I'm curious how APC works with memory. On one host where object cache is used a lot the server can max out on 8GB memory. The hosting is seeing that object-cache.php is trying to allocate more then 512MB of memory. PHP memory_limit and apc.shm_size are both 512MB.
It seems that APC cache is always loaded to PHP and then set back. Is that correct? I'm trying to understand how to fix it.