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

[Yuri Voinov]

It seems as IO bottleneck at first look.

02.02.2017 2:55, Vitaly Lavrov пишет:
> 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
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-- 
Bugs to the Future
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