Question

我的Rails应用程序中有很多耙任务。下面是一个简单的示例。

desc "Simple rake task"
task :test_rake do |task|
    first_sql_query = FirstModel.find(10)
    SecondModel.create(:name => 'Test 101', :email => 'abc@def.co')
    final_query = SecondModel.find(900)
end

现在在上述rake任务中，我们正在进行三个数据库调用，每个数据库调用应该花费x，y，z秒。

有没有办法找出给定rake任务在数据库操作上花费的总时间（x+y+z秒）？？

Answer 1

使用benchmark

task :test_rake do |task|
    time = Benchmark.realtime {
        first_sql_query = FirstModel.find(10)
        SecondModel.create(:name => 'Test 101', :email => 'abc@def.co')
        final_query = SecondModel.find(900)
    }
    puts time
end

获得单独的基准测试

puts Benchmark.measure { FirstModel.find(10) }
puts Benchmark.measure { SecondModel.create(:name => 'Test 101', :email => 'abc@def.co') }
puts Benchmark.measure { final_query = SecondModel.find(900) }

Answer 2

@pattu Rails内部使用Benchmark进行执行时间检查say_with_time 您可以在模块中添加相同的功能，并将其包含在机架任务中以查找SQL查询的执行时间。

这两个功能是必需的：

def say(message, subitem = false)
  puts "#{subitem ? "   ->" : "--"} #{message}"
end

def say_with_time(message = "")
    say(message)
    result = nil
    time = Benchmark.measure { result = yield }
    say "%.4fs" % time.real, :subitem
    say("#{result} rows", :subitem) if result.is_a?(Integer)
    result
  end

在您的rake任务中将其用作

desc "Simple rake task"
task :test_rake do |task|
  say_with_time do 
    first_sql_query = FirstModel.find(10)
    SecondModel.create(:name => 'Test 101', :email => 'abc@def.co')
    final_query = SecondModel.find(900)
   end
end

Answer 3

查询时间包含在日志文件中

❯❯❯ rake db:migrate:status

database: ml_development

 Status   Migration ID    Migration Name
--------------------------------------------------
   up     20180612055823  ********** NO FILE **********

然后：

❯❯❯ cat log/development.log
[DEBUG]    (0.4ms)  SELECT "schema_migrations"."version" FROM "schema_migrations" ORDER BY "schema_migrations"."version" ASC

```

Rake任务中的SQL执行时间

3 个答案: