id` > 476418 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000411s ]
  13. SELECT * FROM `article` WHERE `id` < 476418 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000651s ]
  14. SELECT * FROM `article` WHERE `id` < 476418 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.003012s ]
  15. SELECT * FROM `article` WHERE `id` < 476418 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.011957s ]
0.120979s