Projects / Plzip

Plzip

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. It 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). Plzip uses the lzip file format, and the files produced by plzip are fully compatible with lzip-1.4 or newer, and can be rescued with lziprecover.

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Recent releases

  •  12 May 2014 14:25

    Release Notes: Minor changes have been made. This is the final release candidate before 1.2 stable.

    •  21 Jan 2014 17:14

      Release Notes: Copying of file dates, permissions, and ownership now behaves like "cp -p". (If the user ID or the group ID can't be duplicated, the file permission bits S_ISUID and S_ISGID are cleared). Individual limits have been set on the number of packets produced by each decompresor worker thread to limit the amount of memory used in all cases. "plzip.texinfo" has been renamed "plzip.texi".

      •  27 Sep 2013 11:11

        Release Notes: Plzip now shows the progress of compression at verbosity level 2 (-vv). The signals "SIGUSR1" and "SIGUSR2" are no longer raised internally to signal a fatal error.

        •  22 Jul 2013 11:56

          Release Notes: Plzip now shows the progress of compression at verbosity level 2 (-vv). Signals "SIGUSR1" and "SIGUSR2" are no longer raised internally to signal a fatal error.

          •  05 Jun 2013 12:06

            Release Notes: Scalability of compression (max number of useful worker threads) has been increased. Scalability when decompressing from/to regular files has been increased. The number of worker threads is now limited to the number of members in the input file when decompressing from a regular file. "configure" now accepts options with a separate argument. The targets "install-as-lzip" and "install-bin" have been added to the Makefile.

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