Board Optimization - Datastore cache to WinCache - boost your vBulletin

Also see: Wincache for vb 4.0.2

This allows you to use WinCache as a datastore cache in vBulletin. This also assumes that you have already installed Wincache version 1.1 or later. This is definitely your choice if you have already installed and enabled WinCache on your IIS server. Use at your own risk!

(See screenshot of stats below after 30mins up-time)

Prerequisites

• a working php installation
  
• a working vBulletin 3.8.x installation
  
• a working WinCache 1.1 or Better.

Install the modification

1. Add the following code to the end of class_datastore.php just above "?>"

// #############################################################################
// WINCACHE

/**
* Class for fetching and initializing the vBulletin datastore from WINCACHE
*/

class vB_Datastore_WINCACHE extends vB_Datastore
{
                /**
                * Indicates if the result of a call to the register function should store the value in memory
                *
                * @var  boolean
                */

                var $store_result = false;
 
                /**
                * Fetches the contents of the datastore from WINCACHE
                *
                * @param           array      Array of items to fetch from the datastore
                *
                * @return           void
                */
                function fetch($itemarray)
                {
                                if (!function_exists('wincache_ucache_get'))
                                {
                                                trigger_error('WINCACHE not installed', E_USER_ERROR);
                                }
 
                                $db =& $this->dbobject;
 
                                $itemlist = array();
 
                                foreach ($this->defaultitems AS $item)
                                {
                                                $this->do_fetch($item, $itemlist);
                                }
 
                                if (is_array($itemarray))
                                {
                                                foreach ($itemarray AS $item)
                                                {
                                                                $this->do_fetch($item, $itemlist);
                                                }
                                }
 
                                $this->store_result = true;
 
                                // some of the items we are looking for were not found, lets get them in one go
                                if (!empty($itemlist))
                                {
                                                $this->do_db_fetch(implode(',', $itemlist));
                                }
 
                                $this->check_options();
 
                                // set the version number variable
                                $this->registry->versionnumber =& $this->registry->options['templateversion'];
                }
 
                /**
                * Fetches the data from shared memory and detects errors
                *
                * @param           string     title of the datastore item
                * @param           array      A reference to an array of items that failed and need to fetched from the database
                *
                * @return           boolean
                */
                function do_fetch($title, &$itemlist)
                {
                                $ptitle = $this->prefix . $title;
 
                                if (($data = wincache_ucache_get($ptitle)) === false)
                                { // appears its not there, lets grab the data, lock the shared memory and put it in
                                                $itemlist[] = "'" . $this->dbobject->escape_string($title) . "'";
                                                return false;
                                }
                                $this->register($title, $data);
                                return true;
                }
 
                /**
                * Sorts the data returned from the cache and places it into appropriate places
                *
                * @param           string     The name of the data item to be processed
                * @param           mixed   The data associated with the title
                *
                * @return           void
                */
                function register($title, $data, $unserialize_detect = 2)
                {
                                if ($this->store_result === true)
                                {
                                                $this->build($title, $data);
                                }
                                parent::register($title, $data, $unserialize_detect);
                }
 
                /**
                * Updates the appropriate cache file
                *
                * @param           string     title of the datastore item
                * @param           mixed   The data associated with the title
                *
                * @return           void
                */
                function build($title, $data)
                {
                                $ptitle = $this->prefix . $title;
                                //The below line is not required as wincache_ucache_set will override the data if it is already present
                                //wincache_ucache_delete($ptitle);
                                wincache_ucache_set($ptitle, $data);
                }
}

2. Set your config.php to use wincache for datastore:

$config['Datastore']['class'] = 'vB_Datastore_WINCACHE';

Done!

Check the "User and Session Cache" section of your wincache.php (screenshot) in your browser to see stats!

Special thanks to the guys at Microsoft for their help! Official IIS support at http://forums.iis.net

Enjoy!

[Absolution]

Working on vbulletin 4.1.4 still.

Thanks for the mod, I never realized how good wincache is. I literally could handle over 2x as many users with it enabled.