Port of Yann Collet’s LZ4 algorithm to C# by Clayton Stangeland.
Original LZ4 algorithm can be found at (http://code.google.com/p/lz4) it was created by Yann Collet. See license.txt for project license.
Building in Debug or Release will use the already generated C# files
LZ4Compressor.c and LZ4Decompressor.c are updated by manually comparing to the original LZ4 code and fixing any C# differences from C but leaving some of the macros to make comparing easier.
Then building in the Generated configuration will only build the LZ4SharpGenerator project which has a prebuild event that uses the MinGW gcc from CodeBlocks to generate the C# files from LZ4Compressor.c and LZ4Decompressor.c.
Compression times do not include disk I/O.
P4 = Pentium 4 2GHz 32 bit Windows XP
i5 = Intel i5 2.67 GHZ 64 bit Windows 7 running LZ4Sharp in 64 bit
LZ4Sharp = Timings for ‘webster’ from silesia corpus (http://sun.aei.plsl.pl/~sdeor/index.php?page=silesia)
memcpy and LZ4 = Timing for file ‘webster’ in silesia corpus in m2mark.exe from http://sd-1.archive-host.com/membres/up/182754578/m2mark.zip (or from link to benchmark program at http://code.google.com/p/lz4)
gzip = GZip from the Intel compiler built as a dll and accessed from C# by PInvoke
Ratio = compressed size / decompressed size (lower is better)
| Computer | Type | Compression (MB/s) | Decompression (MB/s) | Ratio (%) |
|---|---|---|---|---|
| P4 | memcpy | 217 | ||
| P4 | LZ4 | 82 | 304 | |
| P4 | LZ4Sharp | 43 | 150 | |
| P4 | LZ4Sharp | 49 | 181 | |
| i5 | memcpy | 1658 | ||
| i5 | LZ4 | 270 | 1184 | |
| i5 | LZ4Sharp | 207 | 758 | 49 |
| i5 | LZ4Sharp | 267 | 838 | 47 |
| i5 | gzip | 48 | 266 | 33 |
LZ4 C# is about 2/3 the speed of the c version. (Also, LZ4C# is slightly faster on the whole silesia corpus than on just the ‘webster’ file) LZ4 C# Compressed silesia corpus is 47% of uncompressed LZ4 C# Compressed ‘webster’ file is 49% of uncompressed