Benchmarks for Sort algorithms

benchmarks/sorts.rb

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+$: << File.join(File.expand_path(File.dirname(__FILE__)), '../lib')
+require 'algorithms'
+include Algorithms
+
+require 'rubygems'
+require 'rbench'
+
+RBench.run(5) do
+
+  sorts = %w(ruby comb_sort heapsort insertion_sort shell_sort quicksort mergesort)
+  sorts.each { |sort| self.send(:column, sort.intern) }
+
+  n = 1000
+
+  proc = lambda { |scope, ary|
+    scope.ruby { ary.dup.sort }
+    scope.comb_sort { Sort.comb_sort(ary.dup) }
+    scope.heapsort { Sort.heapsort(ary.dup) }
+    scope.insertion_sort { Sort.insertion_sort(ary.dup) }
+    scope.shell_sort { Sort.shell_sort(ary.dup) }
+    scope.quicksort { Sort.quicksort(ary.dup) }
+    scope.mergesort { Sort.mergesort(ary.dup) }
+  }
+
+  report "Already sorted" do
+    sorted_array = Array.new(n) { rand(n) }.sort
+    proc.call(self, sorted_array)
+  end
+
+  report "Random" do
+    random_array = Array.new(n) { rand(n) }
+    proc.call(self, random_array)
+  end
+end