05-05-2009
Quote:
Originally Posted by
otheus
But maybe there was a random fuzz factor involved.
Exactly this was the case and it is one of the great ideas of IIRC Bob Metcalfe to have done so. The "fuzz factor" was a random number by which the increasing number was multiplicated. Thus two colliding nodes probably weren't colliding at their next try, because the randon numbers would be most probably different.
"Pure" ALOHA (the first CSMA network) without timeslots operated at a ~18% throughput / raw bandwith ratio, whereas "slotted" ALOHA (with timeticks) roughly doubled that efficiency. Ethernet (the successor of ALOHA) had an even higher efficieny.
bakunin
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LEARN ABOUT OPENSOLARIS
srand
rand(3UCB) SunOS/BSD Compatibility Library Functions rand(3UCB)
NAME
rand, srand - simple random number generator
SYNOPSIS
/usr/ucb/cc [ flag ... ] file ...
int rand();
int srand(seed)
unsigned seed;
DESCRIPTION
rand() uses a multiplicative congruential random number generator with period 2^32 to return successive pseudo-random numbers in the range
from 0 to 2^31 -1.
srand() can be called at any time to reset the random-number generator to a random starting point. The generator is initially seeded with a
value of 1.
SEE ALSO
cc(1B), drand48(3C), rand(3C), random(3C)
NOTES
Use of these interfaces should be restricted to only applications written on BSD platforms. Use of these interfaces with any of the system
libraries or in multi-thread applications is unsupported.
The spectral properties of rand() leave a great deal to be desired. drand48(3C) and random(3C) provide much better, though more elaborate,
random-number generators.
The low bits of the numbers generated are not very random; use the middle bits. In particular the lowest bit alternates between 0 and 1.
SunOS 5.11 30 Oct 2007 rand(3UCB)