On Wed, 23 Dec 2009 13:44:54 -0900 Chris Robertson <crobertson@xxxxxxx> wrote: > RW wrote: > > 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. > > > > > > From http://www.squid-cache.org/Doc/config/cache_swap_high/... > > > The low- and high-water marks for cache object replacement. > Replacement begins when the swap (disk) usage is above the > low-water mark and attempts to maintain utilization near the > low-water mark. As swap utilization gets close to high-water > mark object eviction becomes more aggressive. If utilization > is close to the low-water mark less replacement is done each time. But as I said cache_swap_high doesn't actually do anything in the 2.x code, and given that that description has been around a long time I doubt anything has changed in 3.x.
