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Maintenant, vous regardez: Caching Is the Key to Drupal Performance

Caching Is the Key to Drupal Performance

The three secrets to optimal Drupal performance are cache, cache, and more cache. Every layer of the
Drupal server stack offers its own caching options, and you should familiarize yourself with how to take
advantage of all of them. Here’s a list of key areas to consider as you look for opportunities to improve
the performance of your site:

1. PHP opcode cache: Opcode caching is critical and its importance can be
understated. There is no good reason for not having an opcode cache other
than if you happen to prefer having high server loads and slow page load times.
For PHP opcode caches, your choices include APC, XCache, eAccelerator, etc.,
any of which can easily be installed into your PHP environment. The best
practice for opcode cache is APC (

Once your APC memory allocation has been set properly, there are many other configuration
settings that allow some fine-tuning of how APC runs. The full list of APC runtime settings is
available at A few of the most
commonly customized are:

This setting tells APC how many files you expect to be cached. It uses this information
when allocating cache storage space. The default is 1000, which is a pretty
good rough estimate for a single Drupal site. However, if you are running multiple
sites or a site with a lot of modules, increasing this could help reduce fragmentation.

This setting controls whether or not APC will “stat” (check) a file to be sure it hasn’t
been updated since the cache entry was created. The default is 1, meaning that APC
will perform this check. If set to 0, APC will not recheck files once they have been
pulled into the cache. This means that if you change a file, you need to reload Apache
in order for APC to read in that change. Obviously this is not ideal for development
environments, but it can lead to performance improvements in infrastructures with
high I/O latency. This setting needs to be approached carefully, as there are quite a
few other stats in the process of serving a request and they must all be disabled for
you to see much improvement.

2. Reverse proxy cache: A reverse proxy cache takes a tremendous amount of load
off your web servers. A proxy cache is a fast web server that sits in front of your
back-end web servers, caching any cacheable content passing through it (as a
write-through cache) so that subsequent web requests are served directly from
the proxy cache rather than from your back-end servers. varnish

3. Database caches: MySQL has its own built-in caches, particularly the query
cache (query_cache_size)
and file system I/O cache (innodb_buffer_pool_size),
which ought to be increased as high as your database server has the memory
available to do so.

4. Drupal caches: Drupal has its own caches for pages, blocks, and Views. Visit the
Drupal performance page in your Drupal admin interface, and turn them all on.
I’ll also talk about Press-flow, an optimized version of Drupal that improves on
Drupal’s own internal caching mechanisms.


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