中财网书法作品如何书写落款:python共享内存测试
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python共享内存测试时间:2010-07-23 19:39:13来源:网络 作者:未知 点击:36次
python的multiprocessing模块提供两种共享内存，sharedctypes与Manager，
Manager效率较低，但支持远程共享内存。
sharedctypes效率较高，快Manager两个数量级，在多进程访问时与普通内存访问相当python的multiprocessing模块提供两种共享内存，sharedctypes与Manager，
Manager效率较低，但支持远程共享内存。
sharedctypes效率较高，快Manager两个数量级，在多进程访问时与普通内存访问相当
结果比较如下：
test array
elapsed 0:00:00.119707
test dict
elapsed 0:00:00.152856
test shared manager list
elapsed 0:00:37.87666
test sharedctypes list in main process
elapsed 0:00:00.154170
test sharedctypes list in subprocess
elapsed 0:00:00.303328
elapsed 0:00:00.327261
elapsed 0:00:00.349312
elapsed 0:00:00.318946
elapsed 0:00:00.364301
elapsed 0:00:00.370176
elapsed 0:00:00.343588
elapsed 0:00:00.348737
代码如下：
import array
from datetime import datetime, timedeltasize = 1000000
def tranverse(a):
t = datetime.now()
for i in range(size):
a[i]
print 'elapsed %s'% (datetime.now()- t)a = array.array('i', [i for i in range(size)])
print 'test array'
tranverse(a)
a = {}
for i in range(size):
a[i] = i
print 'test dict'
tranverse(a)
from multiprocessing import Manager
manager = Manager()
a = manager.list([i for i in range(size)])
print 'test shared manager list'
tranverse(a)
from multiprocessing.sharedctypes import RawArray
a = RawArray( 'i', [i for i in range(size)] )
print 'test sharedctypes list in main process'
tranverse(a)from multiprocessing import Process
ps = [Process(target=tranverse, args=(a, )) for i in range(8)]
print 'test sharedctypes list in subprocess'
for p in ps:
p.start()
for p in ps:
p.join()
本篇文章来源于：开发学院 http://edu.codepub.com 原文链接：http://edu.codepub.com/2010/0723/24518.php
python的multiprocessing模块提供两种共享内存，sharedctypes与Manager，
Manager效率较低，但支持远程共享内存。
sharedctypes效率较高，快Manager两个数量级，在多进程访问时与普通内存访问相当python的multiprocessing模块提供两种共享内存，sharedctypes与Manager，
Manager效率较低，但支持远程共享内存。
sharedctypes效率较高，快Manager两个数量级，在多进程访问时与普通内存访问相当
结果比较如下：
test array
elapsed 0:00:00.119707
test dict
elapsed 0:00:00.152856
test shared manager list
elapsed 0:00:37.87666
test sharedctypes list in main process
elapsed 0:00:00.154170
test sharedctypes list in subprocess
elapsed 0:00:00.303328
elapsed 0:00:00.327261
elapsed 0:00:00.349312
elapsed 0:00:00.318946
elapsed 0:00:00.364301
elapsed 0:00:00.370176
elapsed 0:00:00.343588
elapsed 0:00:00.348737
代码如下：
import array
from datetime import datetime, timedeltasize = 1000000
def tranverse(a):
t = datetime.now()
for i in range(size):
a[i]
print 'elapsed %s'% (datetime.now()- t)a = array.array('i', [i for i in range(size)])
print 'test array'
tranverse(a)
a = {}
for i in range(size):
a[i] = i
print 'test dict'
tranverse(a)
from multiprocessing import Manager
manager = Manager()
a = manager.list([i for i in range(size)])
print 'test shared manager list'
tranverse(a)
from multiprocessing.sharedctypes import RawArray
a = RawArray( 'i', [i for i in range(size)] )
print 'test sharedctypes list in main process'
tranverse(a)from multiprocessing import Process
ps = [Process(target=tranverse, args=(a, )) for i in range(8)]
print 'test sharedctypes list in subprocess'
for p in ps:
p.start()
for p in ps:
p.join()
本篇文章来源于：开发学院 http://edu.codepub.com 原文链接：http://edu.codepub.com/2010/0723/24518.php