Hello Folks, We're hosting an increasing number of Drupal (ick) sites on our servers, and while going over the diagnostic screen for APC, we noticed that identical files are being cached multiple times.
For example, "user.module" is cached 3 times for 3 sites. I've seen other people asking this question around forums and on SO, but no clear answer. According to the change-log, release 3.1.1 includes a "file_md5" option, which seems to be a dud - or maybe this was intended to be implemented at some point, but currently does nothing? The documentation isn't clear on what this option is for. It seems like it should not be too difficult to use an md5 (or other hash) of the file contents plus filename (sans path) and use that as the cache key? In shared hosting environments, this could reduce in-memory duplication quite a lot, or not? I think it's common to host multiple Drupal, Joomla or WordPress sites - all of which could share a common codebase, but personally I don't want them to, since this creates problems with deployment and maintenance/upgrades, and it seems like this would be a work-around more than a solution. Most sites use a framework these days, and most companies have one or two frameworks they prefer, so this feature would make a lot of sense. Is there some reason this is not as easy to implement as it might seem? (and just occurred to me, is this the correct list for this post? my apologies if it's not. looks like a lot of the contributors are on this list...)
