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這篇文章主要介紹了Python如何實現的自定義多線程多進程類示例,具有一定借鑒價值,感興趣的朋友可以參考下,希望大家閱讀完這篇文章之后大有收獲,下面讓小編帶著大家一起了解一下。
最近經常使用到對大量文件進行操作的程序以前每次寫的時候都要在函數中再寫一個多線程多進程的函數,做了些重復的工作遇到新的任務時還要重寫,因此將多線程與多進程的一些簡單功能寫成一個類,方便使用。功能簡單只為以后方便使用。
使用中發現bug會再進行更新
#!/usr/bin/env python # -*- coding: utf-8 -*- # @Time : 2017/5/10 12:47 # @Author : zhaowen.zhu # @Site : # @File : MultiThread.py # @Software: Python Idle import threading,time,sys,multiprocessing from multiprocessing import Pool class MyTMultithread(threading.Thread): ''''' 自定義的線程函數, 功能:使用多線程運行函數,函數的參數只有一個file,并且未實現結果值的返回 args: filelist 函數的參數為列表格式, funname 函數的名字為字符串,函數僅有一個參數為file delay 每個線程之間的延遲, max_threads 線程的最大值 ''' def __init__(self,filelist,delay,funname,max_threads = 50): threading.Thread.__init__(self) self.funname = funname self.filelist = filelist[:] self.delay = delay self.max_threads = max_threads def startrun(self): def runs(): time.sleep(self.delay) while True: try: file = self.filelist.pop() except IndexError as e: break else: self.funname(file) threads = [] while threads or self.filelist: for thread in threads: if not thread.is_alive(): threads.remove(thread) while len(threads) < self.max_threads and self.filelist: thread = threading.Thread(target = runs) thread.setDaemon(True) thread.start() threads.append(thread) class Mymultiprocessing (MyTMultithread): ''''' 多進程運行函數,多進程多線程運行函數 args: filelist 函數的參數為列表格式, funname 函數的名字為字符串,函數僅有一個參數為file delay 每個線程\進程之間的延遲, max_threads 最大的線程數 max_multiprocess 最大的進程數 ''' def __init__(self,filelist,delay,funname,max_multiprocess = 1,max_threads = 1): self.funname = funname self.filelist = filelist[:] self.delay = delay self.max_threads = max_threads self.max_multiprocess = max_multiprocess self.num_cpus = multiprocessing.cpu_count() def multiprocessingOnly(self): ''''' 只使用多進程 ''' num_process = min(self.num_cpus,self.max_multiprocess) processes = [] while processes or self.filelist: for p in processes: if not p.is_alive(): # print(p.pid,p.name,len(self.filelist)) processes.remove(p) while len(processes) < num_process and self.filelist: try: file = self.filelist.pop() except IndexError as e: break else: p = multiprocessing.Process(target=self.funname,args=(file,)) p.start() processes.append(p) def multiprocessingThreads(self): num_process = min(self.num_cpus,self.max_multiprocess) p = Pool(num_process) DATALISTS = [] tempmod = len(self.filelist) % (num_process) CD = int((len(self.filelist) + 1 + tempmod)/ (num_process)) for i in range(num_process): if i == num_process: DATALISTS.append(self.filelist[i*CD:-1]) DATALISTS.append(self.filelist[(i*CD):((i+1)*CD)]) try: processes = [] for i in range(num_process): #print('wait add process:',i+1,time.clock()) #print(eval(self.funname),DATALISTS[i]) MultThread = MyTMultithread(DATALISTS[i],self.delay,self.funname,self.max_threads) p = multiprocessing.Process(target=MultThread.startrun()) #print('pid & name:',p.pid,p.name) processes.append(p) for p in processes: print('wait join ') p.start() print('waite over') except Exception as e: print('error :',e) print ('end process') def func1(file): print(file) if __name__ == '__main__': a = list(range(0,97)) ''''' 測試使用5線程 ''' st = time.clock() asc = MyTMultithread(a,0,'func1',5) asc.startrun() end = time.clock() print('*'*50) print('多線程使用時間:',end-st) #測試使用5個進程 st = time.clock() asd = Mymultiprocessing(a,0,'func1',5) asd.multiprocessingOnly() end = time.clock() print('*'*50) print('多進程使用時間:',end-st) #測試使用5進程10線程 st = time.clock() multiPT = Mymultiprocessing(a,0,'func1',5,10) multiPT.multiprocessingThreads() end = time.clock() print('*'*50) print('多進程多線程使用時間:',end-st)
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