[squid-users] Re: How much disk space is reclaimed by the cache replacement algorithms?

On Wed, 23 Dec 2009 13:44:54 -0900
Chris Robertson <crobertson_at_gci.net> wrote:

> RW wrote:
> > On Wed, 23 Dec 2009 17:58:41 +0100
> > Matus UHLAR - fantomas <uhlar_at_fantomas.sk> 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.
Received on Thu Dec 24 2009 - 02:56:02 MST