On 21/08/2015 8:36 p.m., Stakres wrote: > Hi Amos, > Is that possible to have a dedicated option with the Squid to keep objects > in the cache if they're regulary used even if the time is expired ? > Cleaning small expired files (<16kb) is not a problem but we must keep big > files into the cache if often used. > There are many "small" ISPs with 2, 4 or 8Mbps bandwidth and big files are a > problem if they've to download a fresh copy every month (if max-day 1 > month). > Doing a local copy is not a right way here because too many possible big > objects and issues to manage them, we should have Squid able to do that. > > I'm thinking something like that: > save_big_file on/off > save_big_file_min_size 128 MB > save_big_file_max_time 1 years > > Would it be something you could implement with Squid ? > I'm sure it would work so fine Stale objects *do* stay in cache. I think that behaviour is pretty much what happens with LRU in practice. To be removed it has to be *the* least recently used object in cache when that watermark algorithm we are fixing in the other thread runs. Its just that if you are talking an object used literally once a month and the smaller objects have a high churn rate resulting in a 1-week LRU age. Then it would be stored for only that week before it met the criteria for removal. If its touched at any time in that week its LRU-age becomes 0 again and starts re-counting back towards a week while the churn goes on with other objects. The current policy/algorithm options are here: <http://www.squid-cache.org/Doc/config/cache_replacement_policy/> new ones are possible of course with the usual wait/sponsor/DIY options and disclaimers about feature requests. Note that this is all per-cache_dir. What I recommend is a cache_dir with some TB of HDD behind it for approx. GB sized objects. That way they are *not* competeing with many small objects at high churn rate. The cache_dir LRU age could be weeks/months/years if all the big objects are reasonably low popularity. Also, you can size the cache_dir capacities to avoid wastage in the smaller cache_dir from the 2^25 object limitations vs the size of objects stored there. Amos _______________________________________________ squid-users mailing list squid-users@xxxxxxxxxxxxxxxxxxxxx http://lists.squid-cache.org/listinfo/squid-users
