On Wed, 23 Dec 2009 17:58:41 +0100 Matus UHLAR - fantomas <uhlar@xxxxxxxxxxx> wrote: > > 1. How often is the replacement done? > > when the percentage of configured cache_dir size crosses the > cache_swap_high value. I haven't looked at the code for a long-time and I only looked at 2.x, but cache_swap_high didn't seem to play any part that I could see. It's certainly not a simple high/low watermark algorithm. If you run a low-volume cache the percentage never budges from cache_swap_low (give or take a few objects), and if you shrink the cache size a little, it corrects within a couple of minutes, whether or not you hit the new cache_swap_high.
