Subject Re: [firebird-support] Firebird more than one hundred time slower on some win2003 server
Author Daniel Rail

At April 14, 2005, 14:50, henry FRANQUET wrote:

> I have disabled Hyperthreading of the CPU and eureka that's works !

> I knews that in some case, hyperthreading slows windows, but not as
> much

Hyperthreading will slow down Firebird Superserver, and that is a
known fact. But, HT will not slow down FB Classic Server, because
Classic is multi-process(a separate process for each connection) and
not multi-threaded. Although Superserver is multi-threaded, it is not
SMP and/or HT friendly, because FB manages its own threads, and that
somehow clashes with the OS. This problem will disappear with FB 3.0,
because of the current Vulcan project which has a goal of implementing
fine-grained threading into FB(letting the OS manage the thread

If hyperthreading has to be enabled on those servers, simply install
FB Classic Server.

Best regards,
Daniel Rail
Senior Software Developer
ACCRA Consultants Inc. (
ACCRA Med Software Inc. (