| Versions tested: | 0.35b, 0.39 |
| Optimal parameters: | L3 |
| Links: | http://www.quicklz.com/ |
| Authors: | Lasse Reinhold |
| Algorithms: | LZ |
| Notable peformances: | Audio1, FP1, Image1, Medical1, Pitches1, Qualifying1, Qualifying2 |
qpress is a portable file archiver designed to utilize fast storage systems to their max. It supportsthe program website April 13, 2009
- multiple cores, reaching upto 1.1 Gbyte/s in-memory compression on a quad core Xeon
- 64-bit file sizes and tested with terabyte sized archives containing millions of files and directories
- pipes and redirection and *nix-like behaviour for scripting and flexibility
- Adler32 checksums to ensure that decompressed data has not been corrupted
- data recovery of damaged archives with 64 Kbyte grannularity
- unbuffered disk I/O (Windows only) to prevent disk cache of other applications from being flushed
(Have info that should be added here? E-mail.)
| Ver | Rating | CPR | DPR | S.E. | R.E. | Ratio | C. kB/s | D. kB/s | ||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| L1 | ||||||||||||
| 0.35b | 0 | 1 | 0 | 190 | 0 | 1.961 | 169776 | 131297 | ||||
| 0.39 | 0 | -30% | 1.961 | 0% | 82243 | -52% | 140514 | +7.0% | ||||
| L2 | ||||||||||||
| 0.35b | 1 | 2 | 0 | 241 | 0 | 2.098 | 134458 | 126088 | ||||
| 0.39 | 1 | - | -27% | 2.098 | 0% | 73823 | -45% | 136955 | +8.6% | |||
| L3 | ||||||||||||
| 0.35b | 2 | 3 | 0 | 227 | 0 | 2.197 | 76025 | 135447 | ||||
| 0.39 | 2 | - | -19% | 2.197 | 0% | 53532 | -30% | 145869 | +7.7% | |||