Re: Q: TAG:reference_age

On Wed, 13 Jan 1999, Richard van Drimmelen wrote:

> Suppose that within one month my cache will grow bigger than the
> cache_dir size of 1500. That means no entries in the cache will have
> been removed because they have not been accessed for over one month.
> Will squid try to write to the cache (and create errors because the disk
> is full) or is a smarter algoritm involved ?

According to the source:

/*
 * storeExpiredReferenceAge
 *
 * The LRU age is scaled exponentially between 1 minute and
 * Config.referenceAge , when store_swap_low < store_swap_size <
 * store_swap_high. This keeps store_swap_size within the low and high
 * water marks. If the cache is very busy then store_swap_size stays
 * closer to the low water mark, if it is not busy, then it will stay
 * near the high water mark. The LRU age value can be examined on the
 * cachemgr 'info' page.
 */
time_t
storeExpiredReferenceAge(void)
...

Also, when storeExpiredReferenceAge() is less than 300 Squid stops
caching objects. See store_check_cachable_hist.no.lru_age_too_low.

Alex.
Received on Wed Jan 13 1999 - 10:31:34 MST