Random Base-36 Benchmark

gistfile1.rb

require 'benchmark'

n = 1_000_000

(1..50).step(5) do |length|
  
  puts "Length: #{length}"

  Benchmark.bm do |x|
    x.report('array') { n.times { Array.new(length) { rand(36).to_s(36) }.join } }
    x.report('exponentiation') { n.times { rand(36**length).to_s(36).rjust(length, '0') } }
  end
end

# Length: 1
#       user     system      total        real
# array  1.190000   0.010000   1.200000 (  1.205521)
# exponentiation  0.410000   0.000000   0.410000 (  0.413634)
# Length: 6
#       user     system      total        real
# array  3.710000   0.010000   3.720000 (  3.719449)
# exponentiation  0.530000   0.000000   0.530000 (  0.533168)
# Length: 11
#       user     system      total        real
# array  5.920000   0.010000   5.930000 (  5.929622)
# exponentiation  0.600000   0.000000   0.600000 (  0.600140)
# Length: 16
#       user     system      total        real
# array  8.150000   0.010000   8.160000 (  8.159749)
# exponentiation  1.190000   0.000000   1.190000 (  1.196643)
# Length: 21
#       user     system      total        real
# array 10.490000   0.010000  10.500000 ( 10.508310)
# exponentiation  1.600000   0.000000   1.600000 (  1.599446)
# Length: 26
#       user     system      total        real
# array 12.700000   0.010000  12.710000 ( 12.713277)
# exponentiation  1.870000   0.010000   1.880000 (  1.875399)
# Length: 31
#       user     system      total        real
# array 14.960000   0.010000  14.970000 ( 14.973472)
# exponentiation  2.240000   0.000000   2.240000 (  2.241677)
# Length: 36
#       user     system      total        real
# array 17.390000   0.020000  17.410000 ( 17.416817)
# exponentiation  2.440000   0.000000   2.440000 (  2.447508)
# Length: 41
#       user     system      total        real
# array 19.540000   0.020000  19.560000 ( 19.562576)
# exponentiation  3.190000   0.000000   3.190000 (  3.193456)
# Length: 46
#       user     system      total        real
# array 21.690000   0.020000  21.710000 ( 21.712321)
# exponentiation  3.690000   0.010000   3.700000 (  3.702962)