Subject Re: [firebird-support] Running 32 bit 1.5 classic on 64 bit SBS 2008
Author Mark Rotteveel
> I have a customer using SBS 2008, with 16 MB ram, 7.6MB which is
> currently in use.

I assume you mean GB, not MB. I think I had my last machine with 16 MB RAM somewhere around 1996 ;)

> Their previous server was an XP machine, and was much faster.
> (instantaneous compared to now waiting 18 seconds for an invoice to be
> sent) We have gone through all the usual -anti-virus, volume shadowing,
> etc.

Could it be that the DNS resolution has been changed? I have seen problems with DNS or reverse DNS resolution causing high delays.

Is a different mailserver used (I assume here you mean sending invoices by mail)? Was the configuration of the mailserver changed (I have seen situations where a misconfiguration of the mailserver caused delays in sending mails upto 30 seconds after which the send aborted on a configured timeout).

> Question: as far as I understand, there is a 4gig limit on 32 bit
> applications. So, if they have 16MB ram, and the first 4GIG is used up,
> would that explain why their system is so slow?

No, the limit is (max) 2 GB per 32 bit process. I actually do not know if Windows 64 uses only one 32 bit Windows-on-Windows subsystem in total, or one per process. If it is one in total, then the limit will probably be 3GB in total. Otherwise (one WoW subsystem per process) it will probably allow full use of memory.

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