ill-behaved definition
1. [numerical analysis] Said of an algorithm or
computational method that tends to blow up because of
accumulated roundoff error or poor convergence properties.
2. Software that bypasses the defined operating system
interfaces to do things (like screen, keyboard, and disk I/O)
itself, often in a way that depends on the hardware of the
machine it is running on or which is nonportable or
incompatible with other pieces of software.
In the IBM PC/mess-dos world, there is a folk theorem
(nearly true) to the effect that (owing to gross inadequacies
and performance penalties in the OS interface) all interesting
applications are ill-behaved.
See also bare metal. Opposite: well-behaved, compare
PC-ism.
[Jargon File]
Nearby terms:
ILIAD « I-Link « ILISP « ill-behaved » ILLIAC » Illiac IV » ILOC
ILLIAC definition
Assembly language for the ILLIAC computer. Listed in CACM
2(5):16, (May 1959) p.16.
Nearby terms:
I-Link « ILISP « ill-behaved « ILLIAC » Illiac IV » ILOC » Ilog Solver
Illiac IV definition
<computer> One of the most infamous supercomputers ever. It
used early ideas on SIMD (single instruction stream,
multiple data streams). The project started in 1965, it used
64 processors and a 13MHz clock. In 1976 it ran its first
sucessfull application. It had 1MB memory (64x16KB).
Its actual performance was 15 MFLOPS, it was estimated in
initial predictions to be 1000 MFLOPS. It totally failed as a
computer, only a quarter of the fully planned machine was ever
built, costs escalated from the $8 million estimated in 1966
to $31 million by 1972, and the computer took three more years
of enginering before it was operational.
The only good it did was to push research forward a bit,
leading way for machines such as the Thinking Machines
CM-1 and CM-2.
(1995-04-28)
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