bench_rails_r.rb

require 'benchmark'
require 'net/http'
require 'uri'

def post_metrics_datadog(metrics, val)
  project = "hoge"
  api_key = ENV['DATADOG_API_KEY']
  current_time = Time.now.to_i
  uri = URI.parse("https://api.datadoghq.com/api/v1/series?api_key=#{api_key}")
  request = Net::HTTP::Post.new(uri)
  request.content_type = "application/json"
  request.body = "{ \"series\" :
                    [{\"metric\":\"#{metrics}\",
                     \"points\":[[#{current_time}, #{val}]],
                     \"type\":\"gauge\",
                     \"host\":\"#{project}\"}]
                  }"
  req_options = {
    use_ssl: uri.scheme == "https",
  }

  response = Net::HTTP.start(uri.hostname, uri.port, req_options) do |http|
    http.request(request)
  end
end

def profile_app_load_time
  Benchmark.measure do
    system("./bin/rails r '1;'") or raise "error"
  end
end

puts "=== Warming disk cache, ... ==="
puts profile_app_load_time

puts "=== Benchmark of 'rails r' 3 times ! ==="
3.times do
  result = profile_app_load_time
  # puts result
  puts result.real
  post_metrics_datadog('rails.runner.load_time', result.real)
end