00-passenger.conf

LoadModule passenger_module <your-passenger-root-path>/ext/apache2/mod_passenger.so
PassengerRoot <your-passenger-root-path>

PassengerUseGlobalQueue on

PassengerMaxPoolSize 16

PassengerPoolIdleTime 0
PassengerMaxRequests 1000

PassengerRuby /usr/local/sbin/ree_wrapper

app.example.com.conf

<VirtualHost *:80>
  ServerName app.example.com
  ServerAlias app app.*
  UseCanonicalName On

  DocumentRoot /srv/appuser/app/current/public

  <Directory "/srv/appuser/app/current/public">
    Options FollowSymLinks
    AllowOverride None
    Order allow,deny
    Allow from all
  </Directory>

  # Deflate
  AddOutputFilterByType DEFLATE text/html text/plain text/xml application/xml application/xhtml+xml text/javascript text/css application/x-javascript application/json
  BrowserMatch ^Mozilla/4 gzip-only-text/html
  BrowserMatch ^Mozilla/4.0[678] no-gzip
  BrowserMatch bMSIE !no-gzip !gzip-only-text/html
</VirtualHost>

ree_wrapper.sh

#!/bin/sh

#
# Settings from Evan Weaver
# http://blog.evanweaver.com/articles/2009/04/09/ruby-gc-tuning/ 
#
RUBY_HEAP_MIN_SLOTS=500000 
RUBY_HEAP_SLOTS_INCREMENT=250000 
RUBY_HEAP_SLOTS_GROWTH_FACTOR=1 
RUBY_GC_MALLOC_LIMIT=50000000 
export RUBY_HEAP_MIN_SLOTS RUBY_HEAP_SLOTS_INCREMENT RUBY_HEAP_SLOTS_GROWTH_FACTOR RUBY_GC_MALLOC_LIMIT

exec "/opt/ree/bin/ruby" "$@"