parallel random number generation #99

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piccolbo opened this Issue May 16, 2012 · 1 comment

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piccolbo commented May 16, 2012

One aspect that is important to make parallelization easier in a language like R is parallel random generation. If we do a

sapply(1:100, function(i) rnorm(1))

we have certain guarantees about the distribution of the vector thus created. But if you do a

mapreduce(to.dfs(1:100), function(k,v) keyval(NULL, rnorm(1))

we need to switch to parallel number generation, maybe transparently to the user, maybe as an easy switch. Would unique seeding per task attempt do the trick?

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