lz4-dev.zip_compress_lz4_world

LZ4 - Extremely fast compression ================================ 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 2-Clause license. |Branch |Status | |------------|---------| |master | [![Build Status][travisMasterBadge]][travisLink] [![Build status][AppveyorMasterBadge]][AppveyorLink] [![coverity][coverBadge]][coverlink] | |dev | [![Build Status][travisDevBadge]][travisLink] [![Build status][AppveyorDevBadge]][AppveyorLink] | [travisMasterBadge]: https://travis-ci.org/lz4/lz4.svg?branch=master "Continuous Integration test suite" [travisDevBadge]: https://travis-ci.org/lz4/lz4.svg?branch=dev "Continuous Integration test suite" [travisLink]: https://travis-ci.org/lz4/lz4 [AppveyorMasterBadge]: https://ci.appveyor.com/api/projects/status/github/lz4/lz4?branch=master&svg=true "Windows test suite" [AppveyorDevBadge]: https://ci.appveyor.com/api/projects/status/github/lz4/lz4?branch=dev&svg=true "Windows test suite" [AppveyorLink]: https://ci.appveyor.com/project/YannCollet/lz4-1lndh [coverBadge]: https://scan.coverity.com/projects/4735/badge.svg "Static code analysis of Master branch" [coverlink]: https://scan.coverity.com/projects/4735 > **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 [lzbench], from @inikep compiled with GCC v6.2.0 on Linux 64-bits. The reference system uses a Core i7-3930K CPU @ 4.5GHz. Benchmark evaluates the compression of reference [Silesia Corpus] in single-thread mode. [lzbench]: https://github.com/inikep/lzbench [Silesia Corpus]: http://sun.aei.polsl.pl/~sdeor/index.php?page=silesia | Compressor | Ratio | Compression | Decompression | | ---------- | ----- | ----------- | ------------- | | memcpy | 1.000 | 7300 MB/s | 7300 MB/s | |**LZ4 fast 8 (v1.7.3)**| 1.799 |**911 MB/s** | **3360 MB/s** | |**LZ4 default (v1.7.3)**|**2.101**|**625 MB/s** | **3220 MB/s** | | LZO 2.09 | 2.108 | 620 MB/s | 845 MB/s | | QuickLZ 1.5.0 | 2.238 | 510 MB/s | 600 MB/s | | Snappy 1.1.3 | 2.091 | 450 MB/s | 1550 MB/s | | LZF v3.6 | 2.073 | 365 MB/s | 820 MB/s | | [Zstandard] 1.1.1 -1 | 2.876 | 330 MB/s | 930 MB/s | | [Zstandard] 1.1.1 -3 | 3.164 | 200 MB/s | 810 MB/s | | [zlib] deflate 1.2.8 -1| 2.730 | 100 MB/s | 370 MB/s | |**LZ4 HC -9 (v1.7.3)** |**2.720**| 34 MB/s | **3240 MB/s** | | [zlib] deflate 1.2.8 -6| 3.099 | 33 MB/s | 390 MB/s | [zlib]: http://www.zlib.net/ [Zstandard]: http://www.zstd.net/ LZ4 is also compatible and well optimized for x32 mode, for which it provides an additional +10% speed performance. Installation ------------------------- ``` make make install # this command may require root access ``` LZ4's `Makefile` supports standard [Makefile conventions], including [staged installs], [redirection], or [command redefinition]. It is compatible with parallel builds (`-j#`). [Makefile conventions]: https://www.gnu.org/prep/standards/html_node/Makefile-Conventions.html [staged installs]: https://www.gnu.org/prep/standards/html_node/DESTDIR.html [redirection]: https://www.gnu.org/prep/standards/html_node/Directory-Variables.html [command redefinition]: https://www.gnu.org/prep/standards/html_node/Utilities-in-Makefiles.html 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. [lz4_Block_format]: doc/lz4_Block_format.md [lz4_Frame_format]: doc/lz4_Frame_format.md 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]. [LZ4 Homepage]: http://www.lz4.org