Hi, I copied the program below from a reddit post of dons'. I have a dual core laptop with ubuntu hardy and ghc 6.10.1. I can see the difference when I run the program with +RTS -N2 but CPU always says 100%. I'd like an example that shows >100 -- is it not showing >100 because of my timeformat or because of the program? If it's the latter can you point me to an example that will use more cpu? Here's the output: $ cat /proc/cpuinfo | grep processor | wc -l 2 $ export TIMEFORMAT="%E real,%U user,%S sys, %P cpu" $ ghc -O2 --make Par.hs -threaded $ time ./Par 1405006117752879898543142606244511569936384005711076 2.330 real,2.328 user,0.000 sys, 99.92 cpu $ time ./Par +RTS -N2 1405006117752879898543142606244511569936384005711076 1.504 real,2.316 user,0.016 sys, 100.00 cpu Here's the program: ---------------- import Control.Parallel main = a `par` b `par` c `pseq` print (a + b + c) where a = ack 3 10 b = fac 42 c = fib 34 fac 0 = 1 fac n = n * fac (n-1) ack 0 n = n+1 ack m 0 = ack (m-1) 1 ack m n = ack (m-1) (ack m (n-1)) fib 0 = 0 fib 1 = 1 fib n = fib (n-1) + fib (n-2) -------------------- Thanks, Jim -- View this message in context: http://www.nabble.com/Showing-%3E100--CPU-usage-of-parallel-code-tp22137081p... Sent from the Haskell - Haskell-Cafe mailing list archive at Nabble.com.