Ruby

# 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 application will slown 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.

#

# 1. Command line

#

# Run your Ruby script with <tt>-rprofile</tt>, like this:

#

# ruby -rprofile example.rb

#

# 2. 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

#