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RE: The Airplane Example (was Re: Streaming XML)

• To: 'Rick Marshall' <rjm@z...>, Elliotte Harold <elharo@m...>
• Subject: RE: The Airplane Example (was Re: Streaming XML)
• From: "Bullard, Claude L (Len)" <len.bullard@i...>
• Date: Wed, 5 Jan 2005 16:19:19 -0600
• Cc: XML Developers List <xml-dev@l...>

You identified an emergent property:  a variable that 
controls the behavior of the system.

http://www.econ.iastate.edu/classes/econ308/tesfatsion/bat3a.htm

Heat or temperature is the collective variable.  Dust is an 
externality.

XML-Dev is becoming home to the best amateur chaos/complexity 
theorists on the web.  And that is not surprising considering 
the problem markup set out to solve.

len


From: Rick Marshall [mailto:rjm@z...]

electronics 101 - the main cause of electronics failure is heat induced 
degrading of transistor gates (the doping materials under thermal stress 
move around narrowing the gate to the point of failure). this applies as 
much to microwaves as it does to microprocessors.

the main reason modern devices are more reliable is that we are winning 
the heat war - lower voltages = less heat for given performance. more 
gates means more heat. hence cpu fans etc. so long as the cpu fan keeps 
working - providing adequate cooling - a modern pc will run for years 
trouble free. keep the dust from your bearings and suspect the cpu when 
software starts playing up - replace the fan.

i have reliability problems from some point of sale software because the 
pc's get housed in enclosed spaces and cook themselves. but the pc dies 
slowly so it looks at first like bizarre software faults, but in reality 
it's random temporary circuit failures in the cpu. we debug the software 
by fixing the cooling!

maybe we need holistic software development as a discipline ;)

rick

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