From: BIl Kleb <Bil.Kleb@...>
Date: 2009-02-25T15:44:15+09:00
Subject: Re: 1.9.1 regex 6.5 times slower than 1.8.6 in at least one case

Michael Brooks wrote:
> 
> However, in one case, when using a regular expressions (posted here by 
> someone a long time ago) which I use to determine what numbers in 
> 0..10000 are prime numbers, version 1.9.1 was at least 6.5 times slower 
> (1.8.6 = 67 secs, 1.9.1 = 457 secs).

I found similar results lately, but the difference was more like a
factor of 12!

RUBY 1.8.6:

$ cd FUN3D
$ find . -name \*_c.\?90 -exec rm {} \;
$ time ruby Ruby/complex_transformations_spike.rb
[...]
real    0m25.221s
user    0m22.292s
sys    0m0.759s

$ ruby -v
ruby 1.8.6 (2008-03-03 patchlevel 114) [universal-darwin9.0]
(as comes with OS X)

RUBY 1.9.1:

$ cd /usr/local/src
$ wget ftp://ftp.ruby-lang.org/pub/ruby/1.9/ruby-1.9.1-p0.tar.gz
$ tar zxf ruby-1.9.1-p0.tar.gz
$ cd ruby-1.9.1-p0
$ ./configure --program-suffix=19 --enable-shared
$ make
$ sudo make install
$ cd -

$ time ruby19 Ruby/complex_transformations_spike.rb
[...]
real    5m18.188s
user    4m54.253s
sys    0m2.866s

$ ruby19 -v
ruby 1.9.1p0 (2009-01-30 revision 21907) [i386-darwin9.6.0]

Regards,
--
Bil Kleb
http://fun3d.larc.nasa.gov