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rspec - 是什么让 Rspec 占用 4gb 的内存来运行 500 个规范？

问题描述

当我在本地机器上运行这些规范时，我正在开发一个具有 500 多个规范的应用程序，它成功通过了。但是当这些规范在 CircleCI 上运行时，该进程被终止。我试图通过跟踪本地计算机上的内存来调查问题。当我看到 ruby​​ 进程占用 4gb 内存时，我感到很惊讶，这就是触发 CircleCI 杀死进程的原因。

我不确定我的规范占用所有这些内存的原因，我已经搜索了在每个规范之后清理内存但无济于事的配置。

这是我的rails_helper.rb

require "mongoid-rspec"

require "spec_helper"
ENV["RAILS_ENV"] ||= "test"
require File.expand_path("../../config/environment", __FILE__)
if Rails.env.production?
  abort("The Rails environment is running in production mode!")
end

require "database_cleaner"

require "rspec/rails"

#
Dir[Rails.root.join("spec/support/**/*.rb")].each { |f| require f }

RSpec.configure do |config|
  config.infer_spec_type_from_file_location!

  # FactoryGirl
  config.include FactoryGirl::Syntax::Methods

  # Render
  config.render_views

  # Filter lines from Rails gems in backtraces.
  config.filter_rails_from_backtrace!
  # arbitrary gems may also be filtered via:
  # config.filter_gems_from_backtrace("gem name")
  config.include Mongoid::Matchers, type: :model

  config.include Requests::JSONHelpers, type: :request
  config.include Requests::AuthHelpers, type: :request

  config.include Requests::JSONHelpers, type: :controller
  config.include Requests::AuthHelpers, type: :controller

  config.before(:suite) do
    DatabaseCleaner.orm = "mongoid"
    DatabaseCleaner.strategy = :truncation, { except: %w[roles] }
    DatabaseCleaner.clean_with(:truncation)
    Rails.application.load_seed # loading seeds
  end

  config.around(:each) do |example|
    DatabaseCleaner.cleaning do
      example.run
    end
  end

  config.after(:suite) do
    DatabaseCleaner.strategy = :truncation
    DatabaseCleaner.clean
  end
end

这是我的spec_helper.rb

require "mongoid-rspec"
require "webmock/rspec"
require "pundit/rspec"
require "excon"

WebMock.disable_net_connect!(allow_localhost: true)

RSpec::Matchers.define :match_response_schema do |schema|
  match do
    schema_directory = "#{Dir.pwd}/spec/schemas"
    schema_path = "#{schema_directory}/#{schema}.json"
    JSON::Validator.validate!(schema_path, parsed_json, strict: true)
  end
end
RSpec.configure do |config|
  config.expect_with :rspec do |expectations|
    expectations.include_chain_clauses_in_custom_matcher_descriptions = true
  end

  config.mock_with :rspec do |mocks|
    mocks.verify_partial_doubles = true
  end

  config.shared_context_metadata_behavior = :apply_to_host_groups

  config.include Mongoid::Matchers

  config.before(:all) do
    Excon.defaults[:mock] = true
    Excon.stub({}, body: "{}", status: 200)
  end
end

更新：我在每个示例之后启动垃圾收集器来修复它

在rails_helper.rb

config.after(:each) do |example|
    GC.start
end

但是，我希望找到比这更好的解决方案

标签： rspecrspec-railscircleciruby-on-rails-5.1rspec3

解决方案

有帮助的事实GC.start表明这不是内存泄漏。也许你有一些古怪的 GC 设置。如果是这样 - 尝试一些调整：https ://blog.evanweaver.com/2009/04/09/ruby-gc-tuning/

[在我意识到你的问题可能不是那个之前，我写了内存泄漏搜索部分，但我会留下它，因为它可能对某些人有用]

我要做的是运行分析ruby-prof，将其设置为收集 MEMORY 统计信息

这是和示例：

require 'ruby-prof'
RubyProf.measure_mode = RubyProf::ALLOCATIONS

result = RubyProf.profile(:track_allocations => true) do
   100.times { rand(1) ? "*" * rand(100) : 20* rand(100) }  
end  

printer = RubyProf::GraphHtmlPrinter.new(result)
printer.print(File.new("/tmp/report.html", "w+"))

报告看起来有点像这样 [![在此处输入图像描述][1]][1]

所以，你需要做的是这样的：

around(:suite) do |suite|
  require 'ruby-prof'
  RubyProf.measure_mode = RubyProf::ALLOCATIONS

  result = RubyProf.profile(:track_allocations => true) do
   suite.run 
  end

  printer = RubyProf::GraphHtmlPrinter.new(result)
  printer.print(File.new("/tmp/report.html", "w+"))
end

也许您将能够找到哪些对象被过度表示，并且从那里您可能会发现泄漏。尝试使用不同mearure_mode的 s 和打印机以获得更好的视角。[1]：https ://i.stack.imgur.com/2ZFcO.png

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