benchmark to measure library loading time

bench_require.rb

###
### benchmark to measure library loading times.
###

require 'rubygems'
require 'benchmarker'

targets = %w[cgi cgi/session erb tempfile tmpdir openssl
             logger pathname pstore time date2 uri drb fileutils
             rss rexml/document yaml psych rubygems]

if RUBY_VERSION >= '1.9'
  targets.delete('date2')
elsif RUBY_VERSION < '1.9'
  targets.delete('psych')
end

nloop = 100
#Benchmarker.new(:cycle=>5, :extra=>1) do |bm|
Benchmarker.new() do |bm|

  bm.task "ruby" do
    nloop.times { system "ruby -e nil" }
  end

  targets.each do |lib|
    bm.task "ruby -r #{lib}" do
      nloop.times { system "ruby -r #{lib} -e nil" }
    end
  end

end

__END__

# benchmarker.rb:   release 0.0.0
# RUBY_VERSION:     1.8.7
# RUBY_PATCHLEVEL:  334
# RUBY_PLATFORM:    i686-darwin10.6.0
#
# ## Ranking                          real
# ruby                              0.6154 (100.0%) ********************
# ruby -r logger                    0.8813 ( 69.8%) **************
# ruby -r pathname                  0.9235 ( 66.6%) *************
# ruby -r erb                       0.9255 ( 66.5%) *************
# ruby -r rubygems                  1.4767 ( 41.7%) ********
# ruby -r drb                       1.5176 ( 40.6%) ********
# ruby -r time                      1.5904 ( 38.7%) ********
# ruby -r uri                       1.6151 ( 38.1%) ********
# ruby -r fileutils                 1.7256 ( 35.7%) *******
# ruby -r cgi                       1.7312 ( 35.5%) *******
# ruby -r tmpdir                    1.7836 ( 34.5%) *******
# ruby -r pstore                    1.9187 ( 32.1%) ******
# ruby -r date2                     1.9403 ( 31.7%) ******
# ruby -r openssl                   2.1919 ( 28.1%) ******
# ruby -r tempfile                  2.2530 ( 27.3%) *****
# ruby -r cgi/session               3.0182 ( 20.4%) ****
# ruby -r yaml                      3.2269 ( 19.1%) ****
# ruby -r rexml/document            4.0957 ( 15.0%) ***
# ruby -r rss                      32.9312 (  1.9%) 



# benchmarker.rb:   release 0.0.0
# RUBY_VERSION:     1.9.2
# RUBY_PATCHLEVEL:  180
# RUBY_PLATFORM:    x86_64-darwin10.6.0
#
# ## Ranking                          real
# ruby                              1.3350 (100.0%) ********************
# ruby -r erb                       2.1582 ( 61.9%) ************
# ruby -r pathname                  2.5100 ( 53.2%) ***********
# ruby -r cgi                       2.5815 ( 51.7%) **********
# ruby -r logger                    2.6093 ( 51.2%) **********
# ruby -r time                      3.0882 ( 43.2%) *********
# ruby -r openssl                   3.6157 ( 36.9%) *******
# ruby -r fileutils                 3.7521 ( 35.6%) *******
# ruby -r tmpdir                    3.9069 ( 34.2%) *******
# ruby -r uri                       4.3416 ( 30.7%) ******
# ruby -r drb                       4.7705 ( 28.0%) ******
# ruby -r pstore                    4.8795 ( 27.4%) *****
# ruby -r tempfile                  5.3818 ( 24.8%) *****
# ruby -r cgi/session               5.7381 ( 23.3%) *****
# ruby -r yaml                      8.1607 ( 16.4%) ***
# ruby -r psych                     8.4561 ( 15.8%) ***
# ruby -r rexml/document           10.9415 ( 12.2%) **
# ruby -r rubygems                 15.5546 (  8.6%) **
# ruby -r rss                      89.2050 (  1.5%)