some memory stats and use jemalloc

this was recommended by Charlie Sommerville

Author: joshk

Gemfile

@@ -27,6 +27,8 @@ gem 'yajl-ruby',       '~> 1.4.0'
 # heroku
 gem 'unicorn',         '~> 4.6.2'
 
+gem 'jemalloc',        git: 'https://github.com/joshk/jemalloc-rb'
+
 group :development, :test do
   gem 'pry'
   gem 'rspec',         '~> 2.9'

Gemfile.lock

@@ -1,3 +1,9 @@
+GIT
+  remote: https://github.com/joshk/jemalloc-rb
+  revision: 8c9dbef98f6bd4f96b371ec336b7e0c4fdc02d49
+  specs:
+    jemalloc (1.4.5)
+
 GIT
   remote: https://github.com/travis-ci/travis-support
   revision: 113cff17fe383bb72fcfae3a97a8ce98c228342f
@@ -92,6 +98,7 @@ DEPENDENCIES
   activesupport (~> 4.1.11)
   backports (= 2.4.0)
   foreman (~> 0.41.0)
+  jemalloc!
   metriks
   metriks-librato_metrics
   pry

Procfile

@@ -1,2 +1,2 @@
-web: bundle exec unicorn -p $PORT -c ./config/unicorn.rb
+web: bundle exec je unicorn -p $PORT -c ./config/unicorn.rb
 console: bundle exec irb -I lib -r travis/listener

lib/travis/listener/app.rb

@@ -43,6 +43,7 @@ class App < Sinatra::Base
 
       # the main endpoint for scm services
       post '/' do
+        report_memory_usage
         report_ip_validity
         if !ip_validation? || valid_ip?
           if valid_request?
@@ -216,6 +217,10 @@ def request_body
           request.body.read.force_encoding("utf-8")
         end
       end
+
+      def report_memory_usage
+        Metriks.gauge("listener.gc.total_allocated_objects").set(GC.stat[:total_allocated_objects])
+      end
     end
   end
 end