[squid-users] High utilization of CPU squid-3.5.23, squid-3.5.24

[Yuri Voinov]

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: eliezer at ngtech.co.il
>
>
> -----Original Message-----
> From: squid-users [mailto:squid-users-bounces at lists.squid-cache.org] On Behalf Of Vitaly Lavrov
> Sent: Wednesday, February 1, 2017 10:56 PM
> To: squid-users at 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 at lists.squid-cache.org
> http://lists.squid-cache.org/listinfo/squid-users
>
> _______________________________________________
> squid-users mailing list
> squid-users at lists.squid-cache.org
> http://lists.squid-cache.org/listinfo/squid-users

-- 
Bugs to the Future
-------------- next part --------------
A non-text attachment was scrubbed...
Name: 0x613DEC46.asc
Type: application/pgp-keys
Size: 2437 bytes
Desc: not available
URL: <http://lists.squid-cache.org/pipermail/squid-users/attachments/20170202/5e28791c/attachment.key>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 473 bytes
Desc: OpenPGP digital signature
URL: <http://lists.squid-cache.org/pipermail/squid-users/attachments/20170202/5e28791c/attachment.sig>