Benchmark big reads

gistfile1.rb

# redmine.ruby-lang.org issue #2742
require 'benchmark'

begin
  require 'rbconfig'

  puts "(#{RbConfig::CONFIG['host_os']}) #{RUBY_VERSION}-p#{RUBY_PATCHLEVEL} \
#{RbConfig::CONFIG['CC']} #{RbConfig::CONFIG['optflags']} #{RbConfig::CONFIG['debugflags']}"
rescue LoadError
end

bm_engine = case RUBY_ENGINE
            when /ironruby|jruby/
              :bmbm
            else
              :bm
            end rescue :bm

Benchmark.send(bm_engine, 12) do |x|
  x.report("big_read[r]") { File.open("big_foo.txt", 'r') {|io| io.read } }
  x.report("big_read[rb]") { File.open("big_foo.txt", 'rb') {|io| io.read } }
  if RUBY_VERSION > '1.9'
    x.report("r:binary") { File.open("big_foo.txt", 'r:binary') {|io| io.read } }
  end

  x.report("readline[r]") do
    File.open("big_foo.txt", 'r') do |io|
      io.each_line {|l| l }
    end
  end
  x.report("readline[rb]") do
    File.open("big_foo.txt", 'rb') do |io|
      io.each_line {|l| l }
    end
  end
end