commit | 6923f3e2306fc08431a0f9e78c6e6d1177905fc2 | [log] [download] |
---|---|---|
author | Yann Collet <yann.collet.73@gmail.com> | Wed Jun 29 17:12:24 2016 +0200 |
committer | Yann Collet <yann.collet.73@gmail.com> | Wed Jun 29 17:12:24 2016 +0200 |
tree | edf38abba90d44bad4e09d89e19ce24ba67008be | |
parent | 410ec81543755b8cac4bdf4736a2a140aee2efd7 [diff] |
Minor refactoring (code style)
LZ4 is lossless compression algorithm, providing compression speed at 400 MB/s per core, scalable with multi-cores CPU. It features an extremely fast decoder, with speed in multiple GB/s per core, typically reaching RAM speed limits on multi-core systems.
Speed can be tuned dynamically, selecting an “acceleration” factor which trades compression ratio for more speed up. On the other end, a high compression derivative, LZ4_HC, is also provided, trading CPU time for improved compression ratio. All versions feature the same decompression speed.
LZ4 library is provided as open-source software using BSD license.s
Branch | Status |
---|---|
master | |
dev |
Branch Policy:
- The “master” branch is considered stable, at all times.
- The “dev” branch is the one where all contributions must be merged before being promoted to master.
- If you plan to propose a patch, please commit into the “dev” branch, or its own feature branch. Direct commit to “master” are not permitted.
The benchmark uses the Open-Source Benchmark program by m^2 (v0.14.3) compiled with GCC v4.8.2 on Linux Mint 64-bits v17. The reference system uses a Core i5-4300U @1.9GHz. Benchmark evaluates the compression of reference Silesia Corpus in single-thread mode.
Compressor | Ratio | Compression | Decompression |
---|---|---|---|
memcpy | 1.000 | 4200 MB/s | 4200 MB/s |
LZ4 fast 17 (r129) | 1.607 | 690 MB/s | 2220 MB/s |
LZ4 default (r129) | 2.101 | 385 MB/s | 1850 MB/s |
LZO 2.06 | 2.108 | 350 MB/s | 510 MB/s |
QuickLZ 1.5.1.b6 | 2.238 | 320 MB/s | 380 MB/s |
Snappy 1.1.0 | 2.091 | 250 MB/s | 960 MB/s |
Zstandard 0.5.1 | 2.876 | 240 MB/s | 620 MB/s |
LZF v3.6 | 2.073 | 175 MB/s | 500 MB/s |
zlib 1.2.8 -1 | 2.730 | 59 MB/s | 250 MB/s |
LZ4 HC (r129) | 2.720 | 22 MB/s | 1830 MB/s |
zlib 1.2.8 -6 | 3.099 | 18 MB/s | 270 MB/s |
The raw LZ4 block compression format is detailed within lz4_Block_format.
To compress an arbitrarily long file or data stream, multiple blocks are required. Organizing these blocks and providing a common header format to handle their content is the purpose of the Frame format, defined into lz4_Frame_format. Interoperable versions of LZ4 must respect this frame format.
Beyond the C reference source, many contributors have created versions of lz4 in multiple languages (Java, C#, Python, Perl, Ruby, etc.). A list of known source ports is maintained on the LZ4 Homepage.