Author: Vincent Lejeune
Date: 00:40:38 10/28/05
Go up one level in this thread
On October 27, 2005 at 23:45:08, Yakov Konoval wrote: >On October 27, 2005 at 22:17:18, Dann Corbit wrote: > >> >>What I would want from a set of EGTB files is the fastest possible access. >>So if decomression of the block was slower than reading the decompressed block, >>then the compression is literally "a waste of time." >> > >The krbnkrb EGTB has size about 160 GB (with using zlib.dll). With using >LZMA-algorithm this size can be reduced approximately up to 100 GB. >From the other side the fastest possible access is very important for a chess >playing-program, but not so important for data-mining programs. > >>>If you need provably the best compression, then look no further: >>>http://www.ii.uni.wroc.pl/~inikep/research/pasqda41b.zip >>> >>>According to this document: >>>http://www.maximumcompression.com/data/doc.php >>>pasqda41b achieved 1.3552 bits per byte against a large body of inputs. >>> >>>Comes with source code. But expect it to be a slow, slow memory hog. >> >>I looked up that program (pasqda41b), and it is designed for text files. So it >>probably won't work for EGTB files. > >Usually EGTBs can be compressed much better than 8/1.3552 times. >I know PAQAR4 archiver - it really gives optimal compression, but the speed >of compression is 4 KB(!!!) / sec. >(Probably pasqda41b is written by the authors of paqar4 - I'll check it). > >Yakov here : http://www.msoftware.co.nz/WinRK_benchmarks.php?osCsid=9f2b0cdf32a1cfde16e7c0c70f5213b5 I see a better and faster one : WinRK PWCM 512MB
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