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Content Tagged with mint + Rails

The Rails Analyzer Tools are a very useful way to keep tabs on the performance of your site. They were written by Eric Hodel and have been open-sourced to the community by the Robot Co-Op.

The problem is that you need to install and run SysLogLogger to make it work. If you have more than one Rails app on a box, or if you don’t have root access to the box, or if you are on a shared host, you are out of luck.

No longer!

Install the Gems on Your Server

gem install production_log_analyzer
gem install rails_analyzer_tools

Install the Hodel3000CompliantLogger in your Rails app

Download the logger replacement and put it in your lib directory. (I’ll make this into a proper plugin soon.)

In the Initializer section of environment.rb, add

require 'hodel_3000_compliant_logger'
config.logger = Hodel3000CompliantLogger.new(config.log_path)

Run your app

For some reason, the standard script/server forces logging to work the old way. If I run mongrel_rails start, it works fine. I’m also running a production app with mongrel and it works as expected.

If you tail -f log/development.log you should see something like this:

Jan 03 10:08:09 topfunky rails[4535]: Rendered shared/_menu (0.14430)
Jan 03 10:08:09 topfunky rails[4535]: Rendered shared/_flashes (0.00882)
Jan 03 10:08:09 topfunky rails[4535]: Completed in 1.70117 (0 reqs/sec) | Rendering: 1.61409 (94%) | DB: 0.02340 (1%) | 200 OK [http://localhost/products/capistrano-concepts]

Analyze

Deploy your app, or just try this out locally from the command-line.

$ pl_analyze log/development.log

Request Times Summary:          Count   Avg     Std Dev Min     Max
ALL REQUESTS:                   33      0.226   0.304   0.005   1.695

OrdersController#show:          6       0.071   0.112   0.005   0.316
ProductsController#show:        3       0.306   0.061   0.231   0.381
ProductsController#home:        2       0.318   0.068   0.249   0.386
OrdersController#index:         2       0.328   0.206   0.123   0.534
PagesController#show:           2       0.432   0.047   0.385   0.479
ProductsController#index:       1       0.279   0.000   0.279   0.279

Slowest Request Times:
        OrdersController#index took 0.534s
        PagesController#show took 0.479s
        ProductsController#home took 0.386s
        PagesController#show took 0.385s
        ProductsController#show took 0.381s

# DB times and Render times follow

rails_stat is also nice for seeing a live report of the performance of your app.

$ rails_stat log/development.log

~ 0.9 req/sec, 14.2 queries/sec, 19.9 lines/sec
~ 0.3 req/sec, 14.1 queries/sec, 17.0 lines/sec

Once more, with feeling!

Run the report in a cron task and send the results to yourself via email (see the -e flag to pl_analyze), or automate the reporting with Capistrano.

desc "Analyze Rails Log instantaneously" 
task :pl_analyze, :roles => :app do
  run "pl_analyze #{shared_path}/log/#{rails_env}.log" do |ch, st, data|
    print data
  end
end

desc "Run rails_stat" 
task :rails_stat, :roles => :app do
  stream "rails_stat #{shared_path}/log/#{rails_env}.log" 
end

For more details on Capistrano, buy the new PeepCode Capistrano Concepts screencast.

And again, from the top

For extra credit, use my Mint Pepper plugin (download) and my Mint Rails Plugin to put nightly data into the database (also requires the setup of logrotate, to be discussed later).

Note

Remember, this is not about maximum performance. These reports show you the actual performance of your app as it is being browsed, not the theoretical maximum performance.

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