2^64 bytes is enough for any human
Posted Apr 27, 2004 21:01 UTC (Tue) by slamb
In reply to: 2^64 bytes is enough for any human
Parent article: The Grumpy Editor goes 64-bit
The point is not whether or not it would be useful to have an accurate model of the
universe, but that it is impossible. Clearly you can't do better than (or even as well as)
harnessing the largest set of good quantum numbers of every particle in the universe. (Your
computer has to be in the universe!) So by examining the number of particles in the
universe, you can come up with a number that is larger than the maximum possible storage
space of a computer. Take the base-2 log and you've got an
inexhaustible address space.
I've seen discussions of this number before, but I don't remember the result. But I seem to
recall it being less than 2^128; thus, a 128-bit address space is good enough for anyone. Really.
There are other arguments based on thermodynamics limiting the complexity of a computer.
Google for discussions of thermodynamics and reversible vs. irreversible computers and you'll
see what I mean.
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