[Haskell-cafe] How to deal with huge text file?

Hi, I have a file including some operation logs, in the format of the following. And I have some code to analyze it. Well, it ate all my memories. --- log: Log for item A =========== 09:10 read accountA 09:20 read accountB Log for item B .... --- code: file <- U.readFile filename mapM_ (\text -> let ope = parseOPE text in if findMissingOperation ope then U.putStrLn $ show $ fst ope else return () ) $ seperateOutput file --This function separates the input text file into paragraph by "Log for". -- 竹密岂妨流水过 山高哪阻野云飞