dons at galois.com
Tue Jun 24 15:50:45 EDT 2008
> I've got a library that I'm in the process of uploading to hackage
> (waiting for account) but the darcs repo is here:
> I notice a slight drop in performance when I install the library using
> cabal. Maybe 10-20%, on one particular function. This is in comparison to
> when the library is 'local', as in, the source files are in the same
> directory as the client application.
Lack of unfolding and inlining when compiled in a package? Try compiling
with -O2, for maximum unfolding.
> What could be causing the performance drop? The function in question
> requires impractical amounts of inlining (This is something of an
> experiment), but I don't see how installing it as a library affects that.
> The functions to be inlined are small, surely available in the .hi files.
You can check this via -show-iface
> Its only when they are applied do they agglomerate into a big mess -
> 80-200K lines of core.
> The function in question is invertMany in examples/Examples.hs.
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