Re: [Haskell-cafe] cost of modules

Thanks ! Il giorno Mar 28, 2007, alle ore 12:04 AM, Tim Chevalier ha scritto:

On 3/27/07, Jeremy Shaw wrote:

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At Tue, 27 Mar 2007 23:10:21 +0200, Fawzi Mohamed wrote:

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If someone has an idea on how else I can improve timings please tell me.

I believe you are seeing a speed decrease, because GHC is not inlining functions as much when you split them into modules. If you add explicit inline statements, I think you should be able to get back to your original timings.

It could be inlining or it could be other optimizations. From the data the OP gives, I don't think it's possible to conclude which ones.

I did longer runs (all compiled with -O2 as before) with the same results. and indeed with a couple of {-# INLINE function #-} I was able to recover the previous performance and actually even get a better performace than before. Thanks! An interesting thing is that the profiler actully was saying that the non inlined version (and for the matter also the the split version) were faster than the inlined or single module versions. It would seem that the profiling ovehead for the inlined functions are not correctly accounted for, so that they appear as more expensive than the plain version when profiling. Fawzi