benchmark_sort.rb

#!/user/bin/env ruby

require 'benchmark'

ary = []
10000.times {
  ary << rand(10000)
}

Benchmark.bm do |x|
  x.report("sort")               { ary.sort{ |a,b| b <=> a } }
  x.report("sort reverse")       { ary.sort.reverse }
end

# user          system     total      real
# sort          0.010000   0.000000   0.010000 (  0.012878)
# sort reverse  0.000000   0.000000   0.000000 (  0.001522)