python并行利用多核处理学习-压缩文件

2020-04-14  本文已影响0人  小黑佬

GNU并行示例:


要递归压缩或解压缩目录:

find . -type f | parallel gzip
find . -type f | parallel gzip -d
要将当前目录压缩到.gz.tar中,请执行以下操作:

parellel ::: gzip && cd .. && tar -cvf archive.tar dir/to/compress

使用Python编写GNU Parallel脚本:


以下python脚本构建bash命令,以递归方式压缩或解压缩给定路径。

要将目录中的所有文件压缩到以该文件夹命名的tar中:
./gztar.py -c /dir/to/compress

要将所有文件从tar解压缩到以tar命名的文件夹中:
./gztar.py -d /tar/to/decompress

#! /usr/bin/python
# This script builds bash commands that compress files in parallel

def compress(dir):
    os.system('find ' + dir + ' -type f | parallel gzip -q && tar -cf '
              + os.path.basename(dir) + '.tar -C ' + dir + ' .')

def decompress(tar):
    d = os.path.splitext(tar)[0]
    os.system('mkdir ' + d + ' && tar -xf ' + tar + ' -C ' + d +
          ' && find ' + d + ' -name *.gz -type f | parallel gzip -qd')

p = argparse.ArgumentParser()
p.add_argument('-c', '--compress', metavar='/DIR/TO/COMPRESS', nargs=1)
p.add_argument('-d', '--decompress', metavar='/TAR/TO/DECOMPRESS.tar', nargs=1)
args = p.parse_args()

if args.compress:
    compress(str(args.compress)[2:-2])
if args.decompress:
    decompress(str(args.decompress)[2:-2])

使用纯Python的多线程压缩:


如果由于某种原因您不想将gnu并行用于队列命令,我编写了一个小脚本,该脚本仅使用python(无bash调用)进行多线程压缩。由于python GIL因瓶颈而臭名昭著,因此在调用时要格外小心multiprocessing()。此实现还具有以下优点:CPU节流标志,压缩/解压缩后删除标志以及压缩过程中的进度条。

  1. 首先,检查并确保您具有所有必需的pip模块:
    pip install tqdm
  2. 第二个链接gztar.py文件到/ usr / bin:
    sudo ln -s /path/to/gztar.py /usr/bin/gztar
  3. 现在,使用新的gztar命令压缩或解压缩目录:
    gztar -c /dir/to/compress -r -t
#! /usr/bin/python
## A pure python implementation of parallel gzip compression using multiprocessing
import os, gzip, tarfile, shutil, argparse, tqdm
import multiprocessing as mp

#######################
### Base Functions
###################
def search_fs(path):
    file_list = [os.path.join(dp, f) for dp, dn, fn in os.walk(os.path.expanduser(path)) for f in fn]
    return file_list

def gzip_compress_file(path):
    with open(path, 'rb') as f:
        with gzip.open(path + '.gz', 'wb') as gz:
            shutil.copyfileobj(f, gz)
    os.remove(path)

def gzip_decompress_file(path):
    with gzip.open(path, 'rb') as gz:
        with open(path[:-3], 'wb') as f:
            shutil.copyfileobj(gz, f)
    os.remove(path)

def tar_dir(path):
    with tarfile.open(path + '.tar', 'w') as tar:
        for f in search_fs(path):
            tar.add(f, f[len(path):])

def untar_dir(path):
    with tarfile.open(path, 'r:') as tar:
        tar.extractall(path[:-4])

#######################
### Core gztar commands
###################
def gztar_c(dir, queue_depth, rmbool):
    files = search_fs(dir)
    with mp.Pool(queue_depth) as pool:
        r = list(tqdm.tqdm(pool.imap(gzip_compress_file, files),
                           total=len(files), desc='Compressing Files'))
    print('Adding Compressed Files to TAR....')
    tar_dir(dir)
    if rmbool == True:
        shutil.rmtree(dir)

def gztar_d(tar, queue_depth, rmbool):
    print('Extracting Files From TAR....')
    untar_dir(tar)
    if rmbool == True:
        os.remove(tar)
    files = search_fs(tar[:-4])
    with mp.Pool(queue_depth) as pool:
        r = list(tqdm.tqdm(pool.imap(gzip_decompress_file, files),
                           total=len(files), desc='Decompressing Files'))

#######################
### Parse Args
###################
p = argparse.ArgumentParser('A pure python implementation of parallel gzip compression archives.')
p.add_argument('-c', '--compress', metavar='/DIR/TO/COMPRESS', nargs=1, help='Recursively gzip files in a dir then place in tar.')
p.add_argument('-d', '--decompress', metavar='/TAR/TO/DECOMPRESS.tar', nargs=1, help='Untar archive then recursively decompress gzip\'ed files')
p.add_argument('-t', '--throttle', action='store_true', help='Throttle compression to only 75%% of the available cores.')
p.add_argument('-r', '--remove', action='store_true', help='Remove TAR/Folder after process.')
arg = p.parse_args()
### Flags
if arg.throttle == True:
    qd = round(mp.cpu_count()*.75)
else:
    qd = mp.cpu_count()
### Main Args
if arg.compress:
    gztar_c(str(arg.compress)[2:-2], qd, arg.remove)
if arg.decompress:
    gztar_d(str(arg.decompress)[2:-2], qd, arg.remove)

文章来源:
tar.gz vs zip

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