Re: Rails (rails 3 and ruby 1.9.3) and ruby-prof

[rogerdpack]

I think you're seeing the same thing as this other fella did:
https://groups.google.com/forum/?hl=en_US&fromgroups#!topic/ruby-optimization/TyeOmxSei4o

Do you have a way to send it to us to reproduce it?
-r


On Tuesday, July 10, 2012 9:30:54 AM UTC-6, lifey wrote:

Hi,

I am trying to use ruby-prof in a little bit different way than I c in the documentation and I fail. 

So I added the following lines into the routes.rb file (two actions which will stop and start the profiler ):

 match 'rubyprof/start' => 'rubyprof#start'

 match 'rubyprof/stop' => 'rubyprof#stop'

And I added the new controller:

require 'ruby-prof'

class RubyprofController < ApplicationController

  def start

    RubyProf.start

    is = StringIO.new

    is << 'Profiler started'

    render :inline => is.string

  end

  def stop

    result = RubyProf.stop

    is = StringIO.new

    if (params.has_key?(:callstack))

      printer = RubyProf::CallStackPrinter.new(result)

      printer.print(is, :min_percent=>0)

    end

    if (params.has_key?(:graphhtml))

      printer = RubyProf::GraphHtmlPrinter.new(result)

      printer.print(is, :min_percent=>0)

    end

    if (params.has_key?(:flat))

      printer = RubyProf::FlatPrinter.new(result)

      printer.print(is, :min_percent=>0)

    end

    if (params.has_key?(:file))

      printer = RubyProf::FlatPrinter.new(result)

      fs = File.open(params[:file], 'w')

      fs.puts is.string

    end

    render :inline => is.string

  end

end

It works fine when I do nothing between the start and the stop 

If actual work is done (accessing the application from the web ) I get :

NoMethodError in RubyprofController#stop

You have a nil object when you didn't expect it!
You might have expected an instance of Array.
The error occurred while evaluating nil.collect

Rails.root: /var/www/projects/XXXXXXXX/current

Application Trace | Framework Trace | Full Trace

app/models/tableless.rb:27:in `inspect'
ruby-prof (0.11.2) lib/ruby-prof/printers/graph_html_printer.rb:64:in `full_name'
ruby-prof (0.11.2) lib/ruby-prof/printers/graph_html_printer.rb:64:in `method_href'
ruby-prof (0.11.2) lib/ruby-prof/printers/graph_html_printer.rb:58:in `create_link'
(erb):148:in `block (3 levels) in print'
(erb):137:in `each'
(erb):137:in `block (2 levels) in print'
(erb):96:in `reverse_each'
(erb):96:in `block in print'
(erb):74:in `each'
(erb):74:in `print'
/usr/lib/ruby/1.9.1/erb.rb:838:in `eval'
/usr/lib/ruby/1.9.1/erb.rb:838:in `result'
ruby-prof (0.11.2) lib/ruby-prof/printers/graph_html_printer.rb:44:in `print'
app/controllers/rubyprof_controller.rb:21:in `stop'

What am I doing wrong ? 

Should ruby prof be started end stopped from the same flow ?

Can this be a result of other threads interaction ?

Thanks in advance for any help .