ketil:
Hi,
I'm currently working on a program that parses a large binary file and produces various textual outputs extracted from it. Simple enough.
But: since we're talking large amounts of data, I'd like to have reasonable performance.
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.
Why not use Data.Binary for output too? It is rather efficient at output -- using a continuation-like system to fill buffers gradually. -- Don