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Thread: lrzip a file compressor for linux

  1. #1
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    lrzip a file compressor for linux

    anyone here has tested this file compressor under linux?

    ---
    (29-NOV-2009): http://ck.kolivas.org/apps/lrzip/lrzip-0.42/
    ---
    linux x86: http://ck.kolivas.org/apps/lrzip/sta...686-static.bin
    linux x64: http://ck.kolivas.org/apps/lrzip/sta...x64.static.bin
    ---

    short:

    - it is a derivat from rzip - developed from Con Kolivas

    - as compression-engine it can use lzop, lzma, bzip2, zpaq or gzip

    - sadly for now there is not a windows compile

    The major disadvantages are:

    - It only works on single files.
    To get the best performance out of the compression
    it is best to tarball all your files together.

    - It requires a lot of memory to get the best performance out of,
    and is not really usable (for compression) with less than 256MB.
    Decompression requires less ram and works on small ram machines.

    - Does not work on stdin/stdout.


    source:
    ---
    http://ck.kolivas.org/apps/lrzip/README
    ---
    lrzip v0.42

    Long Range ZIP or Lzma RZIP

    This is a compression program optimised for large files.
    The larger the file and the more memory you have,
    the better the compression advantage this will provide,
    especially once the files are larger than 100MB.
    The advantage can be chosen to be either size (much smaller than bzip2)
    or speed (much faster than bzip2).

    Quick lowdown of the 3 most used options:

    lrzip filename
    This will produce an archive filename.lrz compressed with lzma
    (best all round)
    - slow compression and fast decompression

    lrzip -z filename
    This will produce an archive filename.lrz compressed with ZPAQ
    - extreme compression but which takes ages to compress and decompress

    lrzip -l filename
    This will produce an archive filename.lrz compressed with LZO
    - very fast compression and fast decompression

    Lrzip uses an extended version of rzip

    which does a first pass long distance redundancy reduction.
    The lrzip modifications make it scale according to memory size.
    The data is then either:
    1. Compressed by lzma (default) which gives excellent compression
    at approximately twice the speed of bzip2 compression
    2. Compressed by a number of other compressors chosen for different reasons, in order of likelihood of usefulness:
    2a. ZPAQ: Extreme compression up to 20% smaller than lzma but ultra slow
    at compression AND decompression.
    2b. LZO: Extremely fast compression and decompression which on most machines compresses faster than disk writing making it as fast (or even faster) than simply copying a large file
    2c. GZIP: Almost as fast as LZO but with better compression.
    2d. BZIP2: A defacto linux standard of sorts but is the middle ground between
    lzma and gzip and neither here nor there.
    3. Leaving it uncompressed and rzip prepared.
    This form improves substantially any compression performed on the resulting file in both size and speed (due to the nature of rzip preparation merging similar compressible blocks of data and creating a smaller file).
    By "improving" I mean it will either speed up the very slow compressors with minor detriment to compression, or greatly increase the compression of simple compression algorithms.

  2. #2
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    looks like the same idea as SREP...

  3. #3
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    original rep is based on idea of lrzip IIRC
    I am... Black_Fox... my discontinued benchmark
    "No one involved in computers would ever say that a certain amount of memory is enough for all time? I keep bumping into that silly quotation attributed to me that says 640K of memory is enough. There's never a citation; the quotation just floats like a rumor, repeated again and again." -- Bill Gates

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