Created attachment 865679 [details]
broker.log

Description of problem:
  If a user tries to create multiple apps in parallel, the Passenger count seems to stuck at the what /var/www/openshift/broker/httpd/broker.conf's PassengerMinInstances (default to 2).  As a result of this, the POST requests are queued up in a set of 2's until the previous queued-up requests have finished executing.

Version-Release number of selected component (if applicable):
devenv/origin/ose

How reproducible:
always.

Steps to Reproduce:
run the following ruby script...changing the parameter as necessary to fit your setup.

#!/usr/bin/env ruby
thread_list = []
(1..30).each  { |n|
  thread_list << Thread.new {
    if (n % 2) == 0
      cmd = "curl -k -H 'Accept: application/xml' --user demo:changeme  https://10.14.16.227/broker/rest/domain/origin/applications   -d name=app#{n} -d cartridges[]=php-5.3 -X POST"
    else
      cmd = "curl -k -H 'Accept: application/xml' --user demo:changeme  https://10.14.16.227/broker/rest/domain/origin/applications -X GET"
    end
    system(cmd)
  }
}
thread_list.each {|x| x.join}



Actual results:
the HTTP requests are not executed in parallel because the Passenger instances are not scaling up to meet the demands.

Expected results:
HTTP requests are executed in parallel

Additional info: