cycle
<unit> A basic unit of computation, one period of a computer clock.
Each instruction takes a number of clock cycles. Often the computer can access
its memory once on every clock cycle, and so one speaks also of "memory cycles".
Every hacker wants more cycles (noted hacker Bill Gosper describes himself as a
"cycle junkie"). There are only so many cycles per second, and when you are
sharing a computer the cycles get divided up among the users. The more cycles
the computer spends working on your program rather than someone else's, the
faster your program will run. That's why every hacker wants more cycles: so he
can spend less time waiting for the computer to respond.
The use of the term "cycle" for a computer clock period can probably be traced
back to the rotation of a generator generating alternating current though
computers generally use a clock signal which is more like a square wave.
Interestingly, the earliest mechanical calculators, e.g. Babbage's Difference
Engine, really did have parts which rotated in true cycles.
[Jargon File]
(1997-09-30)
Nearby terms:
CYBIL « Cyc « CYCL « cycle » cyclebabble »
cycle crunch » cycle drought
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