… heavily caching using apc (~200k items, 300MB size, up to 250 page-req/sec, several apc-gets per page), and after restarting the….” thats why i tried memcached… the production server does ~25k memcache-gets(unix-socket)/sec, compared to ~100k apc-gets/sec. after a… didn’t work well)… but i’m confident that memcache _can_ handle all the caching i throw at it (better than apc).

Yes…. use a hierarchy of caches. local (APC in this case ) -> memcached -> disk If you’re using something like MogileFS of tagulacache… APC cache and run out of memory. In Tailrank we only really have a few objects in memcached so we just use that and skip APC…

… for APC to each webserver, then assign 1 GB of RAM for memcached on each server. It is not either/or situation. APC caches PHP opcode, whereas memcached caches results from… database. Use both, use it with nginx instead of Apache, and be prepared to be blown off your feet with the…

… make sense adding the client to use APC as remote cache. MemcacheD is implemented pretty well and has decent client API (It is extension in PHP so it is faster than you would write in PHP itself) – APC is faster because it is local not because memcached is slow – I think it gets…

A very important consideration people forget: APC is hooked to your webserver, so if you restart your … (I do), your entire APC cache gets deleted. memcached runs as a separate daemon and whatever I store in memcache stays intact. I store data for long periods of time that gets accessed again and again…

…APC is faster as a straight PHP call on the memory …, which with memcached is possible but not with APC as it is PHP specific.  For more information on performance and advice on…

…’s not so hard to make APC distributed as well. The distribution of cache entries in Memcached is managed by the client… could write a PHP class that takes care of this, and inserts/requests cache entries from/into the different nodes in…, between the webservers. It allows you to use APC both for local caching, and distributed caching. The same method applies to file…

I was considering memcache and APC/EA/XCache for a single server and believe that network cache should be slower, but how much. I’m glad to found this benchmark.