small optimization story

[Luke Gorrie]

James Hague <jamesh@REDACTED> writes:

> Really interesting, Luke!
> 
> I wrote up some similar experiences here:
> 
> http://www.dadgum.com/james/shootout.html

Nice timing :-)

Klacke and I just did a > 5x speedup of some performance critical HTML
generation code. We used fprof and it took about 15 minutes - turned
out to be trivial io_lib:format("~s/~s/") type of things that we just
rewrote as conses. The search space for the bottleneck was rather
large (Yaws + whole application) so profiling probably saved us a
couple of days of work.

The main optimization was in the {ehtml, ...} feature of Yaws, so
everyone else using it can get a nice speedup too (in a minute after,
a checkin..)

We both love fprof now :-)

(Look forward to reading your page when I have a minute!)

Cheers,
Luke