Author: Owen Lyne
Date: 07:54:09 09/17/99
Continuing to set iup my new Athlon with Crafty, tablebases, Winboard etc. So, I'm at the EGTB stage right now. Thought people might be interested in speed of generation - did all the 3/4 piece tablebases in about 90 minutes (Eugene quotes a PII/400 taking about 2 hours, so that sounds about right). Next though is 5 piece, I have 256MB of RAM but Eugene likes machines with 500+, so I may have a problem... Which bases (perhaps pwnless ones?) can I do and which are totally impossible with the code set up as it is? Can I try anything and just put up wirh ridiculous paging to disk and slow performance, or is it not even possible? Other thought is about compression - being able to run Crafty using compressed tablebases is absolutely awesome, and without taking a performance hit is astonishing! Great work Bob, Eugene and Andrew Kadatch! Now - how about generating tablebases, is it possible (either with current code, or to modify code so it is) to generate tablebases where the minors are compressed? That would be incredibly useful, especially again if it was without much performance hit. It's all very well saying compressed only take 6 gigabytes (I have plenty) but If I have to have all 22 gigabytes uncompressed while making them before I can compress any then ouch, I don't think I can manage... I presume I could figure out which minors are used to generate any one base and carefully compress and uncompress accordingly, but directly using compressed minors would be ideal. One step further, generate in compressed form (I know that's probably even more ridiculous, but would hugely help those operating in limited disc space). Of course I know the other thing someone with limited space can do is download not generate them, but when I got 3 or 4 KB/s to Bob's FTP site I knew that wasn't going to be any use for me... Not having to pay the phone bill anyway... From work I get much, much faster FTP, but via my ISP (Freeserve) and modem looks much slower (maybe time of day was also relevant, early morning UK time much better than evening UK time since thg latter is daytime in US). Owen
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