Dealing with large files in Haskell

Question

I have a large file (4+ gigs) of, lets just say, 4 byte floats. I would like to treat it as List, in the sense that I would like to be able to use map, filter, foldl, etc. Howev

Answer 1

You might use mmap to map the file to memory and then process it. There is a mmap module that promises to read and write mmaped files and can even work with lazily mapped chunks of files, but I haven't tried it.

The interface for writing to the mapped file seems to be quite low level, so you'd have to build your own abstractions or work with Foreign.Ptr and the like.