CentOS - Jan 2017 - Increase CPU usage on HV after upgrade (7.2 -> 7.3)

Hello Gianluca,

Wednesday, January 18, 2017, 3:54:15 PM, you wrote:
> In the mean time, if you have not disabled it, you should find some
> collected statistics from sysstat/sar.
> Look at the sarXX files under /var/log/sa. They should be kept for 30 day
> by default in CentOS 7.
Unfortunately, on that host such statistics is disabled.
> So you can compare cpu, mem, I/O profiles before and after the upgrade.
> If you have access to Red Hat documents you can look also here:
> https://access.redhat.com/articles/325783
> or in general some articles like this:
> https://www.blackmoreops.com/2014/06/18/sysstat-sar-examples-usage/
> and to create pdf graphics with kSar
> https://www.thomas-krenn.com/en/wiki/Linux_Performance_Analysis_using_kSar
> HIH,
> Gianluca
> _______________________________________________
> CentOS mailing list
> CentOS at centos.org
> https://lists.centos.org/mailman/listinfo/centos


-- 
Best regards,
 Subscriber                            mailto:ml-lists at agoris.net.ua

Hello Subscriber,

Thursday, January 19, 2017, 4:44:04 PM, you wrote:
> Hello Gianluca,
> Wednesday, January 18, 2017, 3:54:15 PM, you wrote:
>> In the mean time, if you have not disabled it, you should find some
>> collected statistics from sysstat/sar.
>> Look at the sarXX files under /var/log/sa. They should be kept for 30
day
>> by default in CentOS 7.
> Unfortunately, on that host such statistics is disabled.
But  I  collect  such statistics in Zabbix. And the numbers and graphs
indicate an increase in the load on the CPU (ie System time).

On 01/19/2017 06:54 AM, Subscriber wrote:
> But  I  collect  such statistics in Zabbix. And the numbers and graphs
> indicate an increase in the load on the CPU (ie System time).

"load" has another meaning in the context of POSIX system performance 
counters.  I'm pretty sure you're talking about CPU utilization and not 
"load", right?

Subscriber wrote:
> Hello Gianluca,
>
> Wednesday, January 18, 2017, 3:54:15 PM, you wrote:
>
>> In the mean time, if you have not disabled it, you should find some
>> collected statistics from sysstat/sar.
>> Look at the sarXX files under /var/log/sa. They should be kept for 30
>> day
>> by default in CentOS 7.
>
> Unfortunately, on that host such statistics is disabled.
<snip>
That's surprising. That's such an old, low-level daemon/reporting
tool....
Was it disabled deliberately? And why?

       mark

Hello m,

Thursday, January 19, 2017, 5:17:48 PM, you wrote:
>>> In the mean time, if you have not disabled it, you should find some
>>> collected statistics from sysstat/sar.
>>> Look at the sarXX files under /var/log/sa. They should be kept for
30
>>> day
>>> by default in CentOS 7.
>>
>> Unfortunately, on that host such statistics is disabled.
> <snip>
> That's surprising. That's such an old, low-level daemon/reporting
tool....
> Was it disabled deliberately? And why?
Heritage from the old admin to me.