measure Ruby performance

measure.rb

  def measure(no_gc = true, &block)
    if no_gc
      GC.disable
    else
      GC.start
    end
    memory_before = `ps -o rss= -p #{Process.pid}`.to_i/1024
    gc_stat_before = GC.stat
    time = Benchmark.realtime do
      yield
    end
    # puts ObjectSpace.count_objects
    unless no_gc
      GC.start(full_mark: true, immediate_sweep: true, immediate_mark: false)
    end
    # puts ObjectSpace.count_objects
    gc_stat_after = GC.stat
    memory_after = `ps -o rss= -p #{Process.pid}`.to_i/1024
    puts({ RUBY_VERSION => {
        gc: no_gc ? 'disabled' : 'enabled',
        time: time.round(2),
        gc_count: gc_stat_after[:count] - gc_stat_before[:count], memory: "%d MB" % (memory_after - memory_before)
      } }.to_json)
end