Re: Very small size limit of Gnu Prolog "database"?

Hi Mark,

Are you using a 32 bits or 64 bits build of GNU Prolog? I would expect that to make a difference but is just a hint; I could be wrong.

Cheers,

Paulo
 

On 11/12/2012, at 18:49, Mark Roulo <[email protected]> wrote:

> I am exploring the size limits for GNU Prolog
> when used as a database.  Right now I have
> a prolog file that contains 10,000 simple facts.
> 
> It looks like this:
> 
>     is_a_widget('GUID:Widget-0000000').
>     is_a_widget('GUID:Widget-0000001').
>     is_a_widget('GUID:Widget-0000002').
>           :
>           :
>     is_a_widget('GUID:Widget-0009995').
>     is_a_widget('GUID:Widget-0009996').
>     is_a_widget('GUID:Widget-0009997').
>     is_a_widget('GUID:Widget-0009998').
>     is_a_widget('GUID:Widget-0009999').
> 
> The GNU Prolog compiler chokes when trying to compile it.
> 
>     xyzzy:Src kt$ gplc -o program blatz.pl
> 
>     Fatal Error: global stack overflow (size: 32768 Kb, reached: 32765 Kb,
>     environment variable used: GLOBALSZ) compilation failed
> 
> Increasing the GLOBALSZ variable to 300MB doesn't help:
> 
>     xyzzy:Src kt$ GLOBALSZ=327650; export GLOBALSZ; gplc -o program blatz.pl
> 
>     Fatal Error: global stack overflow (size: 327652 Kb, reached: 327649 Kb,
>     environment variable used: GLOBALSZ) compilation failed
> 
> Is 10,000 facts a *REAL* limit?  Or am I doing something very wrong?  Ideally
> I'd like to go to about 1,000,000 simple facts.
> 
> I created my input prolog file with this C program:
> 
>     #include <stdio.h>
> 
>     int main(int argc, char *argv[])
>     {
>         FILE *fp = fopen(argv[1], "w");
> 
>         for (int i = 0; i < 10000; ++i)
>         {
>             fprintf(fp, "is_a_widget('GUID:Widget-%07d').\n", i);
>         }
> 
>         fclose(fp);
> 
>         return 0;
>     }
> 
> Thanks,
>     Mark Roulo
> _______________________________________________
> Users-prolog mailing list
> [email protected]
> https://lists.gnu.org/mailman/listinfo/users-prolog

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Paulo Moura
Logtalk developer

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