mirror of
https://github.com/composewell/streamly.git
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83 lines
2.9 KiB
Haskell
83 lines
2.9 KiB
Haskell
-------------------------------------------------------------------------------
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-- Investigate specific benchmarks more closely in isolation, possibly looking
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-- at GHC generated code for optimizing specific problematic cases.
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-------------------------------------------------------------------------------
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{-# LANGUAGE ScopedTypeVariables #-}
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import qualified Streamly.Streams.StreamD as S
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import Gauge
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maxValue :: Int
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maxValue = 100000
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{-# INLINE sourceUnfoldrM #-}
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sourceUnfoldrM :: Monad m => S.Stream m Int
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sourceUnfoldrM = S.unfoldrM step 0
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where
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step cnt =
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if cnt > maxValue
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then return Nothing
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else return (Just (cnt, cnt + 1))
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{-# INLINE sourceUnfoldrMN #-}
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sourceUnfoldrMN :: Monad m => Int -> S.Stream m Int
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sourceUnfoldrMN n = S.unfoldrM step n
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where
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step cnt =
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if cnt > n
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then return Nothing
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else return (Just (cnt, cnt + 1))
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-------------------------------------------------------------------------------
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-- take-drop composition
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-------------------------------------------------------------------------------
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takeAllDropOne :: Monad m => S.Stream m Int -> S.Stream m Int
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takeAllDropOne = S.drop 1 . S.take maxValue
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-- Requires -fspec-constr-recursive=5 for better fused code
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-- The number depends on how many times we compose it
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{-# INLINE takeDrop #-}
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takeDrop :: Monad m => S.Stream m Int -> m ()
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takeDrop = S.runStream .
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takeAllDropOne . takeAllDropOne . takeAllDropOne . takeAllDropOne
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-------------------------------------------------------------------------------
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-- dropWhileFalse composition
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-------------------------------------------------------------------------------
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dropWhileFalse :: Monad m => S.Stream m Int -> S.Stream m Int
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dropWhileFalse = S.dropWhile (> maxValue)
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-- Requires -fspec-constr-recursive=5 for better fused code
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-- The number depends on how many times we compose it
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{-# INLINE dropWhileFalseX4 #-}
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dropWhileFalseX4 :: Monad m => S.Stream m Int -> m ()
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dropWhileFalseX4 = S.runStream
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. dropWhileFalse . dropWhileFalse . dropWhileFalse . dropWhileFalse
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-------------------------------------------------------------------------------
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-- iteration
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-------------------------------------------------------------------------------
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{-# INLINE iterateSource #-}
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iterateSource
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:: Monad m
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=> (S.Stream m Int -> S.Stream m Int) -> Int -> Int -> S.Stream m Int
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iterateSource g i n = f i (sourceUnfoldrMN n)
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where
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f (0 :: Int) m = g m
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f x m = g (f (x - 1) m)
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-- Keep only the benchmark that is to be investiagted and comment out the rest.
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-- We keep all of them enabled by default for testing the build.
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main :: IO ()
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main = do
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defaultMain [bench "take-drop" $ nfIO $ takeDrop sourceUnfoldrM]
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defaultMain [bench "dropWhileFalseX4" $
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nfIO $ dropWhileFalseX4 sourceUnfoldrM]
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defaultMain [bench "iterate-mapM" $
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nfIO $ S.runStream $ iterateSource (S.mapM return) 100000 10]
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