[Haskell-cafe] Re: GHC performance of 64-bit

I noticed that GHC generates slower code on an Linux amd64 bit platform than the 32-bit version on a cheaper 32-bit machine. CPUTime for running sieve of Erathostenes to generate 10,000 primes: Athlon XP 2800 (32-bit): 7.98 secs Athlon 64 3800 (64-bit): 10.29 secs This is using GHC 6.6 on the 64-bit machine and 6.4.1 on the 32-bit one.

I googled around and could not find any information regarding degraded performance of ghc/haskell on 64-bit machines. Any ideas?

Could it be the effect of doubling the size of pretty much everything, leading to poorer memory-hierarchy performance? Stefan