ab_bisect.rb

# usage:
#   $ git bisect start HEAD [past good commit]
#   $ git bisect run ruby ab_bisect.rb

require 'systemu'

systemu 'bundle'
systemu 'bundle exec rails s -d'
sleep 5

# abコマンドでベンチマーク
status, stdout, stderr = systemu "ab -n 10 -c 10 'http://0.0.0.0:3000/'"
Process.kill 'KILL', `cat tmp/pids/server.pid`.to_i
sleep 3

# Requests per secondを抽出
stdout =~ /Requests per second:\s+([0-9\.]+)/
request_per_second = $1.to_f
puts "request_per_second: #{request_per_second}"

if request_per_second < 1.0
  puts 'bad'
  exit 1
end

puts 'good'
exit 0