From 1bec6f4ca78384528d545f4a68d2732ae5e43922 Mon Sep 17 00:00:00 2001
From: Torsten Ruger <torsten@villataika.fi>
Date: Fri, 20 Nov 2015 19:13:21 +0200
Subject: [PATCH] simple bench runner to do multiple runs

---
 test/bench/runner.rb | 41 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 41 insertions(+)
 create mode 100644 test/bench/runner.rb

diff --git a/test/bench/runner.rb b/test/bench/runner.rb
new file mode 100644
index 00000000..6cdf7330
--- /dev/null
+++ b/test/bench/runner.rb
@@ -0,0 +1,41 @@
+require "benchmark"
+class Stats
+
+  def initialize
+    @n = 0
+    @mean = 0.0
+    @variance = 0.0
+  end
+  attr_reader :n , :mean ,  :variance
+
+  def add(x)
+    @n = @n + 1
+    delta = x - @mean
+    @mean = @mean + delta/@n
+    @variance = @variance + delta*(x - @mean)
+  end
+  def show
+    puts "no    per   var"
+    puts "#{@n}    #{@mean}   #{@variance}"
+  end
+end
+class Runner
+  def initialize num = 20
+    @stats = Stats.new
+    @cmd = ARGV[0]
+    @interations = num
+  end
+  def run
+    @interations.times { once }
+    @stats.show
+  end
+
+  def once
+    GC.disable
+    took = Benchmark.measure { %x("#{@cmd}")}.real
+    GC.enable
+    @stats.add took
+  end
+end
+
+Runner.new.run