[Haskell-cafe] stream fusion -- multi-module programs
dons at galois.com
Wed Apr 8 12:38:18 EDT 2009
> In the paper "Stream Fusion: From Streams To Lists To Nothing
> At All", we find:
> For large multi-module programs, the results are less clear,
> with just as many programs speeding up as slowing down. We
> ﬁnd that for larger programs, GHC has a tendency to miss
> optimisation op- portunities for stream fusible functions
> across module boundaries, which is the subject of further
> What's the state of these things? Is this still an issue for
> stream fusion?
I think it just needs rerunning in light of all the inliner changes
over the past 2 years. The kinds of programs I write in practice don't
seem to suffer, but I tend not to use concatMap on stream.
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