Module: Benchmark::Compare

Included in:
Benchmark
Defined in:
lib/benchmark/compare.rb

Overview

Functionality of performaing comparison between reports.

Usage:

Add x.compare! to perform comparison between reports.

Example:

> Benchmark.ips do |x|
  x.report('Reduce using tag')     { [*1..10].reduce(:+) }
  x.report('Reduce using to_proc') { [*1..10].reduce(&:+) }
  x.compare!
end

Calculating -------------------------------------
    Reduce using tag     19216 i/100ms
Reduce using to_proc     17437 i/100ms
-------------------------------------------------
    Reduce using tag   278950.0 (±8.5%) i/s -    1402768 in   5.065112s
Reduce using to_proc   247295.4 (±8.0%) i/s -    1238027 in   5.037299s

Comparison:
    Reduce using tag:   278950.0 i/s
Reduce using to_proc:   247295.4 i/s - 1.13x slower

Besides regular Calculating report, this will also indicates which one is slower.

Instance Method Summary collapse

Instance Method Details

#compare(*reports) ⇒ Object

Compare between reports, prints out facts of each report: runtime, comparative speed difference.

Parameters:

  • reports (Array<Report>) —

    Reports to compare.



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# File 'lib/benchmark/compare.rb', line 32

def compare(*reports)
  return if reports.size < 2

  iter = false
  sorted = reports.sort do |a,b|
    if a.respond_to? :ips
      iter = true
      b.ips <=> a.ips
    else
      a.runtime <=> b.runtime
    end
  end

  best = sorted.shift

  $stdout.puts "\nComparison:"

  if iter
    $stdout.printf "%20s: %10.1f i/s\n", best.label, best.ips
  else
    $stdout.puts "#{best.rjust(20)}: #{best.runtime}s"
  end

  sorted.each do |report|
    name = report.label.to_s

    if iter
      x = (best.ips.to_f / report.ips.to_f)
      $stdout.printf "%20s: %10.1f i/s - %.2fx slower\n", name, report.ips, x
    else
      x = "%.2f" % (report.ips.to_f / best.ips.to_f)
      $stdout.puts "#{name.rjust(20)}: #{report.runtime}s - #{x}x slower"
    end
  end

  $stdout.puts
end