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123 lines
4.2 KiB
Haskell
123 lines
4.2 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 FlexibleContexts #-}
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{-# LANGUAGE ScopedTypeVariables #-}
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import Streamly (SerialT)
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import Streamly.Internal.Data.SVar (MonadAsync)
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import qualified Streamly.Memory.Array as A
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import qualified Streamly.FileSystem.Handle as FH
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import qualified Streamly.Internal.FileSystem.Handle as IFH
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import qualified Streamly.Data.Fold as FL
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import qualified Streamly.Internal.Prelude as Internal
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import qualified Streamly.Prelude as S
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import qualified Streamly.Internal.Data.Stream.StreamK as K
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import Data.Char (ord)
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import Gauge
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import System.IO (hSeek, SeekMode(..), openFile, IOMode(..))
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import System.Random
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maxValue :: Int
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maxValue = 100000
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-- type Stream = K.Stream
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type Stream = SerialT
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{-# INLINE sourceUnfoldrM #-}
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sourceUnfoldrM :: MonadAsync m => 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 :: MonadAsync m => Int -> 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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{-# INLINE sourceUnfoldr #-}
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sourceUnfoldr :: Monad m => Int -> Stream m Int
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sourceUnfoldr n = S.unfoldr step n
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where
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step cnt =
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if cnt > n + maxValue
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then Nothing
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else 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 => Stream m Int -> 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 => Stream m Int -> m ()
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takeDrop = S.drain .
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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 => Stream m Int -> 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 => Stream m Int -> m ()
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dropWhileFalseX4 = S.drain
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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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:: MonadAsync m
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=> (Stream m Int -> Stream m Int) -> Int -> Int -> 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 "unfoldr" $ nfIO $
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randomRIO (1,1) >>= \n -> S.drain (sourceUnfoldr n)]
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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.drain $ iterateSource (S.mapM return) 100000 10]
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inText <- openFile "benchmark/text-processing/gutenberg-500.txt" ReadMode
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defaultMain [mkBenchText "splitOn abc...xyz" inText $ do
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(S.length $ Internal.splitOnSeq (A.fromList $ map (fromIntegral . ord)
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"abcdefghijklmnopqrstuvwxyz") FL.drain
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$ IFH.toBytes inText) >>= print
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]
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where
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mkBenchText name h action =
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bench name $ perRunEnv (hSeek h AbsoluteSeek 0) (\_ -> action)
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