commit	6c69dc176c318fba721fa8adade53f3e413cac52	[log] [download]
author	Yann Collet <yann.collet.73@gmail.com>	Mon Mar 30 18:34:15 2015 +0100
committer	Yann Collet <yann.collet.73@gmail.com>	Mon Mar 30 18:34:15 2015 +0100
tree	2c1d73f7ae359a035d2d9ad11611535a29a4d5a7
parent	44793b8be9f18bb51f524b3a210de11bb0df6654 [diff]

tree: 2c1d73f7ae359a035d2d9ad11611535a29a4d5a7

README.md

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. A high compression derivative, called LZ4_HC, is also provided. It trades CPU time for compression ratio.

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. Direct commit to “master” are not permitted.
Feature branches can also exist, for dedicated testing of larger modifications before merge into “dev” branch.

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
LZ4 (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

The LZ4 block compression format is detailed within lz4_Block_format.

For streaming unknown amount of data and compress files of any size, a frame format has been published, and can be consulted within the file LZ4_Frame_Format.html .