On 01/15/2018 08:22 AM, Amos Jeffries wrote: > AIUI, SMP-mode rock operates as a fully separate process (a "Disker" > kid) which delivers its results as objects already in shared memory > to the worker process. Yes, disk hits are delivered to workers via shared memory, but... > There should be little or no gain from that promotion process anymore - I disagree: A disk hit is still a lot slower than a memory hit because a disk hit involves reading from a disk, which is a major performance bottleneck. The shared memory pages used to deliver disk hits to workers are then reused for delivering other disk hits. Those pages are not a part of a cache. Ideally, those pages could be added to (swapped with) the memory cache pages (to avoid memory copying; when other conditions are met), but Squid does not have the code to do that yet. We do not even have the code to serve hits from shared memory -- we copy the bytes from shared to local memory first. Alex. _______________________________________________ squid-users mailing list squid-users@xxxxxxxxxxxxxxxxxxxxx http://lists.squid-cache.org/listinfo/squid-users
