ruby/benchmark/gc/gcbench.rb

require 'benchmark'
require 'pp'

script = File.join(File.dirname(__FILE__), ARGV.shift)
script += '.rb' unless FileTest.exist?(script)
raise "#{script} not found" unless FileTest.exist?(script)

puts "Script: #{script}"

GC::Profiler.enable
tms = Benchmark.measure{|x|
  load script
}
gc_time = GC::Profiler.total_time
GC::Profiler.report if RUBY_VERSION >= '2.0.0' # before 1.9.3, report() may run infinite loop
GC::Profiler.disable
pp GC.stat

desc = "#{RUBY_VERSION}#{RUBY_PATCHLEVEL >= 0 ? "p#{RUBY_PATCHLEVEL}" : "dev"}"
name = File.basename(script, '.rb')

puts
puts script
puts Benchmark::CAPTION
puts tms
puts "GC total time (sec): #{gc_time}"

# show High-Water Mark on Linux
if File.exist?('/proc/self/status') && /VmHWM:\s*(\d+.+)/ =~ File.read('/proc/self/status')
  puts
  puts "VmHWM: #{$1.chomp}"
end

puts
puts "Summary of #{name} on #{desc}\t#{tms.real}\t#{gc_time}\t#{GC.count}"
puts "         (real time in sec, GC time in sec, GC count)"