[Haskell-cafe] Efficient string output
duncan.coutts at worc.ox.ac.uk
Mon Feb 9 07:38:21 EST 2009
On Mon, 2009-02-09 at 12:49 +0100, Ketil Malde wrote:
> 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:
Have you considered using Data.Binary to output the data too? It has a
pretty efficient underlying monoid for accumulating output data in a
buffer. You'd want some wrapper functions over the top to make it a bit
nicer for your use case, but it should work and should be quick.
It generates a lazy bytestring, but does so with a few large chunks so
the IO will still be quick.
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