| Versions tested: | 0.60, 0.666 |
| Optimal parameters: | -mex4 |
| Links: | http://freearc.org |
| Authors: | Bulat Ziganshin, Dmitry Shkarin, Ilya Grebnov, Igor Pavlov |
| Algorithms: | LZ+HUF, LZ+ARI, PPMII, BWT/ST+WFC/MTF, X86, LZP, DICT |
| Notable peformances: | Application1, Application4, Game1, Game2, OS1, Pitches1 |
FreeArc is an open source project maintained by Bulat Ziganshin. It combines his original work: tornado, Rep, Dict, delta preprocessing, improvements for LZMA match finding and much more. It also integrates open source compressors ppmd, LZMA (7-zip), grzipii and tta.
On February 22, 2009 the author submitted following switches: '-m1', '-m2', '-m3', '-mx', '-m9x'. Because the unarc/sfx codebase v0.50a requires multiple times of the needed memory, the author suggested '-m6' to be tested instead of '-mx'.
On April 18, 2010 updated configurations were submitted: -mex1..-mex5.
To avoid an error 'can't allocate memory required for (de)compression in...' in 0.60 for some modes -lc should be used to l limit memory usage: "-lc actually limits working set rather than puts hard limit on virtual memory usage"email
0.666 submitted on May 20, 2010 with following configurations: "-m1, -m2, -m3, -m4, -mx -lc500m, -m9d -lc500m".
other options (-mex..) should become obsolete - now FreeArc automatically uses as much cores as available. also i've fixed part of problems in memory handling you've found and -lc500m should use only 550-600 mb of memory.email May 20, 2010
(Have info that should be added here? E-mail.)
We use arc.exe+arc.groups for compressing.
| Ver | Rating | CPR | DPR | S.E. | R.E. | Ratio | C. kB/s | D. kB/s | ||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| <none> | ||||||||||||
| 0.60 | 882 | 1035 | 320 | 207 | 435 | 4.502 | 4348 | 15939 | ||||
| -m1 (-mex1) | ||||||||||||
| 0.60 | 47 | 100 | 6 | 344 | 0 | 2.807 | 57500 | 43827 | ||||
| 0.60 | 68 | +45% | +51% | + | +54% | 2.790 | -0.6% | 94008 | +63% | 67124 | +53% | |
| 0.666 | 66 | -2.9% | -2.0% | - | -3.2% | 2.790 | 0% | 92158 | -2.0% | 64394 | -4.1% | |
| -m2 (-mex2) | ||||||||||||
| 0.60 | 378 | 524 | 87 | 383 | 23 | 3.582 | 17834 | 35360 | ||||
| 0.60 | 611 | +62% | +112% | +10% | +85% | +30% | 3.516 | -1.8% | 45753 | +157% | 46962 | +33% |
| 0.666 | 639 | +4.6% | +7.4% | +2.1% | -3.7% | +20% | 3.557 | +1.2% | 43606 | -4.7% | 42570 | -9.4% |
| -m3 (-mex3) | ||||||||||||
| 0.60 | 748 | 908 | 243 | 272 | 197 | 4.180 | 7127 | 22633 | ||||
| 0.60 | 1409 | +88% | +147% | +7.0% | +151% | +24% | 3.992 | -4.5% | 26665 | +274% | 36576 | +62% |
| 0.666 | 1335 | -5.3% | -6.5% | -3.5% | -5.8% | -4.1% | 3.996 | +0.1% | 24683 | -7.4% | 35018 | -4.3% |
| -m4 (-mex4) | ||||||||||||
| 0.60 | 1606 | 1968 | 505 | 468 | 580 | 4.336 | 11277 | 34267 | ||||
| 0.666 | 1449 | -9.8% | -12% | -1.0% | -9.6% | -10% | 4.334 | -0% | 9926 | -12% | 34102 | -0.5% |
| -m9d -lc500m (-m9x -lc350) | ||||||||||||
| 0.60 | 551 | 555 | 508 | 138 | 247 | 4.451 | 2559 | 27703 | ||||
| 0.666 | 730 | +32% | +33% | +25% | +11% | +70% | 4.588 | +3.1% | 2663 | +4.1% | 27049 | -2.4% |
| -mex5 | ||||||||||||
| 0.60 | 1070 | 1295 | 350 | 275 | 460 | 4.428 | 6223 | 19916 | ||||
| -mx -lc500m (-m6 -lc350) | ||||||||||||
| 0.60 | 783 | 862 | 375 | 156 | 486 | 4.633 | 2875 | 14798 | ||||
| 0.666 | 792 | +1.1% | +0.9% | +2.7% | -3.2% | +7.4% | 4.668 | +0.8% | 2734 | -4.9% | 14330 | -3.2% |