speed up bench add param for iterations

script/bench.rb

@@ -5,6 +5,7 @@
 
 @include_env = false
 @result_file = nil
+@iterations = 500
 opts = OptionParser.new do |o|
   o.banner = "Usage: ruby bench.rb [options]"
 
@@ -14,6 +15,9 @@
   o.on("-o", "--output [FILE]", "Output results to this file") do |f|
     @result_file = f
   end
+  o.on("-i", "--iterations [ITERATIONS]", "Number of iterations to run the bench for") do |i|
+    @iterations = i.to_i
+  end
 end
 opts.parse!
 
@@ -25,9 +29,7 @@ def run(command)
   require 'facter'
 rescue LoadError
   run "gem install facter"
-  puts "just installed the facter gem, rerunning script"
-  exec("ruby " + [ File.absolute_path(__FILE__), __FILE__ ], *ARGV)
-  exit
+  require 'facter'
 end
 
 @timings = {}
@@ -86,11 +88,10 @@ def prereqs
   ENV.delete "RUBY_FREE_MIN"
 else
   # clean env
-  puts "Running with default environment"
-  ENV.delete "RUBY_GC_MALLOC_LIMIT"
-  ENV.delete "RUBY_HEAP_SLOTS_GROWTH_FACTOR"
-  ENV.delete "RUBY_HEAP_MIN_SLOTS"
-  ENV.delete "RUBY_FREE_MIN"
+  puts "Running with the following custom environment"
+  %w{RUBY_GC_MALLOC_LIMIT RUBY_HEAP_MIN_SLOTS RUBY_FREE_MIN}.each do |w|
+    puts "#{w}: #{ENV[w]}"
+  end
 end
 
 def port_available? port
@@ -124,9 +125,9 @@ def port_available? port
 
 def bench(path)
   puts "Running apache bench warmup"
-  `ab -n 100 "http://127.0.0.1:#{@port}#{path}"`
+  `ab -n 10 "http://127.0.0.1:#{@port}#{path}"`
   puts "Benchmarking #{path}"
-  `ab -n 500 -e tmp/ab.csv "http://127.0.0.1:#{@port}#{path}"`
+  `ab -n #{@iterations} -e tmp/ab.csv "http://127.0.0.1:#{@port}#{path}"`
 
   percentiles = Hash[*[50, 75, 90, 99].zip([]).flatten]
   CSV.foreach("tmp/ab.csv") do |percent, time|