I am pleased to announce the release of plzip 1.7.
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 (0.4 to 2 percent larger compressed files). Note that the number
of usable threads is limited by file size; 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.
Plzip uses the lzip file format; the files produced by plzip are fully
compatible with lzip-1.4 or newer, and can be rescued with lziprecover.
The lzip file format is designed for data sharing and long-term
archiving, taking into account both data integrity and decoder availability.
The homepage is at http://www.nongnu.org/lzip/plzip.html
The sources can be downloaded from
http://download.savannah.gnu.org/releases/lzip/plzip/
The sha256sums are:
70697c1b1f76e8e85ecbd7d1cb96eb545e52972dfbf76fb34b9a3f4c87e559dd
plzip-1.7.tar.lz
95e22cdd98eb2f41bf4fb169530a5945aad2fec20c2e2284d597e77972baf2b7
plzip-1.7.tar.gz
This release is also GPG signed. You can download the signature by
appending '.sig' to the URL. If the 'gpg --verify' command fails because
you don't have the required public key, then run this command to import it:
gpg --keyserver keys.gnupg.net --recv-keys 8FE99503132D7742
Key fingerprint = 1D41 C14B 272A 2219 A739 FA4F 8FE9 9503 132D 7742
Changes in version 1.7:
* When compressing on a 32 bit system, plzip now tries to limit the
memory use to under 2.22 GiB (4 worker threads at level -9) by reducing
the number of threads below the system's default.
* The option '--loose-trailing', has been added.
* The test used by plzip to discriminate trailing data from a corrupt
header in multimember regular (seekable) files has been improved to a
Hamming distance (HD) of 3, and the 3 bit flips must happen in different
magic bytes for the test to fail. As a consequence some kinds of files
no longer can be appended to a lzip file as trailing data unless the
'--loose-trailing' option is used when decompressing.
Lzlib 1.10 or newer is required for this test to work on non-seekable files.
Lziprecover can be used to remove conflicting trailing data from a file.
* The 'bits/byte' ratio has been replaced with the inverse
compression ratio in the output.
* The progress of decompression is now shown at verbosity level 2
(-vv) or higher.
* Progress of (de)compression is only shown if stderr is a terminal.
* A second '.lz' extension is no longer added to the argument of '-o'
if it already ends in '.lz' or '.tlz'.
* The dictionary size is now shown at verbosity level 4 (-vvvv) when
decompressing or testing.
* The new chapter "Meaning of plzip's output", and a block diagram of
plzip have been added to the manual.
Please send bug reports and suggestions to [email protected]
Regards,
Antonio Diaz, plzip co-author and maintainer.
--
If you are distributing software in xz format, please consider using
lzip instead. See http://www.nongnu.org/lzip/lzip_benchmark.html#xz1 and
http://www.nongnu.org/lzip/xz_inadequate.html
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