Python tarfile 比 Linux 命令慢

问题描述

我尝试了不同的方式来压缩文件夹.我的理解是 Python 内置模块总是比 subprocess.call("Linux command") 快.但我只是做了一些演示.tarfile 模块比 subprocess.call("tar") 慢.有人可以向我解释一下吗?

I tried the different way to zip folder.My understanding is that Python built-in module always faster than subprocess.call("Linux command"). But I just did some demo. The tarfile module is slow than subprocess.call("tar").Can someone explain it to me?

    #!/usr/bin/python

import os
import time
import tarfile
import subprocess

tStart1 = time.time()

TestFolder = ["Jack", "Robin"]
for folder in TestFolder:
    name = "/mnt/ShareDrive/Share/ExistingUsers/"+folder
    path = "/mnt/TEST2/"
    tar = tarfile.open(path+folder+".tar.gz", "w:gz")
    tar.add(name)
    tar.close()
tEnd1 = time.time()

time.sleep(2)

tStart2 = time.time()
for folder in TestFolder:
    path = "/mnt/TEST1/"
    subprocess.call(["tar", "zcvf", path+folder+".tar.gz", "-P", "/mnt/ShareDrive/Share/ExistingUsers/"+folder])
tEnd2 = time.time()

print "The module cost %f sec" % (tEnd1 - tStart1)
print "The subprocess cost %f sec" % (tEnd2 - tStart2)

tarfile 模块耗时 63 秒.子流程仅需 32 秒.

The tarfile module cost 63 sec. The subprocess cost only 32 sec.

两个文件夹的总大小为 433 MB

The total size of two folders is 433 MB

推荐答案

tar 是用 C 语言编写的.tarfile 模块是 tar 处理的纯 Python 实现.模块不可能比命令快.

tar is written in C. The tarfile module is a pure Python implementation of tar handling. There is no way that the module will be faster than the command.

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