Compare Array#dup on 1D array, versus Marshal.load(Marshal.dump(...)) on 2D array

benchmark-dup.rb

require 'benchmark'

N = 100_000
SIZE = 10

array_1d = Array.new(SIZE * SIZE, 0)
array_2d = Array.new(SIZE) { Array.new(SIZE, 0) }

Benchmark.bm do |bm|
  bm.report("1d.dup") { N.times { array_1d.dup } }
  bm.report("2d.dup") { N.times { Marshal.load(Marshal.dump(array_2d)) } }
end

results.txt

       user     system      total        real
1d.dup  0.030000   0.000000   0.030000 (  0.029078)
2d.dup  2.540000   0.010000   2.550000 (  2.554168)