Hello, For obscure reasons, I'm running some benchmarks both on an x86 machine (2.20 Ghz, 2 GB of RAM, Linux 2.6.22-15) and on a PowerPC Mac (1 Ghz, 512 MB of RAM, Mac OS 10.5). I noticed that even some pretty simple programs run much slower on the Mac than on the PC. For example, the following program (edited down from the "life" nofib benchmark): ------------------------------------------------- limit xs = go [] xs go acc (x:y:xs) | x==y = acc ++ [x] | otherwise = go (acc ++ [x]) (y:xs) go acc [x] = acc ++ [x] go acc [] = error "limit" main = print (length (limit (iterate (\ x -> if x == 10000 then x else (x+1)) 1))) --------------------------------------------------- runs in about 1.5 seconds on the PC, and 14 seconds on the Mac. This is with ghc -O2, version 6.10.1. The numbers are about the same on either machine whether I use -fvia-C or -fasm. The Mac does have a lot less RAM, but I can see that the program isn't swapping. So is the PPC backend really this bad, or should I be looking for something weird with the hardware or configuration on the Mac? Thanks, Tim -- Tim Chevalier * http://cs.pdx.edu/~tjc * Often in error, never in doubt "I don't like your I-can-use-anything-as-an-adjective attitude." -- Larry Wall