python多进程练习

multiprocessing包是Python中的多进程管理包。
与threading.Thread类似，它可以利用multiprocessing.Process对象来创建一个进程

#coding=utf-8
import time
import multiprocessing
import os
def test_time(x,y,z):
	i=1;
	sum=0;
	while i< 10:
		sum+=x*y*z;
		x+=1;
		y+=1;
		z+=1;
		i+=1;
		time.sleep(2);
	return sum;
process={};
x=1;
y=2;
z=3;
exit_code={};
for i in range(1,11):
	mult_test = multiprocessing.Process(target=test_time,args=(x,y,z));
	mult_test.start();
	process[(x,y,z)]=mult_test;
	exit_code[(x,y,z)]=66;
	time.sleep(1);
	x+=1;
	y+=1;
	z+=1;	
while True:
	ALLDONE=0;
	time.sleep(1);
	os.system("clear");
	for key,val in process.items():
		if val.exitcode==0:
			exit_code[key]=0;
			print_str="%-20s计算结束" % str(key);
			print(print_str);
		else:
			print_str="%-20s还在计算中" % str(key);
			print(print_str);
	for value in exit_code.values():
		ALLDONE+=value;
	if ALLDONE ==0:
		os.system("clear");
		print("计算结束");
		break;