| Versions tested: | 4.20, 9.12b |
| Optimal parameters: | -m0=lzma2 -mx -md15m |
| Links: | http://7-zip.com |
| Authors: | Igor Pavlov, Dmitry Shkarin |
| Algorithms: | LZ+ARI, X86 |
| Notable peformances: | Application1, Application3, Game2, Qualifying1 |
the program website 2009, March 28LZMA is default and general compression method of 7z format. The main features of LZMA method:
- High compression ratio
- Variable dictionary size (up to 4 GB)
- Compressing speed: about 1 MB/s on 2 GHz CPU
- Decompressing speed: about 10-20 MB/s on 2 GHz CPU
- Small memory requirements for decompressing (depend from dictionary size)
- Small code size for decompressing: about 5 KB
- Supporting multi-threading and P4's hyper-threading
The program is featured in the bzip2 benchmark.
(Have info that should be added here? E-mail.)
| Ver | Rating | CPR | DPR | S.E. | R.E. | Ratio | C. kB/s | D. kB/s | ||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| <none> | ||||||||||||
| 4.20 | 100 | 100 | 100 | 71 | 10 | 3.764 | 2069 | 24484 | ||||
| 9.12b | 375 | +275% | +286% | +180% | +117% | +720% | 4.098 | +8.9% | 3614 | +75% | 31040 | +27% |
| -m0=lzma2 -mx -md15m | ||||||||||||
| 9.12b | 491 | 527 | 271 | 205 | 106 | 4.087 | 5053 | 30821 | ||||
| -mx -md48m | ||||||||||||
| 9.12b | 395 | 398 | 372 | 133 | 116 | 4.232 | 2807 | 31043 | ||||
| -mx -md4m | ||||||||||||
| 9.12b | 252 | 263 | 171 | 141 | 35 | 3.904 | 3844 | 29728 | ||||
| -mx1 | ||||||||||||
| 9.12b | 60 | 79 | 15 | 169 | 0 | 3.135 | 11645 | 26713 | ||||
| -mx1 -md48m | ||||||||||||
| 9.12b | 178 | 190 | 104 | 145 | 14 | 3.695 | 4726 | 30733 | ||||
| -mx3 | ||||||||||||
| 9.12b | 109 | 128 | 40 | 167 | 3 | 3.389 | 7839 | 28972 | ||||