bzip2smp parallelizes the bzip2 compression process to achieve a near-linear performance increase on SMP machines. On a two-processor Xeon machine, the speedup is around 180%. The tool's main purpose is to aid performing heavy-duty server backups. It can also be used on modern desktop multicore processors (such as AMD Athlon64 X2 and Intel Pentium D).
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Amigadepacker uncompresses various compression
formats used on AmigaOS. The supported formats are
PowerPacker, XPK SQSH, MMCMP, and StoneCracker 4.04. It can also decrypt PowerPacker encrypted data files.
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Zzip-zzlib is a compression utility and library
for Unix and Windows. It uses several steps,
including Burrows-Wheeler Transformation, and
often gets better compression than bzip2.
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LZHAM is a general purpose lossless data compression library that borrows many ideas from LZMA, but purposely makes several key tradeoffs that favor decompression speed over compression ratio. LZHAM's compression ratio is typically within .5% of LZMA, but decompresses 2-3 times faster. LZHAM's compressor is heavily threaded in a way that does not sacrifice compression ratio. The decompressor supports streaming and memory to memory decompression, and is designed to be particularly fast on embedded devices, handhelds, and game console platforms.
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lxz aims to create xz-compatible compressed files, utilizing multiple threads and liblzma. It was forked from lbzip2-0.23 and inherited the same internal structure. It supports compression only (basic features), and will lose its raison d'etre as soon as xz itself gets multithreading support.
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JBDiff (Java Binary Diff) utility is a Java port of the C based bsdiff utility by Colin Percival.
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Fivebit is a Python 3 compression library for short text strings. It compresses short strings of text into five bit encoding, which yields a 37.5% reduction for lowercase ASCII. There is also a dictionary for the 1024 most common English words (3 letters or longer). Punctuation, digits, and normal symbols will usually take up 10 bits each, and oddball Unicode characters will take up more space again.
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remove/rename/move old files assists in the
management of old files by removing, moving, or
compressing them. It is a configuration file-based
program written in Perl.
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Pipa reads data from stdin and does various things with it: rotates by time interval / output file size; compresses it (gz, bz2, lzo, xz); names the output file with strftime(); splits it intelligently when given info about the file structure (newlines / PCAP); calls a user command on the finished output file; passes it to stdout (like tee); and more.
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Shoelacer attempts to generate a pair of small C
functions that compress or decompress a set of
data (primarily short strings) presented to it,
and possibly other data of that kind. The data it
is given may consist of entries of just a few
bytes or longer. Its goal is to be reasonably fast
with a tiny memory overhead. Compression
performance is not so much the goal, although it
certainly isn't ignored.
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