On 03/07/07, Anatoly Yakovenko
inlining some of the functions definitely gave me a boost, so i am about 8.5 times slower then openssl sha1sum. I dont really understand the core output, but after inlining i got a completely different profile output, i am guessing its because the cost of the inlined functions is spread to the callers.
Are you using -auto, or -auto-all? Because it makes a difference to the generated core, and the extent to which inlining takes place. I've noticed that -auto permits more inlining than -auto-all, so try -auto if you can. Also, follow the advice in the GHC manual, and only export the functions you need to. This will aid both the inliner and specialiser enormously. As for reading core (well, actually simplifier output; core has less "punctuation"), these links might help: 4.16.3. How to read Core syntax http://www.haskell.org/ghc/docs/latest/html/users_guide/options-debugging.ht... (and the Encoding module has the actual rules for the Unique names) http://darcs.haskell.org/ghc/compiler/utils/Encoding.hs 6.2. Faster: producing a program that runs quicker http://www.haskell.org/ghc/docs/latest/html/users_guide/faster.html (see "How do I find out a function's strictness?") Alistair