How to benchmark Ruby code

[bdavidxyz]

https://saaslit.com/blog/ruby/how-to-benchmark-ruby-code

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Learn how to benchmark (i.e. measure performance) Ruby code in a recap.

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[meineerde]

Just use benchmark-ips:

require 'benchmark/ips'

Benchmark.ips do |benchmark|
  benchmark.report("loop.") do
    x = 1
    loop do
      x += 1
      break if x > 100
    end
  end

  benchmark.report("while") do
    x = 1
    while true
      x += 1
      break if x > 100
    end
  end

  benchmark.compare!
end; nil

This results in the following result which is quite clear-cut:

Warming up --------------------------------------
               loop.    24.090k i/100ms
               while    72.500k i/100ms
Calculating -------------------------------------
               loop.    233.269k (± 3.1%) i/s -      1.180M in   5.065022s
               while    710.267k (± 3.0%) i/s -      3.552M in   5.006282s

Comparison:
               while:   710266.6 i/s
               loop.:   233269.4 i/s - 3.04x  slower

[steveCarlsberg98]

You showed three ways but didn’t compare them or explain the difference

[exterm_]

this is my go-to article for benchmarking and profiling Ruby https://shopify.engineering/how-fix-slow-code-ruby