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RE: [Bug-gnubg] Bug: 14 point one-sided race database withmakebearoff.ex
From: |
Ian Shaw |
Subject: |
RE: [Bug-gnubg] Bug: 14 point one-sided race database withmakebearoff.exe |
Date: |
Thu, 6 Jan 2005 09:50:53 -0000 |
From: Øystein Johansen
Sent: 05 January 2005 21:15
> Joachim Matussek wrote:
> | Hello,
> |
> | i tried to create one-sided race databases with makebearoff.exe. At
> | first i created one for 13 points which worked well.
> |
> | Afterwards i tried 14 points but the program stopped when the temp
> | file reached a size of about 2,1 GB (2147483647 bytes). I
> tried under
> | Windows with NTFS as well as under Linux with FAT32. Error message
> | under Linux was "File size limit exceeded". I don´t
> remember the error
> | message under Windows but I think it was an internal message of the
> | .exe.
>
> Hmmmmm.... this sounds familiar. Hasn't this been reported
> before? I may be wrong but wasn't it Morten Wang who reported
> this problem years ago?
> Or maybe it was Ian?
>
> If I remember correctly Ian (Shaw) and Morten are the two
> users who have built the biggest bearoff databases. Maybe one
> of them knows something?
>
> Worst case we could make a limit of 13 point for the one
> sided database.
> This would be a bad solution though since storeage of several
> Gigabytes is no problem anymore.
>
There is a limit on the file size that the PC file system can handle. It is
2^31 bytes = 2147483647. I assume it's 2^31 instead of 2^32 because the 32nd
bit is used as the +/- sign.
Anyway, this puts a limit on the size of the database. 13 points works but 14
doesn't, as you have seen.
On a related note, I've been wondering if the two sided database could be
compressed by omitting gin positions, that is, positions where one side is
guaranteed a win but no gammon is possible. This out to have a greater and
greater effect as the size of the database increases, since you will have more
and more lop-sided positions.
-- Ian
- RE: [Bug-gnubg] Bug: 14 point one-sided race database withmakebearoff.exe,
Ian Shaw <=
- RE: [Bug-gnubg] Bug: 14 point one-sided race database withmakebearoff.exe, Joachim Matussek, 2005/01/06
- Re: [Bug-gnubg] Bug: 14 point one-sided race database withmakebearoff.exe, Jim Segrave, 2005/01/06
- Re: [Bug-gnubg] Bug: 14 point one-sided race database withmakebearoff.exe, Øystein Johansen, 2005/01/06
- Re: [Bug-gnubg] Bug: 14 point one-sided race database withmakebearoff.exe, Jim Segrave, 2005/01/06
- Re: [Bug-gnubg] Bug: 14 point one-sided race database withmakebearoff.exe, Michael Petch, 2005/01/06
- Re: [Bug-gnubg] Bug: 14 point one-sided race database withmakebearoff.exe, Michael Petch, 2005/01/06
- Re: [Bug-gnubg] Bug: 14 point one-sided race database withmakebearoff.exe, Jim Segrave, 2005/01/06