Bug #696: 1.9.0-0 is more faster in factrial test

• Status: Rejected
• Assignee: ko1 (Koichi Sasada)
• Target version: 2.0.0
• ruby -v: 1.9.1

[ariveira (Alexandre Riveira)]

=begin
Mandelbrot factral test (http://www.timestretch.com/FractalBenchmark.html) in 1.9.1 is more slow than 1.9.0, results:

1.9.0-0 => 2.95
1.9.1-preview1 => 4.09

My hardware: pentium M, 1 GB RAM, Centos 5.2, gcc 4.1.2
=end

[rogerdpack (Roger Pack)]

=begin
http://www.timestretch.com/FractalBenchmark.html
is the link
which SVN versions were you using? [or was that just the releases?]
=end

[ariveira (Alexandre Riveira)]

=begin
I use 1.9.0-0 e 1.9.1-preview1 releases

1.9.0-0 ftp://ftp.ruby-lang.org/pub/ruby/1.9/ruby-1.9.0-0.tar.bz2

1.9.1-preview1 ftp://ftp.ruby-lang.org/pub/ruby/1.9/ruby-1.9.1-preview1.tar.bz2

Alexandre Riveira
=end

[ko1 (Koichi Sasada)]

• Assignee set to ko1 (Koichi Sasada)

=begin

=end

[yugui (Yuki Sonoda)]

• Priority changed from Normal to 3
• Target version changed from 1.9.1 Release Candidate to 2.0.0

=begin

=end

[naruse (Yui NARUSE)]

• Status changed from Open to Rejected
• ruby -v set to 1.9.1

=begin
Not a bug
=end

[mame (Yusuke Endoh)]

=begin
Even if it is not a bug, a ticket must not be rejected as long as there is a
matter to be checked.

I tested the code on some versions of ruby.

• 1.9.0-0 0.040320 sec. (wrong result)
• 1.9.0-5 4.792150 sec.
• 1.9.1-p0 4.996654 sec.
• 1.9.1-p243 9.164635 sec.
• trunk 3.806966 sec.

1.9.0-0 output just empty lines, not mandelbrot set. It seems to be caused
by the following bug (which is already fixed on later versions):

$ ruby-1.9.0-0 -e 'v = -39/40.0; p [v, v-0.5]'
[-0.975, -5.975]

Alexandre, thank you for your report and sorry for our late response. Could
you check whether the issue is still duplicated on trunk? If so, please
reopen this ticket (or register new ticket if you cannot reopen).
=end