Hi, I reviewed Squid filemap code and it's clear that in some casesa large cache will have high CPU load.filemap.c function file_map_create function starts with 2^13 elementsand expands element number only after the list is full.So for example if cached objects are always slightly below 2^23 and bitmapsize is 2^23 it will take a lot of CPU to find next free bit. Itzcak On Mon, Oct 6, 2008 at 1:05 PM, Henrik Nordstrom<henrik@xxxxxxxxxxxxxxxxxxx> wrote:> On sön, 2008-10-05 at 16:38 +0200, Itzcak Pechtalt wrote:>> When Squid reach several millions of objects per cache dir, it start>> to be very CPU consumer, becuae every insertion and deletion of object>> takes long time.>> Mine don't.>>> On my Squid 80-100GB had the CPU consumption effect.>> That's a fairly small cache.>> The biggest cache I have been running was in the 1.5TB range, split over> a number of cache_dir, about 130GB each I think.>> But it is important you keep the number of objects per cache_dir well> below 2^24. Preferably not more than 2^23.>>> What I think is that you got bitten by something else than cache size..>> Regards> Henrik>
