Am Samstag, 28. Februar 2009 00:37 schrieb Bulat Ziganshin:
Hello Daniel,
Saturday, February 28, 2009, 2:21:31 AM, you wrote:
printf "%s" $ unlines $ map (show) (sort $! blocks content)
Bad! Use mapM_ print $ sort $ blocks content
are you sure?
Tested it. The printf "%s" is very bad. Replacing that reduced allocation and GC time by a factor of 2+. The difference between mapM_ print and putStr $ unlines $ map show $ ... is too small for me to be sure that mapM_ print is really better.
print may waste a lot of time, locking stdout for every line printed
Hm, maybe main = do args <- getArgs content <- B.readFile (args!!0) hout <- openFile (args!!1) WriteMode mapM_ (hPrint hout) $ sort $ blocks content hClose hout ? I find hardly any difference, though.