Radyx is a file archiver which creates archives in the 7-zip format using only the LZMA2 compression algorithm provided by the Fast LZMA2 Library v0.9.1.
The library uses a parallel buffered radix matchfinder to enable multithreaded compression without splitting the input into large chunks or duplicating the entire matchfinder/encoder combination for every 2 threads. The RMF also has greater time and memory efficiency, using about 5.5x the dictionary size instead of 11.5 x for BT4. This rises to 6.5x for dictionary sizes above 64Mb. The library also uses a modified LZMA2 encoder employing speed tweaks from Zstandard. The result is faster compression in less RAM, especially when using 4+ threads.
The RMF is a block algorithm, which reduces the effective dictionary size. This results in slightly less compression than BT4 for a given dictionary size. To compensate, you can raise the compression level (the most efficient way) or set high-compression mode using -ma=3 on the command line.
The radix match finder only finds the longest match (up to the fast length value) which slightly decreases compression performance when using optimized encoding (level 4 and up). To compensate, Radyx has a hybrid mode which adds a small sliding window dictionary and hash chain. This is enabled at level 8 and above.
A VS2017 project is included. The code also builds with gcc v5.x or higher on Ubuntu Linux using the makefile.
Both Radyx and the library have passed heavy testing. However this is a beta release unsuitable for production environments. This version has no 7z extraction command or any other commands apart from addition of files to a new archive. 7-Zip is required for extraction.
Radyx has NO WARRANTY and is released under the GNU General Public License 3.0: www.gnu.org/licenses/gpl.html