From: Robert Klemme <bob.news@...>
Date: 2004-12-01T17:47:45+09:00
Subject: Re: profile


"Brian Schr�der" <ruby@brian-schroeder.de> schrieb im Newsbeitrag
news:20041130230416.6299104d@black.wg...
> On Wed, 1 Dec 2004 06:52:47 +0900
> "Joe Van Dyk" <joe.vandyk@boeing.com> wrote:
>
> > Hi,
> >
> > Still pretty new to Ruby and profiling.  Are there any tools I can use
to
> > analyze my Ruby program to see where it's spending the bulk of the CPU
time?
> >
> > Thanks,
> > Joe
> >
> >
>
> ruby -rprofile -e'puts (1..200).inject(0) { | r, i | r + (-1)**i  *  1.0
/ i }'
> -0.690653430481824
>   %   cumulative   self              self     total
>  time   seconds   seconds    calls  ms/call  ms/call  name
>  44.44     0.04      0.04        1    40.00    80.00  Range#each
>  22.22     0.06      0.02      200     0.10     0.10  Fixnum#**
>  22.22     0.08      0.02      200     0.10     0.10  Float#/
>   0.00     0.08      0.00        1     0.00     0.00  Fixnum#+
>   0.00     0.08      0.00      200     0.00     0.00  Fixnum#*
>   0.00     0.08      0.00        1     0.00     0.00  Kernel.puts
>   0.00     0.08      0.00        2     0.00     0.00  IO#write
>   0.00     0.08      0.00      199     0.00     0.00  Float#+
>   0.00     0.08      0.00        1     0.00    80.00  Enumerable.inject
>   0.00     0.08      0.00        1     0.00    90.00  #toplevel
>   0.00     0.08      0.00        1     0.00     0.00
Profiler__.start_profile
>   0.00     0.08      0.00        1     0.00     0.00  Float#to_s
>

And an example for benchmark usage:

require 'benchmark'
include Benchmark

N = 10000
sample = ("foulx" * 100).freeze

bm(20) do |b|
  b.report("gsub!") do
    N.times do
      s = sample.dup
      s.gsub!(/x/, 'u')
    end
  end

  b.report("gsub") do
    N.times do
      s = sample.dup
      s = s.gsub(/x/, 'u')
    end
  end
end


09:41:57 [robert.klemme]: ruby /c/temp/ruby/stringperf.rb
                          user     system      total        real
gsub!                 3.203000   0.000000   3.203000 (  3.242000)
gsub                  3.203000   0.000000   3.203000 (  3.250000)

Regards

    robert