here is a link to how my APC is running : [removed]
As you can see, it fills up pretty quickly and my Cache Full Count goes over 1000 sometimes
My website uses W
The APC ttl should take care of fragment build up. I usually set it at 7200. I am running it on a small VPS with WordPress and my settings are:
apc.enabled=1
apc.shm_segments=3
apc.shm_size=32
apc.ttl=7200
apc.user_ttl=7200
apc.num_files_hint=2048
apc.mmap_file_mask=/tmp/apc.XXXXXX
apc.enable_cli=1
apc.max_file_size=10M
You will also get a lot more benefit from it by using WordPress's built in object cache and Mark Jaquith wrote a really good drop in plugin that should also help with some of your fragmentation issues when saving or editing a post.