Re: [Haskell-cafe] Performance problem with random numbers

On Sat, 2007-10-13 at 09:56 -0400, Brandon S. Allbery KF8NH wrote:

Now you need to start forcing things; given laziness, things tend to only get forced when in IO, which leads to time being accounted to the routine where the forcing happened. If random / randomR are invoked with large unevaluated thunks, their forcing will generally be attributed to them, not to functions within the thunks.

But AFAIK random and randomR only take a StdGen (plus a range argument in case of randomR) as argument so I don't understand where the unevaluated thunks might be actually? (Maybe I should have said that random and randomR are the ones from GHC's System.Random module.) Thanks, Thoralf