I dropped the cache size to 150 GB instead of 300 GB. Cached object count dropped from ~7 million to ~3.5 million. After a week I saw one occurrence of the same problem. CPU usage climbed steadily over 4 hours from <10% to 100%, then squid became unresponsive for 20 minutes. After that it picked up as if nothing had happened -- no error messages in any logs, no restarts, no core dumps.
I'm now testing again using version 3.3.5-20130607-r12573 instead of 3.2.11-20130524-r11822. I've left everything else the same, with the cache size still at 150 GB. Mike Mitchell On 30/05/2013 08:43:24 -0700, Ron Wheeler wrote: > Some ideas here. > http://www.freeproxies.org/blog/2007/10/03/squid-cache-disk-io-performance-enhancements/ > http://www.gcsdstaff.org/roodhouse/?p=2784 > > > You might try dropping your disk cache to 50Gb and see what happens. > > I am not sure that caching 7 Million pages gives you much of an advantage > over 1 million. The 1,000,001th most > popular page probably does not come up > that often and by the time you get down to a page that is 7,000,000 in the > list of most accessed pages, you are not seeing much demand for that page. > > Probably most of the cache is just accessed once. > > Your cache_mem looks low but is not related to your problem but would improve > performance a lot. Getting a few > thousand of the most active pages in > memory is worth a lot more than 6 million of the least active pages sitting > on a disk. > > > I am not a big squid expert but have run squid for a long time. > > Ron
