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Subject: Re: 6Man and 7Man Tablebase

Author: Slater Wold

Date: 18:08:43 11/05/01

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On November 05, 2001 at 20:42:20, Dann Corbit wrote:

>On November 05, 2001 at 17:52:16, Slater Wold wrote:
>>On November 05, 2001 at 12:56:48, Eugene Nalimov wrote:
>>>On November 05, 2001 at 12:46:36, Slater Wold wrote:
>>>>On November 05, 2001 at 12:27:26, Eugene Nalimov wrote:
>>>>>On November 05, 2001 at 07:04:57, Mike Hood wrote:
>>>>>>On November 04, 2001 at 17:49:04, Manuel Rodriguez Blanco wrote:
>>>>>>>Threre is a free program for generate 6Man Tablebase?  and some 7man?
>>>>>>>if yes where?
>>>>>>>
>>>>>>>I know that Hiarcs7.32 come with TBGEN that generate 5man Tablebase but no 6Man,
>>>>>>>i think.
>>>>>>>
>>>>>>>Thanks very much,
>>>>>>>
>>>>>>>Manuel
>>>>>>
>>>>>>You'll find a few 6-piece tablebases at ftp://ftp.cis.uab.edu/pub/hyatt/TB/six
>>>>>>
>>>>>>If you remember that these are the compressed tablebases, and they have to be
>>>>>>generated in their uncompressed form (5 to 10 times bigger) you'll get an idea
>>>>>>of the memory requirements. TBGEN is able to generate 6-piece tablebases, but
>>>>>>you'll need to recompile the source code (it's also on this ftp site) and run it
>>>>>>on a 64-bit operating system with more than 2 GB of memory. Poor Windows :(
>>>>>
>>>>>All 6-man TBs on Bob's site were generated on the machine running Windows NT.
>>>>>
>>>>>Eugene
>>>>
>>>>LOL - Talking trash to a MS man.  Not smart when you don't know the facts.  :)
>>>>
>>>>That was NT for Alpha's though, correct?  It does have to be a 64-bit system,
>>>>AFAIK.  Am I wrong?
>>>
>>>Yes and no :-) Some of TBs were really generated on Alphas. But NT on Alpha runs
>>>as 32-bit system: it uses 64-bit integers if you explicitely specified that, but
>>>all the 'ints' and 'longs' -- as well as pointers -- are 32-bit. That means that
>>>the program cannot use more than 2Gb of address space for its data.
>>>
>>>And majority of the TBs were generated on the x86 system. It happened that for
>>>TB generation that system (dual Xeon-550, 2Gb RAM) is faster than dual 21164A
>>>Alpha. Mainly because Compaq dropped NT on Alpha, so there was no reason for MS
>>>to buy newer hardware. We have to support installed software, so we cannot just
>>>dump those Alpha systems into garbage, but no new development.
>>>
>>>Eugene
>>
>>Well, my question was actually aimed at this:
>>
>>Can my computer generate 6 piece TB's?
>>
>>If you don't know it's a Dual AMD 1.53Ghz with 1GB of RAM (probably be 3GB, the
>>max, in a month or so) running Windows 2000 Server.
>>
>>I understand compiling the kppkpp TB is probably out of the question, even with
>>my "good" hardware.  I doubt it'd even fit it on my HD uncompressed anyway.
>>
>>I was just curious if I could.
>
>Ram is really important.  3GB would definitely help.  And you have to have all
>of the 5's {decompressed!} before you can make any 6-man file.
>
>Not sure how big all the 5 man files are, but it's a lot of room.

Geez.  That is incredible.  The decompressed 5's are probably 20GB.  (Compressed
they are 7GB.)

All that computing power, to create the krrrrk in 4 months.  How exciting.  :)



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