749495 - installation script process count

puppet/lib/puppet/parser/functions/katello_process_count.rb

@@ -0,0 +1,31 @@
+module Puppet::Parser::Functions
+  newfunction(:katello_process_count) do |args|
+    begin
+      cpu_count = scope.lookupvar('::processorcount')
+      consumes = 230_000_000 # for each thin process
+      reserve = 500_000_000 # for the OS
+      mem,unit = scope.lookupvar('::memorysize').split 
+
+      # convert total memory into bytes
+      total_mem = mem.to_f 
+      case unit 
+        when nil:  total_mem *= (1<<0) 
+        when 'kB': total_mem *= (1<<10) 
+        when 'MB': total_mem *= (1<<20) 
+        when 'GB': total_mem *= (1<<30) 
+        when 'TB': total_mem *= (1<<40) 
+      end
+
+      # calculate number of processes
+      no_processes = (((total_mem - reserve) / (cpu_count * consumes))).floor
+
+      # safeguard not to return bigger number then cpu count + 1
+      no_processes = cpu_count + 1 if no_processes > cpu_count * 2
+
+      no_processes
+    rescue Exception => e
+      # when anything goes wrong return a decent constant
+      2
+    end
+  end
+end

puppet/modules/katello/templates/etc/httpd/conf.d/katello.conf.erb

@@ -17,7 +17,7 @@ NameVirtualHost *:443
   ProxyTimeout 5400
 
   <Proxy balancer://thinservers>
-  <%- (processorcount.to_i + 1).times do |i| -%>
+  <%- katello_process_count().times do |i| -%>
     <%= "BalancerMember http://127.0.0.1:#{scope.lookupvar('katello::params::thin_start_port').to_i + i}/#{scope.lookupvar('katello::params::deployment')}" %>
   <%- end -%>
   </Proxy>

puppet/modules/katello/templates/etc/katello/thin.yml.erb

@@ -10,6 +10,6 @@ require: []
 
 environment: production
 max_persistent_conns: 512
-servers: <%= processorcount.to_i + 1 %>
+servers: <%= katello_process_count() %>
 daemonize: yes
 chdir: <%= scope.lookupvar("katello::params::katello_dir") %>