Next: xoroshiro128+ Generator, Up: Random Number Generation [Contents][Index]
Note: This generator is deprecated in favor of the
xoroshiro128+generator (see xoroshiro128+ Generator) which is faster and uses less memory.
On all platforms, the random number is MT-19937 generator as indicated by
:rand-mt19937 being in *features*. This is a Lisp
implementation of the MT-19937 generator of Makoto Matsumoto and
T. Nishimura. We refer the reader to their paper2 or to
their
website.
When CMUCL starts up, *random-state* is initialized by
reading 627 words from /dev/urandom, when available. If
/dev/urandom is not available, the universal time is used to
initialize *random-state*. The initialization is done as given
in Matsumoto’s paper.
“Mersenne Twister: A 623-Dimensionally Equidistributed Uniform Pseudorandom Number Generator,” ACM Trans. on Modeling and Computer Simulation, Vol. 8, No. 1, January 1998, pp.3–30