Yes, it is require to perform extended diagnostics. Including the system level.
BTW, it can also network IO. And, it is possible that even a slow DNS. Have to search. 02.02.2017 3:34, Eliezer Croitoru пишет: > I believe that the squid manager info page should give some clue about the > number of concurrent requests. > > If it's above some number(300-400 and above) per second then removing the > cache_dir from the server for a windows of a day will answer if it's a DISK > IO bottle neck or something else. > > All The Bests, > Eliezer > > ---- > Eliezer Croitoru > Linux System Administrator > Mobile: +972-5-28704261 > Email: elie...@ngtech.co.il > > > -----Original Message----- > From: squid-users [mailto:squid-users-boun...@lists.squid-cache.org] On > Behalf Of Vitaly Lavrov > Sent: Wednesday, February 1, 2017 10:56 PM > To: squid-us...@squid-cache.org > Subject: [squid-users] High utilization of CPU squid-3.5.23,squid-3.5.24 > > Periodically squid begins to linearly increase the use of the CPU. > Sometimes this process reaches 100%. At random moment of time the CPU usage > is reduced to 5-15%, and in the presence of client requests can again start > linearly increasing use of CPU. > > In the protocols are no error messages. > > CPU consumption does not correlate with the number of requests and traffic. > > The increase CPU consumption from 0 to 60% occurs in about 4-5 hours, and to > 100% for 6-8 hours. > > A typical graph of CPU usage can be viewed on > http://devel.aanet.ru/tmp/squid-cpu-x.png > > With the "perf record -p` pgrep -f squid-1` - sleep 30" I have received the > following information: > > At 100% CPU load most of the time took 3 calls > > 49.15% squid squid [.] MemObject :: dump > 25.11% squid squid [.] Mem_hdr :: freeDataUpto > 20.03% squid squid [.] Mem_hdr :: copy > > When loading CPU 30-60% most of the time took 3 calls > > 37.26% squid squid [.] Mem_node :: dataRange > 22.61% squid squid [.] Mem_hdr :: NodeCompare > 17.31% squid squid [.] Mem_hdr :: freeDataUpto > > What is it ? Is it possible to somehow fix it? > > System: slackware64 14.2 > > sslbump not used. http only. > > Part of config: > > memory_pools off > memory_pools_limit 512 MB > cache_mem 768 MB > maximum_object_size_in_memory 64 KB > cache_dir ufs /cache/sq_c1 16312 16 256 > cache_dir ufs /cache/sq_c2 16312 16 256 > cache_dir ufs /cache/sq_c3 16312 16 256 > _______________________________________________ > squid-users mailing list > squid-users@lists.squid-cache.org > http://lists.squid-cache.org/listinfo/squid-users > > _______________________________________________ > squid-users mailing list > squid-users@lists.squid-cache.org > http://lists.squid-cache.org/listinfo/squid-users -- Bugs to the Future
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