Distributed Memory Cache
A multiple-host installation in which each Content Engine instance
maintains its own cache is not particularly efficient: it is better to
pool the memory in a single, common cache. The most commonly-used means
of doing this is to use the open source distributed cache manager
memcached.
The instructions below tell you how to install
memcached, configure it and then reconfigure your
publications' PresentationArticleCache caches to use
it. These caches will then share a single memory pool managed by
memcached.
These instruction are based on the assumption that you want to
install memcached on all your
engine-hosts: memcached will
then use some memory from each host. It might be the case, however,
that you would prefer to concentrate the cache on a smaller number of
hosts, or on one specific host. You may even wish to locate the cache
on a completely different host, one that is not running the
Content Engine. memcached is a completely
free-standing application, and you can install it on any host or group
of hosts in your network. The configuration described below is only
one of many possible set-ups.
Note that if you are using memcached, the decorator must be serializable.