From: Robert Klemme <shortcutter@...>
Date: 2006-05-26T00:33:26+09:00
Subject: Re: How use Profiling, a Quick Guide.

2006/5/25, Pedro C�rte-Real <pedrocr@gmail.com>:
> On 5/24/06, Victor Shepelev <vshepelev@imho.com.ua> wrote:
> > Here can help my Module#add_tracer, described here
> > http://blade.nagaokaut.ac.jp/cgi-bin/scat.rb/ruby/ruby-talk/192291
>
> That's a nice idea. I made a small modification to count the totals of
> each of the calling methods instead of printing each time:
>
> $traces = Hash.new(0)
>
> class Module
>   def add_tracer(meth)
>     m_alias = case meth
>       when :[] : "old_idx"
>       when :+ : "old_plus"
>       when :- : "old_minus"
>       #and so on
>       else ; "old_#{meth}"
>     end
>     module_eval %Q{
>       alias :#{m_alias} :#{meth}
>       def #{meth}(*arg, &block)
>         str = caller[0]+"-"+self.class.name+"-##{meth}"
>         $traces[str] += 1
>         #{m_alias}(*arg, &block)
>       end
>     }
>   end
> end
>
> Array.add_tracer(:each)
>
> ....
> Your code here
> ....
>
> $traces.each {|name, value| puts "#{name} - #{value} calls"}
>
> You can also sort it by the value in the hash to get an ordered list.
> This will do for a hack but writing a tracing gem would be great.


Note that a similar thing can be achieved with set_trace_func

$ ruby -e 'set_trace_func lambda {|*a| p a}; "".length'
["line", "-e", 1, nil, #<Binding:0x100f6920>, false]
["c-call", "-e", 1, :length, #<Binding:0x100f67b8>, String]
["c-return", "-e", 1, :length, #<Binding:0x100f6770>, String]

You just need to evaluate parameters appropriately.  See also

http://ruby-doc.org/docs/ProgrammingRuby/html/ospace.html

Kind regards

robert


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