Author: Robert Hyatt
Date: 15:02:47 11/08/01
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On November 08, 2001 at 06:25:01, Jonas Cohonas wrote: >On November 08, 2001 at 00:59:35, Robert Hyatt wrote: > >>On November 07, 2001 at 18:47:09, Jonas Cohonas wrote: >> >>>On November 07, 2001 at 18:40:04, Pablo Damian Appezzato wrote: >>> >>>>Hi Robert, i need your help about the tablebase in your ftp. I download the >>>>folder FIVE and this have 7GB!! of information (a total of 10 CD of 700 Mb). >>>>Now the 9 CD of Nalimov tablebase contain the 3, 4 and 5 pieces final. >>>> >>>>Why? >>> >>>Any posiblity of making TB's readable from .zip files? >>>(maby a stupid quetion, but it would cut the sizes in half) >>> >>>Regards >>>Jonas >> >>Wouldn't save a single byte. The TBs are _already_ compressed using a >>better algorithm than gzip. > >Actually i managed with winzip to shave off 4 MB of 571 MB, but i guess that is >not worth it? > >Regards >Jonas No, because you can't use those "on the fly". If you use gzip/bzip, they compress the entire file. To read the last byte, you have to uncompress the whole thing. When Eugene wrote the compression interface, he asked me to find the optimal blocksize. I ran my older quad for a few days compressing and uncompressing with various blocksizes to settle on 8K. Now we can read in any 8K block and decompress just that part, which makes on-the-fly decompression possible. As gzip does it, it would be hopelessly slow.
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