add benchmark script

test/benchmark.rb

@@ -0,0 +1,31 @@
+require 'rubygems'
+require File.dirname(__FILE__) + '/../lib/bdb/simple'
+require 'benchmark'
+
+N = 10_000
+A = [5, 6, "foo", :bar, "bar", {}, :foo, [1,2,4], true, [1,2,3], false, [1], [2], nil].collect {|i| Marshal.dump(i)}
+
+puts "compare_absolute (#{N} times)"
+t = Benchmark.measure do
+  N.times do
+    A.sort {|a,b| Bdb::Simple.compare_absolute(Marshal.load(a), Marshal.load(b)) }
+  end
+end
+puts t
+
+puts "compare_hash (#{N} times)"
+t = Benchmark.measure do
+  N.times do
+    A.sort {|a,b| Marshal.load(a).hash <=> Marshal.load(b).hash }
+  end
+end
+puts t
+
+puts "compare_raw (#{N} times)"
+t = Benchmark.measure do
+  N.times do
+    A.sort
+  end
+end
+puts t
+