Charlie Jones (jonesc++at++orlando.veda.com)
Wed, 13 Jan 1999 12:36:39 -0500
Angus Dorbie wrote:
> I suppose that depends on what you mean by real-time.
>
> It's just ridiculous to suggest that true real-time is possible in the
> face of known facts about the NT OS, for example interrupt latency of up
> to 2ms, as anyone will tell you this is hopeless. Vanilla NT is hugely
> NON real time, if you get by with it (as you say) then I suggest that
> your requirements don't merit a real-time OS. That's an engineering
> fact.
>
> This still doesn't address scheduling issues. Even simple stuff like
> processor lockdown, runon, interrupt direction or high resolution
> timers, NONE of this exists. None, zip, so you can't claim with any
> credibility that it supports real-time.
>
> To say NT is the future of real-time is surprising given it's current
> deficient state in the most basic areas and the size of that market
> compared to, say, SOHO use. Looking at the capabilities today, not some
> pipe dream in the mind of an advocacy employee at Microsoft the opposite
> is obviously the case.
>
> Your statement is based on blind faith. Based on what's possible today
> NT just doesn't meet real-time requirements, that may change, for the
> better or the worse. Let's wait & see, it sure isn't an option today.
>
> Cheers,Angus.
>
> Phil Yanni wrote:
> >
> > et. al.,
> > Having started on an SGI PI machine and then a VGX, I truly believed for a
> > long time that you needed IRIX to do anything in realtime. Having said
> > that, we currently are running flight control, Flight Management,
> > Navigation management, and a Moving Map on a Lowly Pentium 166Mhz machine
> > using "standard" NT.
> >
> > There are real time extensions and there is "Embedded NT", but we have
> > never found the need for them.
> >
> > NT is the future of realtime systems so we had best all get on the
> > bandwagon or start looking for other jobs.
> >
> > -Phil Yanni
> > -ANZUS Inc
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