Added simple docs for optimizing RhodeCode performance

docs/usage/performance.rst

@@ -0,0 +1,38 b''
+.. _performance:
+
+================================
+Optimizing RhodeCode Performance
+================================
+
+
+Follow these few steps to improve performance of RhodeCode system.
+
+
+1. Increase cache::
+
+    in the .ini file    
+    beaker.cache.sql_cache_long.expire=3600 <-- set this to higher number
+
+    This option affects the cache expiration time for main page. Having
+    few hundreds of repositories on main page can sometimes make the system
+    to behave slow when cache expires for all of them. Increasing `expire`
+    option to day (86400) or a week (604800) will improve general response
+    times for the main page
+
+2. Switch from sqlite to postgres or mysql
+    
+    sqlite is a good option when having small load on the system. But due to
+    locking issues with sqlite, it's not recommended to use it for larger
+    setup. Switching to mysql or postgres will result in a immediate
+    performance increase.
+    
+3. Scale RhodeCode horizontally
+    
+
+    - running two or more instances on the same server can speed up things a lot
+    - load balance using round robin or ip hash
+    - you need to handle consistent user session storage by switching to 
+      db sessions, client side sessions or sharing session data folder across 
+      instances. See http://beaker.readthedocs.org/ docs for details.
+    - remember that each instance needs it's own .ini file and unique
+      `instance_id` set in them
  No newline at end of file

docs/index.rst

@@ -21,6 +21,7 b' Users Guide'
 
    usage/general
    usage/git_support
+   usage/performance
    usage/statistics
    usage/backup
    usage/debugging