[R-sig-hpc] Quick rsprng questions
Thomas.H.Hampton at Dartmouth.edu
Thu Jul 30 22:35:00 CEST 2009
We recently installed rsprng on our beowulf cluster. My recollection
R routines like sample() gave weird results before we did this --
you could sample as many times as you like and you would get the same
result, as if
you were setting the seed to some fixed value (even when you did not).
I am not observing this behavior now.
My questions are these.
First, is it a normal feature of clusters to show odd random number
you do not have something like rsprng in there?
Second, if you install rspring, does the problem just magically go
away, or do you need
to make special calls in your R code to take advantage of rsprng?
Finally, why (roughly) is random number generation different in the
parallel environment to begin with?
Thanks very much,
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