Hello Donald, Thursday, November 2, 2006, 2:21:31 PM, you wrote:
10-20 times difference is typical for GHC programs.
It's really more like 2-4x. Sometimes better than C.
Where's this huge figure coming from Bulat? If you have code that behaves like this, you should report it.
are you analyzed the cases where performance is close or even better? i does. it's either because C version is limited by memory performance or just use different, less efficient algorithm the cases which shows slowness of ghc-generated code is factorial algorithm and the program attached. despite that Haskell code is far uglier, C version outperforms it 20 times. run both programs with arrays of about 10k elements to see the difference: a.out 10000 elements 100000 iterations in February i've written detailed explanation (in ghc-users) of why this comes and made some suggestions on improving it. of course, main problem is ghc's own code generator which is far away from gcc or even ocaml ones -- Best regards, Bulat mailto:Bulat.Ziganshin@gmail.com