对JRUBY Rails应用程序输出进行性能分析 <unknown> 元素

Question

Environment: Linux Mint 32 bit, JRuby-1.6.5 [ i386 ], Rails 3.1.3.

I am trying to profile my rails application deployed on JRuby 1.6.5 on WEBrick (in development mode).

My JRUBY_OPTS: "-Xlaunch.inproc=false --profile.flat"

In one of my models, I introduced an explicit sleep(5) and ensured that this method is called as part of before_save hook while saving the model. Pseudo code...

class Invoice < ActiveRecord::Base
 <some properties here...>

 before_save :delay

 private
 def delay
  sleep(5)
 end
end

The above code ensures that just before an instance of Invoice gets persisted, the method, delay is invoked automatically.

Now, when I profile the code that creates this model instance (through an rspec unit test), I get the following output:

6.31        0.00        6.31          14  RSpec::Core::ExampleGroup.run
6.30        0.00        6.30          14  RSpec::Core::ExampleGroup.run_examples
6.30        0.00        6.30           1  RSpec::Core::Example#run
6.30        0.00        6.30           1  RSpec::Core::Example#with_around_hooks
5.58        0.00        5.58           1  <unknown>
5.43        0.00        5.43           2  Rails::Application::RoutesReloader#reload!
5.00        0.00        5.00           1  <unknown>
5.00        5.00        0.00           1  Kernel#sleep
4.87        0.00        4.87          40  ActiveSupport.execute_hook
4.39        0.00        4.39           3  ActionDispatch::Routing::RouteSet#eval_block
4.38        0.00        4.38           2  Rails::Application::RoutesReloader#load_paths

In the above output, why do I see those two elements instead of Invoice.delay or something similar.

In fact, when I start my rails server (WEBrick) with the same JRUBY_OPTS (mentioned above), all my application code frames show up as unknown elements in the profiler output !

Am I doing anything wrong ?

Answer 1

Looks like you max of the profile methods limit Set -Xprofile.max.methods JRUBY_OPTS to a big number (default is 100000 and is never enough). Eg

export JRUBY_OPTS="--profile.flat -Xprofile.max.methods=10000000"