What about NT?

My largest customer has just blown 256!

JAC.

----- Original Message -----
From: Jim Starkey <jas@...>
To: <IB-Architect@egroups.com>; <IB-Architect@egroups.com>
Sent: 05/07/2000 4:54 PM
Subject: Re: [IB-Architect] Interbase connection limit and Support related
Problems


> At 04:53 PM 7/5/00 +0200, Andre Mostert wrote:
> >
> >Interbase should be able to support more than 256 connections. The most
> >disconcerting fact is that in the last two weeks we
> >have emailed Ann Harrison and copied Paul Beach twice just to ascertain
what
> >progress has been made or when we can expect
> >resolution to our problem. We have not enjoyed the curteousy of a reply.
We
> >realize that you are busy with ver 6 and probably
> >with preparations for the conference. We however are sitting with 18
centres
> >on our new app, and the balance awaiting
> >resolution from Interbase and our software house.
> >
>
> I'll let Ann handle the business issues and take on the architectural
> ones.
>
> You're not going to like the answer, but the problem is Sun's. InterBase
> can work around the Sun's problem, but only Sun has the ability to
> fix it.
>
> Here is the problem (from /usr/include/stdio.h):
>
> /* @(#)stdio.h 1.16 89/12/29 SMI; from UCB 1.4 06/30/83 */
>
> # ifndef FILE
> #define BUFSIZ 1024
> #define _SBFSIZ 8
> extern struct _iobuf {
> int _cnt;
> unsigned char *_ptr;
> unsigned char *_base;
> int _bufsiz;
> short _flag;
> char _file; /* should be short */
> } _iob[];
>
> The field _file holds the FD (file descriptor). On Solaris (like
virtually
> all Unix systems), sockets and file descriptors come out of the same
> number space, and are assigned sequentially, starting with 0. A
> "char" field can only hold a number up to 255 (127 if you want to
> be picky). If you start with stdin, stdout, and stderr tying down
> 0, 1, and 2, add a database file, that leaves a max of 252 connections
> before the next file open overflows _file and the world ends.
>
> The obvious workaround is to use a less-stupid set of buffered
> IO functions, which the InterBase guys tried. A little painful, but
> given a choice of open source file handling subsystems, completely
> feasible. This was an imperfect solution as some other limit
> (to the best of my knowledge, undiagnosed).
>
> The bottom line is that exceeded in the inherant limitations of the
> underlying operating systems is a tricky problem. Since anybody
> using the standard Sun libraries is stuck with the 255 file/socket
> limit, who knows what else is going to break.
>
> Since this is an architectural and not a support list, I will just
> point out that HPUX uses two bytes for the file descriptor and
> Linux a full int.
>
>
>
> Jim Starkey
>
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