[Haskell-cafe] stream/bytestring questions

Don Stewart dons at galois.com
Sun Feb 17 20:04:41 EST 2008

> On Feb 17, 2008 4:13 PM, Brandon S. Allbery KF8NH <allbery at ece.cmu.edu> wrote:
> > Have you looked at the stream-fusion package on Hackage?
> > http://hackage.haskell.org/cgi-bin/hackage-scripts/package/stream-
> > fusion-0.1.1
> Yeah, I've seen this. It's nice that this is separated, but a little
> unsatisfying that the bytestring library reimplements it rather than
> just requiring it as a dependency. This, and the fact that bytestrings

they currently use two different fusion systems. bytestring uses an
older version of what is now stream fusion. at some point we'll switch
bytestrings over to using the new stuff in the stream-fusion package,
since its a lot better.

> are way fast, while the stream-fusion stuff is sometimes slower than
> just using lists, make me think that either (1) there's sometimes an
> advantage in programming directly to streams, or (2) maybe more of the
> stream functions need to be exposed in the API. Or maybe there's
> another reason... that's part of my question.

ah, you assume stream-fusion lists are slower. for list stuff, since
6.8, i've only seen things the same speed or better. but if you have a
program doing the wrong thing, it would be worth looking at.

-- Don

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