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Lbzip2 is a Pthreads-based parallel bzip2/bunzip2 filter, passable to GNU tar with the --use-compress-program option. It isn't restricted to regular files on input, nor output. Successful splitting for decompression isn't guaranteed, just very likely (failure is detected). Splitting in both modes and compression itself occur with an approximate 900k block size. On an Athlon-64 X2 6000+, lbzip2 was 92% faster than standard bzip2 when compressing, and 45% faster when decompressing (based on wall clock time). Lbzip2 strives to be portable by requiring UNIX 98 APIs only, besides an unmodified libbz2. License: GNU General Public License (GPL) Changes:
The shell script test.sh tests the installed instance of lbzip2, which can be different from the currently built one. pbzip2 is not a requirement for testing anymore, but test.sh will try to measure its performance if it's available. The same applies to the bzip2 module of 7za (from p7zip). Some GNU/Linux specific hints on enabling SUSv2 conformance (which is required for building and testing) were added to the README.



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