bm.rb

require 'benchmark/ips'

Benchmark.ips do |x|
  # Configure the number of seconds used during
  # the warmup phase (default 2) and calculation phase (default 5)
  x.config(:time => 5, :warmup => 2)

  # Typical mode, runs the block as many times as it can
  x.report("No matches diff length") { "password123" == "321get" }
  x.report("No matches same length") { "password123" == "321kmnktget"}
  x.report("First matches")  { "password123" == "p533melw321" }
  x.report("First three matches")  { "password123" == "pas3melw361"  }
  x.report("First six matches")  { "password123" == "passwolw369"  }
  x.report("All matches")  { "password123" == "password123"   }



  # Compare the iterations per second of the various reports!
  x.compare!
end

output

Warming up --------------------------------------
No matches diff length
                       201.834k i/100ms
No matches same length
                       194.795k i/100ms
       First matches   189.996k i/100ms
 First three matches   218.544k i/100ms
   First six matches   221.095k i/100ms
         All matches   219.279k i/100ms
Calculating -------------------------------------
No matches diff length
                          6.272M (± 3.6%) i/s -     31.486M in   5.027266s
No matches same length
                          5.889M (± 3.5%) i/s -     29.414M in   5.001569s
       First matches      5.671M (± 7.5%) i/s -     28.309M in   5.027681s
 First three matches      5.865M (± 4.4%) i/s -     29.285M in   5.003480s
   First six matches      5.818M (± 3.9%) i/s -     29.185M in   5.024480s
         All matches      5.632M (± 7.1%) i/s -     28.068M in   5.012928s

Comparison:
No matches diff length:  6271696.3 i/s
No matches same length:  5888530.3 i/s - same-ish: difference falls within error
 First three matches:  5864885.5 i/s - same-ish: difference falls within error
   First six matches:  5817559.3 i/s - same-ish: difference falls within error
       First matches:  5671411.2 i/s - same-ish: difference falls within error
         All matches:  5632047.0 i/s - 1.11x  slower