zenprofiler helps answer WHAT is being called the most. spy_on helps answer WHERE those calls are being made. ZenProfiler provides a faster version of the standard library ruby profiler. It is otherwise pretty much the same as before. spy_on provides a clean way to redefine a bottleneck method so you can account for and aggregate all the calls to it.
% ruby -Ilib bin/zenprofile misc/factorial.rb 50000
Total time = 3.056884
Total time = 2.390000
total self self total
% time seconds seconds calls ms/call ms/call name
50.70 1.64 1.64 50000 0.03 0.05 Integer#downto
19.63 2.27 0.63 200000 0.00 0.00 Fixnum#*
14.19 2.73 0.46 50000 0.01 0.05 Factorial#factorial
9.93 3.05 0.32 1 320.36 3047.10 Range#each
5.54 3.23 0.18 2 89.40 178.79 ZenProfiler#start_hook
Once you know that Integer#downto takes 50% of the entire run, you can use spy_on to find it. (See misc/factorial.rb for the actual code):
% SPY=1 ruby -Ilib misc/factorial.rb 50000
Spying on Integer#downto
Integer.downto
50000: total
50000: ./misc/factorial.rb:6:in `factorial' via
./misc/factorial.rb:6:in `factorial'
4x faster than stdlib ruby profiler by using event_hook to bypass set_trace_func
1/14th the amount of code of ruby-prof. Much easier to play with.
% zenprofile [ruby-flags] misc/factorial.rb
then:
Array.spy_on :select, :each
run your code, then you’ll see where the calls to Array#select and each are coming from.
event_hook
RubyInline
sudo gem install zenprofile
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Copyright © 2009 Ryan Davis, seattle.rb
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