I have varnish, memcache, APCu & OPCache installed.
Using the varnish module & memcache module.
Want to use this apc module.

Question is...
What would be the best configuration in the settings.php file be for using this combination of varnish, memcache & apcu?

Does this module even support APCu? or only APC?

Thank you in advance.

Comments

jsidigital created an issue. See original summary.

jsidigital’s picture

jsidigital commented

I found the following two posts:
https://www.drupal.org/node/1477590
https://www.drupal.org/node/1802266

Also these:
https://www.rklawson.com/blog/2012/04/14/caching-drupal-7-varnish-apc-an...
https://drupal.stackexchange.com/questions/25219/using-drupal-7-with-apc...
https://2bits.com/articles/benchmarking-apc-vs-eaccelerator-using-drupal...

Works great on one site.

However, then using multiple drupal sites, APC starts giving me white pages of death on sites. If i remove APC code from settings.php it works again. So definitely caches are being shared within the sites. So, question is... Is there a way to add a prefix to APC to avoid different websites on the same server from clashing with each other?

davidsickmiller’s picture

davidsickmiller commented

The apc module tries to use $conf['cache_prefix'] as the cache prefix. If that's not available, it uses HTTP_HOST.

I'm not really in a position to comment on the use of memcache and apc together.

fgm’s picture

fgm
Primary language French
Location Paris, France
commented

APCu support is available in https://www.drupal.org/project/apc/issues/2846622

fgm’s picture

fgm
Primary language French
Location Paris, France
commented
Related issues: +#2846622: Change the module to require only the APCu extension
avpaderno’s picture

avpaderno
he/him
Primary language Italian
Location Brescia, 🇮🇹 🇪🇺
commented
Priority: Major » Normal
Issue tags: -apcu, -opcache, -Varnish 3, -memcache
avpaderno’s picture

avpaderno
he/him
Primary language Italian
Location Brescia, 🇮🇹 🇪🇺
commented

What reported in the project page is always valid.

Use the cache implemented by this module for caches that do not change often and will not grow too big to avoid fragmentation. The default setting of APCu will allow you to store 32 MiB. Make sure you tweak this according to your website's needs. An example configuration could be to cache cache and cache_bootstrap in APCu, cache_field and cache_menu in Memcached, and store cache_filter in the database.

It cannot be more specific, as giving suggestions that are valid for all sites is quite hard.

OPcache is an opcode cache. It makes the code run faster because it caches the opcode the PHP interpreter generates from the PHP code. It does not conflict with APCu, which only caches data.

Varnish is a s a reverse caching proxy. It caches the pages produced by a HTTP server. It does not conflict with APCu. It eventually avoids a page is generated by the server and it lifts off some work from the HTTP server.

avpaderno’s picture

avpaderno
he/him
Primary language Italian
Location Brescia, 🇮🇹 🇪🇺
commented
Status: Active » Fixed

Status: Fixed » Closed (fixed)

Automatically closed - issue fixed for 2 weeks with no activity.