多线程提升重装/重置CVM效率

import threading
import time
from ResetCVM import *
from mysql_logic import *

exitFlag = 0

insall= SelectSQL(None,"ResetCVM",Flag=0)
#这里是通过一个sql数据集获取需要重装的CVM列表，也可以通过业务逻辑得到。

dic=dict()
#这里通过一个内存数组保存ins列表信息，并通过popitem()在每次线程任务执行完毕后自动清除。确保线程队列不会将重复实例并发执行。
for i in insall:
    dic.update({str(i[1]):str(i[5])})

start_time = time.time()

class myThread (threading.Thread):
    def __init__(self, threadID, name):
        threading.Thread.__init__(self)
        self.threadID = threadID
        self.name = name
    def run(self):
        print ("重置任务开始线程：" + self.name)
        #time.sleep(1)
        print_time(self.name, 10)
        #time.sleep(1)
        print ("重置任务退出线程：" + self.name)

def print_time(threadName, counter):
    while counter:
        if exitFlag:
            threadName.exit()
        
        while len(dic)>0:    
            ins = dic.popitem()[0]
            print (ins)
            ResetCVM(ins)
        #print ("%s: %s" % (threadName, time.ctime(time.time())))
        counter -= 1

def ResetIns():
    # 创建新线程，这里根据业务需要，自定义来控制线程数量
    thread1 = myThread(1, "Thread-1")
    # 开启新线程
    thread1.start()
    thread1.join()
    print ("退出主线程")    
    end_time = time.time()
    print("耗时: {:.2f}秒".format(end_time - start_time))