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| -rw-r--r-- | doc/plzip.1 | 30 |
1 files changed, 26 insertions, 4 deletions
diff --git a/doc/plzip.1 b/doc/plzip.1 index 99dfd8b..694a99d 100644 --- a/doc/plzip.1 +++ b/doc/plzip.1 @@ -1,12 +1,28 @@ .\" DO NOT MODIFY THIS FILE! It was generated by help2man 1.46.1. -.TH PLZIP "1" "February 2018" "plzip 1.7" "User Commands" +.TH PLZIP "1" "January 2019" "plzip 1.8" "User Commands" .SH NAME plzip \- reduces the size of files .SH SYNOPSIS .B plzip [\fI\,options\/\fR] [\fI\,files\/\fR] .SH DESCRIPTION -Plzip \- Parallel compressor compatible with lzip. +Plzip is a massively parallel (multi\-threaded) implementation of lzip, fully +compatible with lzip 1.4 or newer. Plzip uses the lzlib compression library. +.PP +Lzip is a lossless data compressor with a user interface similar to the +one of gzip or bzip2. Lzip can compress about as fast as gzip (lzip \fB\-0\fR) +or compress most files more than bzip2 (lzip \fB\-9\fR). Decompression speed is +intermediate between gzip and bzip2. Lzip is better than gzip and bzip2 +from a data recovery perspective. Lzip has been designed, written and +tested with great care to replace gzip and bzip2 as the standard +general\-purpose compressed format for unix\-like systems. +.PP +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. .SH OPTIONS .TP \fB\-h\fR, \fB\-\-help\fR @@ -71,6 +87,12 @@ alias for \fB\-9\fR .TP \fB\-\-loose\-trailing\fR allow trailing data seeming corrupt header +.TP +\fB\-\-in\-slots=\fR<n> +number of 1 MiB input packets buffered [4] +.TP +\fB\-\-out\-slots=\fR<n> +number of 1 MiB output packets buffered [64] .PP If no file names are given, or if a file is '\-', plzip compresses or decompresses from standard input to standard output. @@ -95,8 +117,8 @@ Plzip home page: http://www.nongnu.org/lzip/plzip.html .SH COPYRIGHT Copyright \(co 2009 Laszlo Ersek. .br -Copyright \(co 2018 Antonio Diaz Diaz. -Using lzlib 1.10 +Copyright \(co 2019 Antonio Diaz Diaz. +Using lzlib 1.11 License GPLv2+: GNU GPL version 2 or later <http://gnu.org/licenses/gpl.html> .br This is free software: you are free to change and redistribute it. |