From: Dave Thomas <Dave@...>
Date: 2000-12-16T08:10:02+09:00
Subject: [ruby-talk:7361] Re: Ruby performance question

Eric Crampton <EricCrampton@worldnet.att.net> writes:

> I'm (generally) reading more data than could fit in physical memory,
> so that's not really an option.

OK, this is tacky, and probably not worth it, but it knocks about 15%
of the run times on my box, using an 80,000 line input file with 6
key/value pairs per line. The idea is simply to avoid creating the
intermediate object that contains a single key-value which is then
split across the '='. Instead, we assume the input is well-formed and
split into the final strings directly.


     h = Hash.new

     while line = gets
       a = line.chomp!.tr!('=', ',').split(',')
       0.step(a.size-2, 2) do |i|
         h[a[i]] = a[i+1]
       end
       h.clear
     end


Ugly, eh?