[Rails] Benchmark to test ruby code performance

def create_object(n)
  n.times do
    Object.new
  end
end

require 'benchmark'

puts Benchmark.measure { create_object(10_000_000) }

    user     system      total        real
1.270000   0.010000   1.280000 (  1.272028)

require 'benchmark'

result = Benchmark.realtime { create_object(10_000_000) }
puts "Creating ten million objects: #{result.round(2)}s"

Creating ten million objects: 1.27s

def sort_array
  (1..1000000).map { rand }
end

require 'benchmark'

Benchmark.bm(5) do |x|
  x.report("sort!") { sort_array.dup.sort! }
  x.report("sort")  { sort_array.dup.sort  }
end

            user     system      total        real
sort!   0.860000   0.010000   0.870000 (  0.874565)
sort    0.870000   0.010000   0.880000 (  0.879724)

require 'benchmark'

Benchmark.bmbm do |x|
  x.report("sort!") { sort_array.dup.sort! }
  x.report("sort")  { sort_array.dup.sort  }
end

Rehearsal -----------------------------------------
sort!   0.870000   0.010000   0.880000 (  0.877750)
sort    0.870000   0.010000   0.880000 (  0.884924)
-------------------------------- total: 1.760000sec

            user     system      total        real
sort!   0.880000   0.010000   0.890000 (  0.894623)
sort    0.890000   0.010000   0.900000 (  0.898280)

require 'benchmark'
include Benchmark # we need the CAPTION and FORMAT constants

num = 5000000
Benchmark.benchmark(CAPTION, 7, "111%r", ">total:", ">avg:") do |x|
  tf = x.report("for:")   { for i in 1..num; a = "1"; end }
  tt = x.report("times:") { num.times do   ; a = "1"; end }
  tu = x.report("upto:")  { 1.upto(num) do ; a = "1"; end }
  [tf+tt+tu, (tf+tt+tu)/3]
end

              user     system      total        real
for:      0.350000   0.000000   0.350000 (  0.349957)
times:    0.340000   0.000000   0.340000 (  0.341593)
upto:     0.340000   0.010000   0.350000 (  0.348147)
>total:   1.030000   0.010000   1.040000 (  1.039697)
>avg:     0.343333   0.003333   0.346667 (  0.346566)