| commit | 02be6631beae8afa7140f6eece45333e91d22e4f | [log] [download] |
|---|---|---|
| author | KyleJHarper <KyleJHarper@gmail.com> | Mon Oct 26 01:38:14 2015 -0500 |
| committer | KyleJHarper <KyleJHarper@gmail.com> | Mon Oct 26 01:38:14 2015 -0500 |
| tree | 94a72c816f9e2675bcf3425eb4cdd38bc95b627a | |
| parent | 67b3a24707750d2f09d278cd46439ad6d94b93cb [diff] |
Took out the basics and placed them into basics.c. Added decompression and a wrapper for the generic call. I will likely break this file up into 2 examples before submission.
- examples/Makefile[diff]
- examples/argPerformanceTesting.c[Deleted - diff]
- examples/basics.c[Added - diff]
- examples/compress_functions.c[Added - diff]
- lib/lz4.c[diff]
- lib/lz4.h[diff]
- .gitattributes
- .travis.yml
- Makefile
- NEWS
- README.md
- cmake_unofficial/
- contrib/djgpp/
- examples/
- lib/
- lz4_Block_format.md
- lz4_Frame_format.md
- programs/
- versionsTest/
- visual/2012/
LZ4 - Extremely fast compression
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.
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 excellent decompression speed.
| 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.
Benchmarks
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 |
| 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 |
Documentation
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.
Other source versions
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.