hello Openproject-Team,
we finally managed to migrate from chiliproject to openproject release/3.0 .
We love this create peace of software. Thank you for that.
Now we have running Openproject in production, we mentioned slowing down our server rapidly from time to time.

In this case we get CPU-workload of 99% (from ruby process).
It seems the ruby freeze at some point.
The workarround for now is to kill such ruby-processes manualy.

Is there anything we made wrong by running openproject?
Please help us with this problem.

Here some detail information:

Installation: Installation-guide from wiki (Ubuntu 12.04)
System: linux64-bit, 2 GB Ram, VirtualHost
Branch: release/3.0
Mode: production
Server: Apache2 with passenger gem
Assets: precompiled
Memchached: activated
Bundler: 1.5.3
Ruby: 2.1.0p0

Production-Configuration (openproject/config/enviroments/production.rb)

  OpenProject::Application.configure do
    config.cache_classes = true
    config.consider_all_requests_local       = false
    config.action_controller.perform_caching = true

    # Disable Rails's static asset server (Apache or nginx will already do this)
    config.serve_static_assets = false

    # Compress JavaScripts and CSS
    config.assets.compress = true

    # Don't fallback to assets pipeline if a precompiled asset is missed
    config.assets.compile = false

    # Generate digests for assets URLs
    config.assets.digest = true

    config.assets.precompile += %w( default.css
                    rtl.css context_menu_rtl.css
                    accessibility.js accessibility.css
                    copy_issue_actions.js repository_naviengation.js select_list_move.js
                    jstoolbar/lang/*.js calendar/lang/*.js )


    # Enable locale fallbacks for I18n (makes lookups for any locale fall back to
    # the I18n.default_locale when a translation can not be found)
    config.i18n.fallbacks = true

    # Send deprecation notices to registered listeners
    config.active_support.deprecation = :notify
  end

Apache2-Passenger-Mod (apache2/mods-available/passenger.config

 <IfModule mod_passenger.c>
     PassengerRoot /home/openproject/.rvm/gems/ruby-2.1.0/gems/passenger-4.0.38
     PassengerDefaultRuby /home/openproject/.rvm/gems/ruby-2.1.0/wrappers/ruby
     PassengerPoolIdleTime 180
     PassengerMaxPoolSize 4
 </IfModule>

Apache2-Site-Configuration (apache2/site-available/openproject)

 <VirtualHost *:3000>
      ServerName our-site.lan
      DocumentRoot /home/openproject/openproject/public

      <Directory /home/openproject/openproject/public>
        AllowOverride all
        RailsEnv production
        RailsBaseURI /openproject
        Options -MultiViews +Includes +FollowSymlinks +Indexes
        PassengerResolveSymlinksInDocumentRoot on
        Order deny,allow
        Allow from all
      </Directory>
 </VirtualHost>