Yuslow

Yuslow [waɪ ju sləʊ] is a lightweight profiler for Ruby designed to debug slow parts of your system.

Install

gem install yuslow

Usage

Require the gem in the file which you would like to investigate.

require 'yuslow'

then add

Yuslow.investigate do
  a_very_slow_method
end

or

investigation = Yuslow.investigation

investigation.start
a_very_slow_method
investigation.finish

to your code. Execute the code and you will see output in $stdout with the following tree structure. It will help you understand which branch and method of your code has poor performance.

Thread[1]:
  Object#very_slow elapsed 1000 ms
    Object#not_my_fault elapsed 1000 ms
      Object#not_me elapsed 0 ms
      Object#root_cause elapsed 1000 ms
        Kernel#sleep elapsed 1000 ms

Parameters

Parameter	Options	Default	Description
output	false :stdout	:stdout	Defines how the profiling results will be presented
max_level	number nil	nil	Specifies maximum profiling depth
debug	true false	false	Prints debug information while profiling