IIRC you just replace the current functions with yours and run make in
the benchmarks/ directory to compile the benchmark binaries (which use
Criterion). Then simply run them.
On Wed, Jan 18, 2012 at 8:06 AM,
On Tue, 17 Jan 2012, Johan Tibell wrote:
Try it out on the Criterion benchmarks in the source repo. I'd be curious to see the results.
Okay, I never intended to try and replace the existing operations with a lens based one, but now you've got me curious to try.
Here is my fastLens implementation:
fastLens :: Key -> IntMap a -> (IntMap a -> (a -> IntMap a) -> a -> c) -> (IntMap a -> (a -> IntMap a) -> c) -> c fastLens k = k `seq` go where go t@(Bin p m l r) c1 c2 | nomatch k p m = c2 t (\x -> join k (Tip k x) p t) | zero k m = go l (updateContL c1) (updateContL c2) | otherwise = go r (updateContR c1) (updateContR c2) where updateContL c dl il = c (bin p m dl r) (\x -> bin p m (il x) r) updateContR c dr ir = c (bin p m l dr) (\x -> bin p m r (ir x)) go t@(Tip ky y) c1 c2 | k == ky = c1 Nil (Tip ky) y | otherwise = c2 t (\x -> join k (Tip k x) ky t) go Nil _ c2 = c2 Nil (Tip k)
lookup :: Key -> IntMap a -> Maybe a lookup k t = fastLens k t (\_ _ -> Just) (\_ _ -> Nothing)
insert :: Key -> a -> IntMap a -> IntMap a insert k x t = fastLens k t (\_ it _ -> it x) (\_ it -> it x)
delete :: Key -> IntMap a -> IntMap a delete k t = fastLens k t (\dt _ _ -> dt) (\dt _ -> dt)
update :: (a -> Maybe a) -> Key -> IntMap a -> IntMap a update f k t = fastLens k t (\dt it x -> maybe dt it (f x)) (\dt _ -> dt)
alter :: (Maybe a -> Maybe a) -> Key -> IntMap a -> IntMap a alter f k t = fastLens k t (\dt it x -> maybe dt it (f (Just x))) (\dt it -> maybe dt it (f Nothing))
lens :: Key -> IntMap a -> (Maybe a -> IntMap a, Maybe a) lens k t = fastLens k t (\dt it x -> (maybe dt it,Just x)) (\dt it -> (maybe dt it,Nothing))
(See also: https://github.com/roconnor/containers/tree/FastLens)
How do I use criterion to benchmark this?
-- Russell O'Connor http://r6.ca/ ``All talk about `theft,''' the general counsel of the American Graphophone Company wrote, ``is the merest claptrap, for there exists no property in ideas musical, literary or artistic, except as defined by statute.''