Hello Scott, Sunday, December 16, 2007, 11:57:33 PM, you wrote: > My question is: what exactly does GHC.Prim.touch# do? This appears to it's a no-op (for ghc 6.6+ at least). its only task is to notify ghc optimizer that data were accessed so it doesn't free the memory -- Best regards, Bulat mailto:Bulat.Ziganshin at gmail.com