hpath/benchmarks/Bench.hs

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2016-05-09 11:31:20 +00:00
{-# LANGUAGE ForeignFunctionInterface #-}
{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE TupleSections #-}
{-# LANGUAGE ViewPatterns #-}
{-# OPTIONS_GHC -Wall #-}
import Control.Applicative
import Control.Monad
import System.Directory
import System.FilePath ((</>))
import System.Posix.ByteString.FilePath
import System.Posix.Directory.ByteString as PosixBS
import System.Posix.Directory.Traversals
import qualified System.Posix.FilePath as PosixBS
import System.Posix.Files.ByteString
import Control.Exception
import qualified Data.ByteString.Char8 as BS
import System.Environment (getArgs, withArgs)
import System.IO.Error
import System.IO.Unsafe
import System.Process (system)
import Criterion.Main
-- | Based on code from 'Real World Haskell', at
-- http://book.realworldhaskell.org/read/io-case-study-a-library-for-searching-the-filesystem.html#id620419
listFilesRecursive :: FilePath -> IO [FilePath]
listFilesRecursive topdir = do
names <- System.Directory.getDirectoryContents topdir
let properNames = filter (`notElem` [".", ".."]) names
paths <- forM properNames $ \name -> do
let path = topdir </> name
isDir <- doesDirectoryExist path
if isDir
then listFilesRecursive path
else return [path]
return (topdir : concat paths)
----------------------------------------------------------
getDirectoryContentsBS :: RawFilePath -> IO [RawFilePath]
getDirectoryContentsBS path =
modifyIOError ((`ioeSetFileName` (BS.unpack path)) .
(`ioeSetLocation` "getDirectoryContentsBS")) $ do
bracket
(PosixBS.openDirStream path)
PosixBS.closeDirStream
loop
where
loop dirp = do
e <- PosixBS.readDirStream dirp
if BS.null e then return [] else do
es <- loop dirp
return (e:es)
-- | similar to 'listFilesRecursive, but uses RawFilePaths
listFilesRecursiveBS :: RawFilePath -> IO [RawFilePath]
listFilesRecursiveBS topdir = do
names <- getDirectoryContentsBS topdir
let properNames = filter (`notElem` [".", ".."]) names
paths <- forM properNames $ \name -> unsafeInterleaveIO $ do
let path = PosixBS.combine topdir name
isDir <- isDirectory <$> getFileStatus path
if isDir
then listFilesRecursiveBS path
else return [path]
return (topdir : concat paths)
----------------------------------------------------------
benchTraverse :: RawFilePath -> IO ()
benchTraverse = traverseDirectory (\() p -> BS.putStrLn p) ()
main :: IO ()
main = do
args <- getArgs
let (d,otherArgs) = case args of
[] -> ("/usr/local",[])
x:xs -> (x,xs)
withArgs otherArgs $ defaultMain
[ bench "traverse (FilePath)" $ nfIO $ listFilesRecursive d >>= mapM_ putStrLn
, bench "traverse (RawFilePath)" $ nfIO $ listFilesRecursiveBS (BS.pack d) >>= mapM_ BS.putStrLn
, bench "allDirectoryContents" $ nfIO $ allDirectoryContents (BS.pack d) >>= mapM_ BS.putStrLn
, bench "allDirectoryContents'" $ nfIO $ allDirectoryContents' (BS.pack d) >>= mapM_ BS.putStrLn
, bench "traverseDirectory" $ nfIO $ benchTraverse (BS.pack d)
, bench "unix find" $ nfIO $ void $ system ("find " ++ d)
]