Hi, So I have a data instance which contains a few big matrices, and I want to save my instance to a file so I can `read` it back later to avoid the long computation every time (I'm training a recurrent neural network). First attempt, the simplest method: writeFile "rnn" (show dataInstance) It starts to take all of the memory and then bails out with `out-of-memory` error. So I wrote a function to write the string chunk by chunk, without buffering, here is the code: https://github.com/mdibaiee/sibe/blob/728df02fbdd6f134af107c098f5477094c61ea... Copy/pasted from the link: saveRecurrent :: FilePath -> String -> Int -> IO () saveRecurrent path str chunkSize = do handle <- openFile path AppendMode hSetBuffering handle NoBuffering loop handle str hClose handle where loop _ [] = return () loop handle s = do hPutStr handle $ take chunkSize s hFlush handle loop handle $ drop chunkSize s But it doesn't work either, I still get `out-of-memory` errors. From what I understand, this should work, but it isn't. I asked on IRC and someone said "Show is not lazy enough", if that's the case, I would appreciate an explanation of that. Thanks, Mahdi