57 lines
2.6 KiB
Markdown
57 lines
2.6 KiB
Markdown
LZ4 - Extremely fast compression
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LZ4 is lossless compression algorithm, providing compression speed at 400 MB/s per core, scalable with multi-cores CPU. It also features an extremely fast decoder, with speed in multiple GB/s per core, typically reaching RAM speed limits on multi-core systems.
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A high compression derivative, called LZ4_HC, is also provided. It trades CPU time for compression ratio.
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|Branch |Status |
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|------------|---------|
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|master | [](https://travis-ci.org/Cyan4973/lz4) |
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|dev | [](https://travis-ci.org/Cyan4973/lz4) |
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This is an official mirror of LZ4 project, [hosted on Google Code](http://code.google.com/p/lz4/).
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The intention is to offer github's capabilities to lz4 users, such as cloning, branch, pull requests or source download.
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The "master" branch will reflect, the status of lz4 at its official homepage.
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The "dev" branch is the one where all contributions will be merged. If you plan to propose a patch, please commit into the "dev" branch. Direct commit to "master" are not permitted.
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Feature branches will also exist, typically to introduce new requirements, and be temporarily available for testing before merge into "dev" branch.
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Benchmarks
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-------------------------
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The benchmark uses the [Open-Source Benchmark program by m^2 (v0.14.2)](http://encode.ru/threads/1371-Filesystem-benchmark?p=33548&viewfull=1#post33548) compiled with GCC v4.6.1 on Linux Ubuntu 64-bits v11.10,
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The reference system uses a Core i5-3340M @2.7GHz.
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Benchmark evaluates the compression of reference [Silesia Corpus](http://sun.aei.polsl.pl/~sdeor/index.php?page=silesia) in single-thread mode.
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<table>
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<tr>
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<th>Compressor</th><th>Ratio</th><th>Compression</th><th>Decompression</th>
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</tr>
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<tr>
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<th>LZ4 (r101)</th><th>2.084</th><th>422 MB/s</th><th>1820 MB/s</th>
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</tr>
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<tr>
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<th>LZO 2.06</th><th>2.106</th><th>414 MB/s</th><th>600 MB/s</th>
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</tr>
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<tr>
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<th>QuickLZ 1.5.1b6</th><th>2.237</th><th>373 MB/s</th><th>420 MB/s</th>
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</tr>
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<tr>
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<th>Snappy 1.1.0</th><th>2.091</th><th>323 MB/s</th><th>1070 MB/s</th>
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</tr>
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<tr>
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<th>LZF</th><th>2.077</th><th>270 MB/s</th><th>570 MB/s</th>
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</tr>
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<tr>
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<th>zlib 1.2.8 -1</th><th>2.730</th><th>65 MB/s</th><th>280 MB/s</th>
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</tr>
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<tr>
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<th>LZ4 HC (r101)</th><th>2.720</th><th>25 MB/s</th><th>2080 MB/s</th>
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</tr>
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<tr>
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<th>zlib 1.2.8 -6</th><th>3.099</th><th>21 MB/s</th><th>300 MB/s</th>
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</tr>
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</table>
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