[Xymon] Fwd: About CPU load (OPEN)

[oyvind.bjorge at telenor.com]

To be able to estimate this it is good to understand what this load value is showing.
There is plenty of people that has explained this in a better way than I’m able to (This is one example: http://en.wikipedia.org/wiki/Load_(computing)), but still I will give you my very simplified understanding.
The load is number of tasks in the runque. In my head, to utilize your resources perfectly, the value 1 for single CPU would be good, since than there should be minimal delay, but still there is always something to do for the CPU. If the value are > 1 for a single cpu, than there will be wait time for tasks to be done. This is not necessary an issue, depending on what the machine is used for, and the world is not perfect, so this will not always be the same. Therefor it also is an average value we are monitoring. A long que for a short time is normal and the reason we have ques. Problem is if the que over time is longer than the cpu can process giving delay and degraded performance. Again, what is acceptable for one machine is depending on the tasks it shall do.



From: xymon-bounces at xymon.com [mailto:xymon-bounces at xymon.com] On Behalf Of Novosielski, Ryan
Sent: 7. april 2013 23:27
To: 'operaciones at corpresa.com'
Cc: 'xymon at xymon.com'
Subject: Re: [Xymon] Fwd: About CPU load

Others may have some ideas. I think no, just set it too low (I use the default value to start generally) and wait for it to get annoying and raise it accordingly.



From: Operaciones [mailto:operaciones at corpresa.com]
Sent: Sunday, April 07, 2013 12:22 PM
To: Novosielski, Ryan
Cc: 'xymon at xymon.com' <xymon at xymon.com<mailto:xymon at xymon.com>>
Subject: Re: [Xymon] Fwd: About CPU load

Thank you Ryan, one ask, are there eny way for calc this?, or you suggest taht the better way is testing in each server?
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]
Sent: Sunday, April 07, 2013 10:58 AM
To: Xymon List <xymon at xymon.com><mailto:xymon at xymon.com>
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><mailto:operaciones at corpresa.com>

Para:

xymon at xymon.com<mailto:xymon at xymon.com>



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.


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