[issue9816] random.jumpahead and PRNG sequence independence
Raymond Hettinger
report at bugs.python.org
Fri Sep 10 12:48:53 CEST 2010
Raymond Hettinger <rhettinger at users.sourceforge.net> added the comment:
I see the problem now. Random.jumpahead(n) does a very poor job of shuffling MT's state when n is small. The first few numbers of the state are different but some of the later ones are not. When random() crawls across parts of the state that are identical, it produces identical output. Later when has wrapped around, the random() calls diverge again.
Fixed by salting the jumpahead value. See r84665.
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resolution: -> fixed
status: open -> closed
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<http://bugs.python.org/issue9816>
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