Alpha version of LZMA2 codec:
http://dl.7-zip.org/lzma2_466a.7z
INSTALL
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Copy "Codecs" folder to 7-Zip folder.
DESCRIPTION
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LZMA2 provides the following advantages over LZMA:
1) Better compression ratio for data than can't be compressed.
It can store such blocks of data in uncompressed form.
Also it decompresses such data faster.
2) Better multithreading support. If you compress big file, LZMA2 can split
that file to chunks and compress these chunks in multiple threads.
USAGE
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-m0c=Size : sets ChunkSize.
Examples:
-m0c=128m
If you don't specify ChunkSize, LZMA2 sets it to DictionarySize * 4,
but min = 1 MB and max = 256 MB.
LZMA2 uses:
1 thread for each chunk in -mx1 and -mx3 modes.
2 threads for each chunk in -mx5, -mx7 and -mx9 modes.
If LZMA2 is set to use only such number of threads required for one chunk,
it doesn't split stream to chunks. So you can get different compression
ratio for different number of threads (-mmt switch).
Examples:
7z a a.7z files -m0=lzma2
7z a a.7z files -m0=lzma2 -mmt2
7z a a.7z files -m0=lzma2 -mmt4
7z a a.7z files -m0=lzma2 -mmt4 -mx1
7z a a.7z files -m0=lzma2 -m0c=128m -m0d=8m -mmt4
NOTES!
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It's possible that future versions of 7-Zip will not support archives
created with this version of LZMA2.
So don't use this codec to backup important data.
Use this codec only for test purposes.
You can check the speed with timer.exe program:
http://downloads.sourceforge.net/sevenmax/7bench801.zip