| Versions tested: | 4.20, 4.65, 4.66a, 9.01a, 9.01a0 |
| Rating: | 362 |
| Performance C/D: | 352/710 |
| Optimal parameters: | -mx -md48m |
| Links: | http://7-zip.com |
| Authors: | Igor Pavlov, Dmitry Shkarin |
| Algorithms: | LZ+ARI, X86 |
| Notable peformances: | Application1, Application2, Application3, Database1, Game1, Game2, Medical2, OS1, PGN1, Pitches1, Qualifying1, Source1, Text1, Text2 |
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
(Have info that should be added here? E-mail.)
9.01a SFX does not support lzma2 ('Unsupported method'), so we configure it to use 7z.exe+7z.dll (listed as 9.01a0).
| Ver | Rating | CPR | DPR | S.E. | R.E. | Ratio | C. kB/s | D. kB/s | ||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| CompressionRatings.Com | ||||||||||||
| <none> | ||||||||||||
| 4.20 | 100 | 100 | 100 | 349 | 10 | 3.736 | 755 | 14207 | ||||
| 4.65 | 182 | +82% | +78% | +190% | +13% | +260% | 4.005 | +7.2% | 681 | -9.8% | 20852 | +47% |
| 4.66a | 181 | -0.5% | 0% | 0% | 0% | 0% | 4.005 | 0% | 680 | -0.1% | 20872 | +0% |
| 9.01a | 182 | +0.6% | 0% | +0.3% | 0% | 0% | 4.005 | 0% | 681 | +0.1% | 20899 | +0.1% |
| -m0=lzma2 -mx -md48m | ||||||||||||
| 9.01a0 | 322 | 314 | 641 | 408 | 137 | 4.357 | 557 | 21390 | ||||
| -mx -md48m | ||||||||||||
| 4.65 | 362 | 352 | 710 | 423 | 173 | 4.416 | 557 | 21100 | ||||
| 4.66a | 361 | -0.3% | 0% | -0.6% | 0% | -0.6% | 4.416 | 0% | 557 | 0% | 20974 | -0.6% |
| 9.01a | 361 | 0% | 0% | +1.1% | 0% | +0.6% | 4.415 | -0% | 557 | 0% | 21231 | +1.2% |
| -mx -md4m | ||||||||||||
| 4.65 | 139 | 137 | 193 | 379 | 19 | 3.873 | 724 | 19202 | ||||
| 4.66a | 139 | 0% | 0% | +1.0% | -0.3% | 0% | 3.873 | 0% | 723 | -0.1% | 19378 | +0.9% |
| 9.01a | 139 | 0% | 0% | -0.5% | +0.3% | 0% | 3.873 | 0% | 724 | +0.1% | 19295 | -0.4% |
| -mx1 | ||||||||||||
| 4.65 | 68 | 77 | 21 | 842 | 1 | 3.176 | 3515 | 18816 | ||||
| 4.66a | 68 | 0% | 0% | 0% | +0.2% | 3.176 | 0% | 3523 | +0.2% | 18782 | -0.2% | |
| 9.01a | 67 | -1.5% | -1.3% | +4.8% | -1.4% | 3.176 | 0% | 3463 | -1.7% | 18857 | +0.4% | |
| -mx1 -md48m | ||||||||||||
| 4.65 | 262 | 267 | 196 | 763 | 34 | 3.836 | 1552 | 21475 | ||||
| 4.66a | 262 | 0% | 0% | -0.5% | +0.1% | 0% | 3.836 | 0% | 1555 | +0.2% | 21380 | -0.4% |
| 9.01a | 260 | -0.8% | -0.7% | 0% | -0.7% | -2.9% | 3.835 | -0% | 1543 | -0.8% | 21376 | -0% |
| -mx3 | ||||||||||||
| 4.65 | 95 | 101 | 44 | 734 | 3 | 3.364 | 2367 | 19564 | ||||
| 4.66a | 95 | 0% | 0% | 0% | +0.1% | 3.364 | 0% | 2371 | +0.2% | 19505 | -0.3% | |
| 9.01a | 94 | -1.1% | -1.0% | 0% | -1.1% | 3.364 | 0% | 2343 | -1.2% | 19525 | +0.1% | |
| -mx8 | ||||||||||||
| 4.65 | 356 | 347 | 664 | 434 | 160 | 4.385 | 583 | 20959 | ||||
| 4.66a | 355 | -0.3% | 0% | 0% | 0% | 0% | 4.385 | 0% | 582 | -0.2% | 20975 | +0% |
| 9.01a | 355 | 0% | 0% | +0.6% | 0% | 0% | 4.385 | 0% | 583 | +0.2% | 21098 | +0.6% |