Plzip

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Introduction

Plzip is a massively parallel (multi-threaded), lossless data compressor based on the lzlib compression library, with a user interface similar to the one of lzip, bzip2 or gzip.

Plzip can compress/decompress large files on multiprocessor machines much faster than lzip, at the cost of a slightly reduced compression ratio. Note that the number of usable threads is limited by file size, so on files larger than a few GB plzip can use hundreds of processors, but on files of only a few MB plzip is no faster than lzip.

In this plzip benchmark page you can find some tests showing the performance of plzip on a multiprocessor machine.

Plzip uses the lzip file format; the files produced by plzip are fully compatible with lzip-1.4 or newer.

The lzip file format is designed for long-term data archiving. It is clean, provides very safe 4 factor integrity checking, and is backed by the recovery capabilities of lziprecover.

Plzip uses the same well-defined exit status values used by lzip and bzip2, which makes it safer than compressors returning ambiguous warning values (like gzip) when it is used as a back end for tar or zutils.

Learn more about lzip in the Lzip Home Page.

Documentation

The manual is available in the info system of the GNU Operating System. Use info to access the top level info page. Use info plzip to access the plzip section directly.

An online manual for plzip can be found here.

Download

The latest released version of plzip can be found here. You may also subscribe to Freecode and receive an email every time a new version is released.

Hannes Domani kindly provided a Windows port of plzip that can also be downloaded from the Savannah download link just above.

How to Get Help

For general discussion of bugs in plzip the mailing list lzip-bug@nongnu.org is the most appropriate forum. Please send messages as plain text. Please do not send messages encoded as HTML nor encoded as base64 MIME nor included as multiple formats. Please include a descriptive subject line. If all of the subject are "bug in plzip" it is impossible to differentiate them.

An archive of the bug report mailing list is available at http://lists.nongnu.org/mailman/listinfo/lzip-bug.

How to Help

To contact the author, either to report a bug or to contribute fixes or improvements, send mail to lzip-bug@nongnu.org. Please send messages as plain text. If posting patches they should be in unified diff format against the latest version. They should include a text description.

See also the lzip project page at Savannah.

Licensing

This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.

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Copyright © 2014 Antonio Diaz Diaz
Lzip logo Copyright © 2013 Sonia Diaz Pacheco

You are free to copy, modify and distribute all or part of this article without limitation.

Updated: 2014/01/21