[Xymon] Fwd: About CPU load

[Ralph Mitchell]

You can handle load spikes with the DURATION keyword in alerts.cfg.  The
client normally samples every 5 minutes, so if a spike generally lasts for
two samples you could set DURATION>13 to get alerts sent out on the 3rd
sample.

Ralph Mitchell



On Mon, Apr 8, 2013 at 4:36 AM, Iain M Conochie <iain at shihad.org> wrote:

> On 2013-04-07 17:22, Operaciones wrote:
>
>> Thank you Ryan, one ask, are there eny way for calc this?, or you
>> suggest taht the better way is testing in each server?
>>
>
> Load average is a logarithmic method of measuring the run queue on your
> system. The output of the 3 values gives you the run queue over 1 minute, 5
> minutes and 15 minutes respectively.
>
> An old rule of thumb was to have a load average of not greater than 2 per
> cpu, but this is generally site dependent. Are you going to be sending out
> alerts for a high load? Do you _really_ want to be woken at 2AM cos the
> backup job has spiked the load?
>
> I would advise you set the threshold a bit higher for your system (perhaps
> 8.0 and 16.0, based on 4 cores) and then after a suitable time period
> (perhaps 2 weeks) you can look at the CPU load graph to see what kind of
> usage the system has and adjust accordingly. During this time you probably
> don't want to send out alerts (but perhaps you do; your call :) IMO,
> normally a spike in load is not an issue, but a a system that over 6 months
> has an ever increasing load is a problem. This is where the trends analysis
> function comes into it's own.
>
> OF course load spikes can impact performance, but it is hard to gauge
> exactly what that impact is from the load average alone.
>
> Cheers
>
> Iain
>
>
>
>> El 07/04/13 18:16, Novosielski, Ryan escribió:
>>
>>  This default is a reasonably nice default for a single CPU system,
>>> but this is really a parameter that is site-dependent. For example,
>>> I have a 24 CPU compute server. A load of 5 is hardly breaking a
>>> sweat. In some cases, high load doesn't even affect the system and
>>> you wouldn't want to be notified until a normally unreasonably high
>>> value. I'd suspect 10.0 15.0 for your system or 15.0 20.0 might not
>>> be a bad guess.
>>>
>>>
>>>
>>> FROM: Operaciones [mailto:operaciones at corpresa.**com<operaciones at corpresa.com>[1]]
>>> SENT: Sunday, April 07, 2013 10:58 AM
>>> TO: Xymon List <xymon at xymon.com> [2]
>>> SUBJECT: [Xymon] Fwd: About CPU load
>>>
>>>
>>> I forget, the default params that appear in this file are:
>>>
>>> LOAD    5.0 10.0
>>>
>>> Thank you, best regards.
>>>
>>> -------- Mensaje original --------
>>>
>>> ASUNTO:
>>> About CPU load
>>>
>>> FECHA:
>>>
>>> Sun, 07 Apr 2013 16:56:32 +0200
>>>
>>> DE:
>>> Operaciones <operaciones at corpresa.com> [3]
>>>
>>> PARA:
>>> xymon at xymon.com [4]
>>>
>>>
>>> Hello,
>>>
>>> I'm using xymon 4.3.5, my as is the follow:
>>>
>>> Is correct the default params that appear on "analysis.cfg" for
>>> chect the cpu load in case that the server have 4 cores (intel xeon
>>> 1230)?, can i use this values for anyone CPU types?
>>>
>>> Thank you, best regards.
>>>
>>
>>
>>
>> Links:
>> ------
>> [1] mailto:operaciones at corpresa.**com <operaciones at corpresa.com>
>> [2] mailto:xymon at xymon.com
>> [3] mailto:operaciones at corpresa.**com <operaciones at corpresa.com>
>> [4] mailto:xymon at xymon.com
>>
>
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