Re: [Haskell-cafe] Re: String vs ByteString

On Sunday 15 August 2010 20:04:01, Bryan O'Sullivan wrote:

On Sat, Aug 14, 2010 at 6:05 PM, Bryan O'Sullivan wrote:

...

- If it's not good enough, and the fault lies in a library you chose, report a bug and provide a test case.

As a case in point, I took the string search benchmark that Daniel shared on Friday, and boiled it down to a simple test case: how long does it take to read a 31MB file?

GNU wc -m:

- en_US.UTF-8: 0.701s

text 0.7.1.0:

- lazy text: 1.959s - strict text: 3.527s

darcs HEAD:

- lazy text: 0.749s - strict text: 0.927s

That's great. If that performance difference is a show stopper, one shouldn't go higher-level than C anyway :) (doesn't mean one should stop thinking about further speed-up, though) Out of curiosity, what kind of speed-up did your Friday fix bring to the searching/replacing functions?