Subject RE: Re[2]: [ib-support] FB Hyper Threading and Performance
Author Richard Pendered
Well, Win2K AS supports HyperThreading as well. Like XP it sees each CPU as
2 CPUs ie 2xhyperthread CPUs = 4 logical CPUs to the OS

-----Original Message-----
From: Phil Shrimpton [mailto:phil@...]
Sent: 28 February 2003 08:48
Subject: Re: Re[2]: [ib-support] FB Hyper Threading and Performance

On Friday 28 February 2003 10:29, you wrote:


> >If you are using the SS version of FB (or < IB7) on Windows 2000 and
> > below, you will need to disable hyperthreading in the Bios.
> Can I set processor affinity instead of disabling hyperthreading?

No, because it will only set the FB process to one 'physical' CPU, not one
the two 'logical' CPU's

> Sorry, if this question is irrelevant but I have no experience with
> hyperthreading and actually I don't know how the OS exposes 'both'
> CPUs.

If the OS supports HT it should treat a HT CPU as two 'normal' CPU's. In
OS's that don't support HT, it is a bit of a hit and miss affair, sometimes
they are treated as one, sometimes two. XP is the first Windows OS that
supports HT, but apparently there are still a few issues.


Linux 2.4.4-4GB
8:43am up 45 days, 14:32, 1 user, load average: 0.22, 0.05, 0.01

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