rails - 为rails消耗的内存做检测 memory leak 检测工具 derailed_benchmarks

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参考：https://github.com/schneems/derailed_benchmarks

和 另外一种更牛的方式：https://collectiveidea.com/blog/archives/2015/02/19/optimizing-rails-for-memory-usage-part-1-before-you-optimize

安装：

# 检测内存泄漏
gem 'derailed_benchmarks', group: :development
gem 'stackprof', group: :development

然后 $ bundle 就可以

运行： 

注意： 默认都是 :default  和  production group下的Gem的情况。

1. 查看各种Gem占用的内存   $ CUT OFF=0 bundle exec derailed bundle:mem  ( CUT OFF=0可以只在精确查看的时候使用）

# bundle exec derailed bundle:mem  

TOP: 117.3281 MiB
  rails/all: 21.5273 MiB
    rails: 9.9023 MiB (Also required by: active_record/railtie, active_model/railtie, and 12 others)
      active_support/railtie: 4.5859 MiB
        active_support/i18n_railtie: 4.5859 MiB
          active_support/file_update_checker: 2.6797 MiB (Also required by: rails/application/configuration)
            active_support/core_ext/time/calculations: 2.6797 MiB (Also required by: active_support/core_ext/time, active_support/core_ext/numeric/time)
              active_support/core_ext/time/conversions: 2.0195 MiB (Also required by: active_support/core_ext/time, active_support/core_ext/date_time/conversions)
                active_support/values/time_zone: 1.7695 MiB (Also required by: active_support/time_with_zone, active_support/core_ext/date_time/conversions)
                  tzinfo: 1.7695 MiB
                    tzinfo/timezone: 0.5156 MiB
  awesome_rails_console: 6.5273 MiB
    awesome_rails_console/railtie: 6.5078 MiB
      pry-rails: 6.0273 MiB
        pry: 6.0273 MiB
          pry/cli: 2.8281 MiB
            /root/.rbenv/versions/2.3.8/lib/ruby/gems/2.3.0/gems/pry-byebug-3.6.0/lib/pry-byebug/cli.rb: 2.8281 MiB
              pry-byebug/pry_ext: 2.4492 MiB
                byebug/processors/pry_processor: 2.4492 MiB
                  byebug/core: 2.4492 MiB
                    byebug/commands: 1.8711 MiB
                      byebug/commands/irb: 0.7461 MiB (Also required by: /root/.rbenv/versions/2.3.8/lib/ruby/gems/2.3.0/gems/byebug-10.0.2/lib/byebug/settings/autoirb.rb)
                        irb: 0.7461 MiB
                          irb/ruby-lex: 0.4922 MiB
          pry/commands: 1.6602 MiB
      awesome_print: 0.4805 MiB
  uglifier: 5.7539 MiB
    execjs: 4.543 MiB (Also required by: coffee_script)
      execjs/runtimes: 0.6445 MiB
    uglifier/version: 0.9922 MiB
  amoeba: 4.4961 MiB
    active_record/base: 3.9805 MiB
      active_record/validations: 0.7734 MiB
        active_model/validations: 0.5156 MiB
      active_record/querying: 0.3711 MiB
  pg: 3.9648 MiB
    pg_ext: 3.707 MiB

2. 查看生成的对象:  $ bundle exec derailed bundle:objects > ~/bundle_objects

Measuring objects created by gems in groups [:default, "production"]
Total allocated: 115071535 bytes (947207 objects)
Total retained:  17119271 bytes (153423 objects)

allocated memory by gem
-----------------------------------
  66666792  activesupport-5.0.7
   7092878  mime-types-3.1
   6425203  sass-3.5.6
   5460937  aws-sdk-core-3.48.6
   4589682  aws-sdk-s3-1.30.1
   2124724  bundler-2.0.1
   1940568  set
   1669384  pry-0.11.3
   1666237  addressable-2.5.2
   1281093  aws-sdk-kms-1.17.0

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