How "real time" is FreeBSD?
jerrymc at msu.edu
Thu Sep 21 08:56:03 PDT 2006
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:
> > >
> > > >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
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
They have all kinds of calculus and successive approximations
in their models. The more CPU they have, the more they add
to the design.
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