Python：进程与进程池

我不是女神ヾ 2022-09-22 15:51 225阅读 0赞

进程使用方法

#!/usr/bin/env python  
    #coding=utf-8
    
    from multiprocessing import Process;
    
    def main():
        servers = func.mysql_query('select id,host,port,username,password,tags from db_servers_mysql where is_delete=0 and monitor=1;')
    
        logger.info("check mysql controller started.")
    
        if servers:
             plist = []
             for row in servers:
                 server_id=row[0]
                 host=row[1]
                 port=row[2]
                 username=row[3]
                 password=row[4]
                 tags=row[5]
                 p = Process(target = check_mysql, args = (host,port,username,password,server_id,tags))
                 plist.append(p)
             for p in plist:
                 p.start()
             time.sleep(10)
             for p in plist:
                 p.terminate()	
             for p in plist:
                 p.join()
             
        else:
             logger.warning("check mysql: not found any servers")
    
        logger.info("check mysql controller finished.")
    
    
    if __name__=='__main__':
        main()

进程池使用方法

#!/usr/bin/env python  
    #coding=utf-8
    
    import time
    import multiprocessing
    
    
    def say(i,x):
        print '%s %s' % (i,x)
        time.sleep(1)
        return time.time()
    
    if __name__ == "__main__":
        p = multiprocessing.Pool(processes=3)
        result = []  #申明一个列表，用来存放各进程返回的结果
        for i in range(6):
            x = 'hello'
            result.append(p.apply_async(say, (x,i,)))  #将返回结果append到列表中
        p.close()
        time.sleep(3)
        p.terminate()
        p.join()  #调用join之前，先调用close函数，否则会出错。执行完close后不会有新的进程加入到pool,join函数等待所有子进程结束
        for res in result:       #循环读出列表返回的结果
            print ":::",res.get()