| commit | fe11e0b142e383f8602ef54fc56011cc60cdfaf7 | [log] [download] |
|---|---|---|
| author | Takayuki MATSUOKA <takayuki.matsuoka@gmail.com> | Fri May 15 09:27:44 2015 +0900 |
| committer | Takayuki MATSUOKA <takayuki.matsuoka@gmail.com> | Fri May 15 09:27:44 2015 +0900 |
| tree | d332d96b36405f54d9c816d1ce432f8dd16c60b6 | |
| parent | f02c4671cdeab39635b924b922a8cb29b466e796 [diff] |
Issue #103 : Add compatibility test between releases
Add forward/backward compatibility test between all versions
- Add new Makefile target "versionstest".
- Standard test procedure like "make versionstest && make clean"
works properly.
test/test-lz4-versions.py
- This script creates test/lz4test and checkout all
Release tagged versions. After that, compile all versions of
lz4c and lz4c32 and compress/decompress between all versions.
- This test clones entire git repository to checkout all tags.
- Since Travis's default command does not clone entire repository,
we could not checkout all tags from Travis' default clone.
- After that, test script shows all unique .lz4 files. In this list,
'r999' means 'head' of current working copy.
- .travis.yml[diff]
- Makefile[diff]
- test/Makefile[Added - diff]
- test/test-lz4-versions.py[Added - diff]
- .gitattributes
- .travis.yml
- Makefile
- NEWS
- README.md
- cmake_unofficial/
- examples/
- lib/
- lz4_Block_format.md
- lz4_Frame_format.md
- programs/
- test/
- 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 |
| 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. A list of these sources is maintained on the LZ4 Homepage.