From: Yukihiro Matsumoto <matz@...>
Date: 2008-02-12T02:51:24+09:00
Subject: Re: very bad character performance on ruby1.9

Hi,

In message "Re: very bad character performance on ruby1.9"
    on Mon, 11 Feb 2008 03:33:54 +0900, "Eric Mahurin" <eric.mahurin@gmail.com> writes:

|I'd like to bring up the issue of how characters are represented in
|ruby 1.9from a performance standpoint.  In a recent ruby-quiz (parsing
|JSON), the
|fastest pure-ruby solution was simply an LL(1) parser that looked at one
|character at a time (it beat various Regexp solutions).  With ruby 1.9, the
|runtime increased by 4X making it a slow solution.  A simple benchmark is at
|the end of this message that counts words in an LL(1) fashion.  With ruby
|1.8.6, it can could the words in Homer's Iliad in 1.46s on my machine and in
|ruby 1.9 (from ubuntu gutsy) it takes 52.87s (36X increase in runtime).

I just checked in some performance tweaking.  The script run still
slower (2.3 times), but much better than 36 times.  It is nice for two
hour job.

|Please consider this significant performance issue in ruby 1.9.

We were primarily working on spec in M17N field.  I think we're about
to start performance tuning on it.

							matz.