Re: [squid-users] 3x cpu usage after upgrade 3.1.20 to 3.3.8

On 27/10/2013 2:54 a.m., Omid Kosari wrote:
> After upgrade to 3.3.8 from 3.1.20 the cpu usage of squid grows triple times
> without change to config .
> Please look at attached image of cacti graph
>
> <http://squid-web-proxy-cache.1019090.n4.nabble.com/file/n4662906/cpu_usage.png>
>
> my configs are available in following posts
> http://squid-web-proxy-cache.1019090.n4.nabble.com/Squid-naps-each-3600-seconds-tp4662811.html
> http://squid-web-proxy-cache.1019090.n4.nabble.com/rock-questions-tp4662816.html
> http://squid-web-proxy-cache.1019090.n4.nabble.com/rock-problem-on-each-squid-restart-tp4662864.html

Is workers enabled on the 3.3 version? or exactly the same
3.1-compatible non-SMP confg file?

* 3.1 version cannot consume more than 100% on a single core. Which in
multi-core systems shows as a low % of total CPU.
  3.3 with SMP workers can use up to 100% on N cores, which shows up as
up to 100% of total CPU.

* rock store scans the storage DB file to load cache index. This can
take a lot more CPU immediately after startup than other disk storage
types do. 3.1 does not supprot rock and so will not show that behaviour.

Amos
Received on Sat Oct 26 2013 - 16:27:48 MDT