> > I tend to deal a lot with very very large data files in Haskell and my > current approach to dealing with getting data out of one program an into > another is writing it to a file using 'show' and then reading it in using > 'read'. Unfortunately, this is very slow and produces very large files > which are very slow to read and write.
Be careful with your choice of Read and Show instances. Standard reading of lists is ``strict in the closing bracket'', so the first element is only returned after the end of the list has been read. I tend to define my own instances, using a fairly standard set of parser combinators working on the ReadS type --- this speeds up things considerably (and runs in less memory). This can, of course, also be used to get file size down, but in my circumstances this was not a major problem (rarely had files of more than a few tens of megabytes), and human-readability was useful to have. Wolfram _______________________________________________ Glasgow-haskell-users mailing list [EMAIL PROTECTED] http://www.haskell.org/mailman/listinfo/glasgow-haskell-users
