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24 lines
1.2 KiB
Text
24 lines
1.2 KiB
Text
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lrzip (Long Range ZIP or Lzma RZIP) is a file compression program designed
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to do particularly well on very large files containing long distance redundancy.
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lrztar is a wrapper for lrzip to simplify compression and decompression
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of directories. lrzip uses an extended version of rzip which does a first pass
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long distance redundancy reduction. The lrzip modifications make it scale
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according to memory size. The data is then either:
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1. Compressed by lzma (default), zpaq, lzo, gzip or bzip2.
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2. Left uncompressed and rzip prepared.
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The major disadvantages are:
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1. The main lrzip application only works on single files so it requires the
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lrztar wrapper to fake a complete archiver.
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2. It requires a lot of memory to get the best performance out of, and is not
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really usable (for compression) with less than 256MB. Decompression requires
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less ram and works on smaller ram machines.
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3. It works on stdin/out but in a very inefficient manner generating temporary
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files on disk so this method of using lrzip is not recommended.
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4. Files compressed on a 64 bit OS with a compression window greater than 20
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(2 GB) may not decompress on a 32 bit OS.
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See the file README.benchmarks for performance examples and what kind of data
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lrzip is very good with.
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