On Mon, Feb 9, 2009 at 12:49 PM, Ketil Malde
Reading the binary file is very efficient thanks to Data.Binary. However, output is a different matter. Currently, my code looks something like:
summarize :: Foo -> ByteString summarize f = let f1 = accessor f f2 = expression f : in B.concat [f1,pack "\t",pack (show f2),...]
which isn't particularly elegant, and builds a temporary ByteString that usually only get passed to B.putStrLn. I can suffer the inelegance were it only fast - but this ends up taking the better part of the execution time.
Is building the strict ByteString what takes the most time? If so, you might want to use `writev` to avoid extra copying. Does your data support incremental processing so that you could produce output before all input has been parsed? Cheers, Johan