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Python进阶:2 并行计算-多进程(2)

  • 2026-02-26 00:56:09
Python进阶:2 并行计算-多进程(2)
上节讲了多进程的启动方式,以及如何创建一个多进程程序。本节来聊一聊进程间如何传递参数,也叫进程间通信。

P 3、进程间通信

(1)Lock锁通信

Lock锁的通信和多线程类似,但它不能用于全局变量,因为进程间内存是独立的,会生成各自的命名空间。某种意义上讲,在多进程中它是无效的。为什么这么说,因为它可以利用multiprocessing.Value()实现变量资源共享。但它不是进程通信的主要方式,所以这里就不多做说明了。

2Queue队列通信

队列通信是比较常用的进程间通信方式,它利用multiprocessing.Queue()方法实现。

案例展示,如下:

defmyfunc(name,q):    t0 = time.time()    print(f' Process {name} : Start')    time.sleep(2)    q.put(f'  Process {name} sleep 2 seconds.')   # 任务函数将数据推送到队列中    print(f' Process {name} : End. Time={time.time()-t0}')if __name__=='__main__':    print('Process test : Start')    t0 = time.time()    q = multiprocessing.Queue()    # 创建队列    proc = []    for i inrange(3):        # 创建进程        obj = multiprocessing.Process(target=myfunc,args=(i,q))    # 队列通过参数传递给任务函数        proc.append(obj)    for i inrange(3):        # 启动进程        proc[i].start()    for i inrange(3):        print(q.get())   # 主函数将子进程的数据读取出来。    for i inrange(3):        # 等待进程结束,此时对进程的join()方法可以运行,但其余的代码不可执行。        proc[i].join()    print(f'Process test : End.Time={time.time()-t0}')

运行效果,如下:

Process test : Start  Process0 : Start  Process1 : Start  Process2 : Start  Process0 : End. Time=2.0036540031433105  Process0 sleep 2 seconds.  Process1 : End. Time=2.0014002323150635  Process1 sleep 2 seconds.  Process2 : End. Time=2.0017902851104736  Process2 sleep 2 seconds.Process test : End.Time=2.3170416355133057

3Pipe管道通信

管道和队列的通信方式比较相似,但有区别。因为管道是创建两个端口,这样就可以一个进一个出双向通信。而队列是每个进程都可以向队列中发送消息,也都可以读取数据,是一种多入多出的通信方式。

案例展示,如下:

def myfunc(name,pipe):    t0 = time.time()    print(f' Process {name} : Start')    time.sleep(2)    pipe.send(f'  Process {name} sleep 2 seconds.')    print(f' Process {name} : End. Time={time.time()-t0}')if __name__=='__main__':    print('Process test : Start')    p0,p1 = multiprocessing.Pipe()    t0 = time.time()    proc = []    for i in range(3):        # 创建进程        obj = multiprocessing.Process(target=myfunc,args=(i,p1))        proc.append(obj)    for i in range(3):        # 启动进程        proc[i].start()        print(p0.recv())    for i in range(3):        # 等待进程结束,此时对进程的join()方法可以运行,但其余的代码不可执行。        proc[i].join()    print(f'Process test : End.Time={time.time()-t0}')

运行效果,如下:

Process test : Start  Process0 : Start  Process1 : Start  Process2 : Start  Process0 : End. Time=2.000847816467285  Process0 sleep 2 seconds.  Process1 : End. Time=2.000988721847534  Process1 sleep 2 seconds.  Process2 : End. Time=2.001150608062744  Process2 sleep 2 seconds.Process test : End.Time=2.241823673248291

上面是单向消息,实际上管道可以双向传递,如下:

defmyfunc(name,pipe):    t0 = time.time()    print(f' Process {name} : Start')    time.sleep(2)    pipe.send(f'  Process {name} sleep 2 seconds.')   # 发送消息    print(f'  Process {name} : {pipe.recv()}')   # 接收消息    print(f' Process {name} : End. Time={time.time()-t0}')if __name__=='__main__':    print('Process test : Start')    p0,p1 = multiprocessing.Pipe()    t0 = time.time()    proc = []    for i inrange(3):        # 创建进程        obj = multiprocessing.Process(target=myfunc,args=(i,p1))        proc.append(obj)    for i inrange(3):        # 启动进程        proc[i].start()    for i in ['Tom','Lex','Rose']:        print(p0.recv())   # 接收消息        p0.send(i)   # 发送消息    for i inrange(3):        # 等待进程结束,此时对进程的join()方法可以运行,但其余的代码不可执行。        proc[i].join()    print(f'Process test : End.Time={time.time()-t0}')
运行效果,如下:
Process test : Start  Process0 : Start  Process1 : Start  Process2 : Start  Process0 sleep 2 seconds.  Process0 : Tom  Process0 : End. Time=2.0024027824401855  Process1 sleep 2 seconds.  Process1 : Lex  Process1 : End. Time=2.0031163692474365  Process2 sleep 2 seconds.  Process2 : Rose  Process2 : End. Time=2.001136541366577Process test : End.Time=2.2119128704071045

通过上述的QueuePipe两种方式都可以实现消息传递,但并没有做消息校验,这在实际编程中是要不得的,可能造成一定的混乱。所以实际编程时,一定要在使用消息前,做消息校验。

 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:0.000911s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001372s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.019368s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.001839s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001552s ]
  6. SELECT * FROM `set` [ RunTime:0.000731s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001650s ]
  8. SELECT * FROM `article` WHERE `id` = 476680 LIMIT 1 [ RunTime:0.017635s ]
  9. UPDATE `article` SET `lasttime` = 1772247086 WHERE `id` = 476680 [ RunTime:0.006063s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000872s ]
  11. SELECT * FROM `article` WHERE `id` < 476680 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.016307s ]
  12. SELECT * FROM `article` WHERE `id` > 476680 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.019779s ]
  13. SELECT * FROM `article` WHERE `id` < 476680 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.132883s ]
  14. SELECT * FROM `article` WHERE `id` < 476680 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.118298s ]
  15. SELECT * FROM `article` WHERE `id` < 476680 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.078615s ]
0.598018s