Slow Actions in Rails Projects

March 13th, 2009 by

MySQL’s slow query log is a very handy tool to detect which SQL queries are running slowly in a production app.

So what about rails applications? Often, test data only contains a small amount of data. Over time more users use the site and generate more data. A page that usually renders in 100ms could be taking 3-5 seconds, or more!

I present, SlowActions. The goal was to analyze a standard log file to detect actions that render slowly. It had to be easy to use and also not require modification of rails’ logging mechanism. Observe:

  $> slow-actions --actions development.log
             Cost    Average Max
  - UsersController : game_history (22 entries, 0% Error)
    Total:   11275.447 3642.437 12728.0
    Render:  7.20300 2.32700 17.2450
    DB:      10.5020 3.39200 10.0000

  - QuestionsController : refresh_index_table (89 entries, 0% Error)
    Total:   908.494 202.348 307.000
    Render:  0.00000 0.00000 0.00000
    DB:      32.5880 7.25800 10.0000

More info after the break ….
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Posted in Benchmarking, Nick Gauthier, Programming, Ruby, Ruby on Rails | No Comments »

Benchmark Ruby Code with R, rsruby and better-benchmark

October 8th, 2008 by

I’ve found myself on a benchmarking kick these last couple of weeks. Sometime last week, I dug up the better-benchmark library written by Pistos. Pistos’ library is basically just a wrapper for the rsruby gem, which is more or less an interface to R (similar to what rmagick is to ImageMagick).

Combining these tools together, we can do some pretty nifty code performance analysis in very few lines of code, e.g.

require 'rubygems'
require 'better-benchmark'
 
result = Benchmark.compare_realtime(:iterations => 10) { |iteration|
  save_the_world()
}.with { |iteration|
  save_the_world_and_save_the_girl()
}
Benchmark.report_on result

I have forked better-benchmark and wrapped the library up into a RubyGem.

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Posted in Benchmarking, John Trupiano, Programming, Ruby, Testing | 4 Comments »

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