How "real time" is FreeBSD?

[Jerry McAllister]

On Thu, Sep 21, 2006 at 08:21:10AM -0700, backyard wrote:

> --- RW <list-freebsd-2004 at morbius.sent.com> wrote:
> 
> > On Thursday 21 September 2006 06:12, Walt Pawley
> > wrote:
> > > At 11:47 PM -0500 9/20/06, W. D. wrote:
> > > >Just reading this about Linux on ZDNet and was
> > wondering:
> > >
> ><http://news.zdnet.com/2100-9593_22-6117479.html?part=rss&tag=feed&subj=zd
> > > >nn>
> > >
> > > Cybernetic floobydust, IMHO.
> > 
> > If you read what the banker says: " for each
> > thousandth of a second that its 
> > trading software can act faster than competitors'
> > software, the company would 
> > see $100 million a year in new revenue."
> 
> and for every extra trade they do they change the
> stock price faster and faster making them more money.
> They're creating the money by manipulating the market
> faster; the market doesn't create itself... How can
> they even quantify this so called loss when their
> trading is constantly changing the state of the
> market.

Yes, Mr Heisenberg...

> > It seems to me that they are really misunderstanding
> > the problem. What they 
> > need is a system that's fast most of the time,
> > rather than one that meets an 
> > arbitary deadline all the time. In other words they
> > need a fast system, not a 
> > realtime system.
> > 
> 
> I would imagine an extra 100 million would buy quite a
> dusy of a system at that... processing data at a rate
> of 1000 Hz doesn't seem to suggest a real-time system
> is required when the average clock is 1 million times
> faster then that. its not like they're doing FFT's on
> a Radar signal, to determine if its a bogey and arming
> the appropriate countermeasures so they can be
> deployed the second the blip appears on the operators
> screen.

They have all kinds of calculus and successive approximations
in their models.   The more CPU they have, the more they add
to the design.

////jerry

> 
> -brian 
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