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Profile Your Ruby Code in One Easy Step!

Everyone has written slow code so let me make an important distinction and say that code can be slow for two main reasons: 1. The operations being performed are, by nature, intensive in the

form of being either computationally-heavy or I/O-dependent.
  1. The code is poorly written or designed such that it is sufficiently sub-optimal that it’s inefficiency becomes noticeable.

Though code slow for the first reason is often code that cannot be improved much, code slow due the second reason can often be improved through various optimization techniques like algorithmic refinement, complete reimplementation or, less frequently, refactoring. Tracking down the slow parts and to determine the best way to proceed is not always easy in large or complicated programs. To assist in such performance analysis, there are numerous profilers available (but, as usual, Mac users should beware of foul play). For Ruby, there is the profiler module which enables automatic profile reports to be generated at the conclusion of a program’s run. When running quick analyses, you can enable profiling by telling the interpreter to require the profiler module at load-time with the -r command-line flag. If your program is contained in a file called program.rb, then you’d want to run ruby -r profiler program.rb while being conscious that the report is written to standard error. You can add a require 'profiler' to those files which you would like profiled all the time.

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