Sample benchmarks on Ruby

benchmarks.rb

require 'benchmark'

puts Benchmark.measure { "a"*1_000_000 }
0.060000   0.000000   0.060000 (  0.067556)
=> nil

n = 50000
Benchmark.bm do |x|
  x.report { for i in 1..n; a = "1"; end }
  x.report { n.times do   ; a = "1"; end }
  x.report { 1.upto(n) do ; a = "1"; end }
end
      user     system      total        real
  0.080000   0.010000   0.090000 (  0.099025)
  0.040000   0.000000   0.040000 (  0.038261)
  0.030000   0.010000   0.040000 (  0.036234)
=> true