[Haskell-cafe] memory issues
daniel.is.fischer at web.de
Fri Feb 27 19:10:44 EST 2009
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
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
main = do
args <- getArgs
content <- B.readFile (args!!0)
hout <- openFile (args!!1) WriteMode
mapM_ (hPrint hout) $ sort $ blocks content
? I find hardly any difference, though.
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