Profiler__

Profile provides a way to Profile your Ruby application.

Profiling your program is a way of determining which methods are called and how long each method takes to complete. This way you can detect which methods are possible bottlenecks.

Profiling your program will slow down your execution time considerably, so activate it only when you need it. Don't confuse benchmarking with profiling.

There are two ways to activate Profiling:

Command line¶ ↑

Run your Ruby script with -rprofile:

ruby -rprofile example.rb

If you're profiling an executable in your $PATH you can use ruby -S:

ruby -rprofile -S some_executable

From code¶ ↑

Just require 'profile':

require 'profile'
def slow_method
 5000.times do
 9999999999999999*999999999
 end
end
def fast_method
 5000.times do
 9999999999999999+999999999
 end
end
slow_method
fast_method

The output in both cases is a report when the execution is over:

ruby -rprofile example.rb
 % cumulative self self total
 time seconds seconds calls ms/call ms/call name
 68.42 0.13 0.13 2 65.00 95.00 Integer#times
 15.79 0.16 0.03 5000 0.01 0.01 Fixnum#*
 15.79 0.19 0.03 5000 0.01 0.01 Fixnum#+
 0.00 0.19 0.00 2 0.00 0.00 IO#set_encoding
 0.00 0.19 0.00 1 0.00 100.00 Object#slow_method
 0.00 0.19 0.00 2 0.00 0.00 Module#method_added
 0.00 0.19 0.00 1 0.00 90.00 Object#fast_method
 0.00 0.19 0.00 1 0.00 190.00 #toplevel