python多线程

ps：对cpu架构实现原理理解不深。暂时可以通过代码测试不同方法的性能。后续分析

有待学习：cpu、多核、io（多线程、多进程，多核cpu利用率）等的架构

python多线程和多进程编程(进程间通信)

1、加线程锁只有一个cpu占用率高90%+

#!/usr/bin/env python 
  
import thread 
from time import sleep, ctime 

  
loops = [100, 100] 
  
def loop(nloop, nsec, lock):
    while 1：
        pass
    lock.release() 

def main(): 
  print '---starting threads...'
  locks = [] 
  nloops = range(len(loops)) 
  
  for i in nloops: 
    lock = thread.allocate_lock() 
    lock.acquire() 
    locks.append(lock) 
  
  for i in nloops: 
    thread.start_new_thread(loop,  
      (i, loops[i], locks[i])) 
  
  for i in nloops: 
    while locks[i].locked(): pass
  
  print '---all DONE at:', ctime() 
  
if __name__ == '__main__': 
  main() 

2、不加线程锁  开启一个进程，一个cpu占用率相当 20%  用到sshd服务

#!/usr/bin/env python 
  
import thread 
from time import sleep, ctime 
  
def loop0(): 
    while 1:
        print '+++start loop 0 at:', ctime() 
  
def loop1(): 
    while 1:
        print '***start loop 1 at:', ctime() 

  
def main(): 
  print '------starting at:', ctime() 
  thread.start_new_thread(loop0, ()) 
  thread.start_new_thread(loop1, ()) 
  sleep(200) 
  print '------all DONE at:', ctime() 
  
if __name__ == '__main__': 
  main()