documenting the 'memcache_key_prefix' variable that can be set in  if more than one Drupal instance is to share memcache

create branch 'DRUPAL-5'.

Cherrypick from master 2007-05-22 08:28:56 UTC Robert Douglass <robertdouglass@5449.no-reply.drupal.org> 'simplifying stats output a bit':
    memcache.db.inc
    memcache_admin/memcache_admin.info
    memcache_admin/memcache_admin.module
    session-memcache.db.inc

The two-tiered variable system (which was designed to support a configuration GUI) is now gone. All memcache related configuration must be done in settings.php. The GUI will assist in generating pastable text which can be copied into settings.php. The bootstrap order problems that the two-tiered system created are nearly insurmountable and not worth the effort.

Adding DRUPAL-5-cache-serialze.patch which is a backport of the cache cleanup that has gone into Drupal 6. Updated memcache.inc with the same changes.

adding memcache.install. The install, uninstall and update hooks implemented add or remove the serialized column from any cache tables. See #137415. Postgres support only partially implemented.

Finally, a memcache.inc that actually sets and gets all the potential cache hits it is supposed to. This version is dependent on this patch: http://drupal.org/files/issues/cache_serialization_1.patch

Finally, a memcache.inc that actually sets and gets all the potential cache hits it is supposed to. This version is dependent on this patch: http://drupal.org/files/issues/cache_serialization_1.patch

"If you need to define global variables, their name should start with a single underscore followed by the module/theme name and another underscore"

Improving devel stats and handling the cache_set case where the expiration time is a timestamp in the future.

a Fedora Linux machine.

#134174 by lyricnz and robertDouglass: add get/set/hit statistics to the bottom of pages like devel module does with queries. Note that this marks the beginning of the rebuilding of memcache.module. All other functionality has been stripped for the time being.

Now with error supression on connecting so that your site can keep running if no memcache servers are available

With this version of memcache.inc, it is now possible to totally replace cache.inc. use  = array('cache_inc' => './includes/memcache.inc'); in settings.php, make sure that memcache.inc is in ./includes, and you can run a default memcache on localhost:11211 with no further configuration or patching.

Cache path lookups. This reduces the number of db queries by a huge number if you have pages with path aliases.

Adding node.patch. This caches built nodes for authenticated users who only have one role (authenticated user), aka your normal logged-in site user. Anonymously loaded nodes aren't cached because the page cache handles these, and nodes for users with more roles aren't cached because of the risk that they might render differently. In fact, there is some doubt that caching any built nodes is a viable solution. In any case, this reduces the queries to serve a Page to a logged in user from 24 to 19.