gistfile2.txt

18:00:04 Temp$ allruby sc.rb
CYGWIN_NT-5.1 padrklemme1 1.7.5(0.225/5/3) 2010-04-12 19:07 i686 Cygwin
========================================
ruby 1.8.7 (2008-08-11 patchlevel 72) [i386-cygwin]
Rehearsal ----------------------------------------------
scan         2.766000   0.000000   2.766000 (  2.786000)
scan ++      4.656000   0.000000   4.656000 (  4.668000)
scan re      2.688000   0.000000   2.688000 (  2.696000)
scan re ++   4.531000   0.000000   4.531000 (  4.547000)
while        1.094000   0.000000   1.094000 (  1.135000)
------------------------------------ total: 15.735000sec

                 user     system      total        real
scan         2.875000   0.000000   2.875000 (  2.888000)
scan ++      4.640000   0.000000   4.640000 (  4.648000)
scan re      2.672000   0.000000   2.672000 (  2.698000)
scan re ++   4.578000   0.000000   4.578000 (  4.593000)
while        0.985000   0.000000   0.985000 (  1.029000)
========================================
ruby 1.9.1p378 (2010-01-10 revision 26273) [i386-cygwin]
Rehearsal ----------------------------------------------
scan         1.860000   0.000000   1.860000 (  1.867000)
scan ++      1.765000   0.000000   1.765000 (  1.767000)
scan re      1.719000   0.000000   1.719000 (  1.731000)
scan re ++   1.641000   0.000000   1.641000 (  1.643000)
while        0.578000   0.000000   0.578000 (  0.578000)
------------------------------------- total: 7.563000sec

                 user     system      total        real
scan         1.969000   0.000000   1.969000 (  2.010000)
scan ++      1.797000   0.000000   1.797000 (  1.835000)
scan re      1.718000   0.000000   1.718000 (  1.710000)
scan re ++   1.844000   0.000000   1.844000 (  1.863000)
while        0.813000   0.000000   0.813000 (  0.817000)
========================================
jruby 1.4.0 (ruby 1.8.7 patchlevel 174) (2009-11-02 69fbfa3) (Java HotSpot(TM) Client VM 1.6.0_20) [x86-java]
Rehearsal ----------------------------------------------
scan         0.750000   0.000000   0.750000 (  0.703000)
scan ++      0.906000   0.000000   0.906000 (  0.906000)
scan re      0.516000   0.000000   0.516000 (  0.516000)
scan re ++   0.797000   0.000000   0.797000 (  0.812000)
while        0.453000   0.000000   0.453000 (  0.453000)
------------------------------------- total: 3.422000sec

                 user     system      total        real
scan         0.563000   0.000000   0.563000 (  0.563000)
scan ++      0.859000   0.000000   0.859000 (  0.859000)
scan re      0.485000   0.000000   0.485000 (  0.485000)
scan re ++   0.797000   0.000000   0.797000 (  0.797000)
while        0.437000   0.000000   0.437000 (  0.437000)
18:01:21 Temp$ 

sc.rb

require 'benchmark'

TIMES = 100_000
s = "you like to play with your yo-yo"

Benchmark.bmbm do |x|
 x.report("scan") do
   TIMES.times do
       count = s.scan("yo").size
       raise count unless count == 4
   end
 end

 x.report("scan ++") do
   TIMES.times do
       count = 0
       s.scan("yo") { count += 1 }
       raise count unless count == 4
   end
 end

 x.report("scan re") do
   TIMES.times do
       count = s.scan(/yo/).size
       raise count unless count == 4
   end
 end

 x.report("scan re ++") do
   TIMES.times do
       count = 0
       s.scan(/yo/) { count += 1 }
       raise count unless count == 4
   end
 end

 x.report("while") do
   TIMES.times do
       len   = "yo".length
       index = -len
       count = 0
       while (index = s.index("yo", index + len))
               count += 1
       end
       count
       raise count unless count == 4
   end
 end
end