On 30/08/2018 20.21, Olaf Klinke wrote:
Hello, Olaf. I have some distrust of elegant solutions (one of them are C.P. libs).
[*] To the parser experts on this list: How much time should a parser take that processes a 50MB, 130000-line text file, extracting 5 values (String, UTCTime, Int, Double) from each line?
Not an expert, but for something as (relatively!) standard as CSV, I'd probably go for a specialized solution like 'cassava', which seems like it does quite well according to https://github.com/haskell-perf/csv Based purely the lines/second numbers on that page and the number you've given, I'd guesstimate that your parsing could potentially be as fast as (3.185ms / 1000 lines) * 130000 lines = 414.05ms = 0.4 s. (Of coure that still doesn't account for extracting the Int, Double, etc., but there are also specialized solutions for that which should be pretty hard to beat, see e.g. bytestring-lexing.) It's also probably a bit less elegant than a generic parsec-like thing, but that's to be expected for a more special-case solution. Regards,