CPU usage on 2, 4 and 8 way Linux devices

fmangeant · **Posted:** Mon Aug 14, 2006 7:41 am

Hi all

here are some data & graph templates for multiple CPU Linux devices.
Indeed, Net-SNMP under Linux returns counters whose values range from 0 to (100 x number of logical CPU).

More and more systems use dual core, hyper threading, etc. so the default template which ship with Cacti doesn't work.

To know how many logical CPU are seen by Linux, run this command :

Code:

$ grep -c ^processor /proc/cpuinfo
2

The graph templates do not use the "Auto Scale" functionnality, they are fixed between 0 and 100 percent.

These templates require Cacti 0.8.6h

alexb · **Joined:** Tue Nov 29, 2005 12:34 pm **Posts:** 3

Good stuff...
I think you need to remove maximum value of 100 from data templates for ucd/net - CPU Usage, it can go beyond 100 on SMP systems.

AlexB

fmangeant · **Posted:** Wed Aug 30, 2006 4:52 am

Hi

alexb wrote:

I think you need to remove maximum value of 100 from data templates for ucd/net - CPU Usage, it can go beyond 100 on SMP systems.

that's why I made these templates

They use CDEF to divide each counter by the number of processors.

janeller · **Joined:** Fri Sep 01, 2006 2:27 pm **Posts:** 1

great job, thank you very much!
before installing your template the processor load from the dualcore cpu has been showed like the scales from top in ssh multiplicated with 2... :-?

kamina · **Joined:** Tue Aug 22, 2006 3:19 am **Posts:** 28

I added io-wait to these graphs, but they seem disproportionate. Should I also be using the division for them? They seem to correlate with top better when I leave them without division.

edit:

I think I'm mistaken, it does need to be divided

fmangeant · **Posted:** Fri Sep 08, 2006 10:15 am

I think so.

kamina · **Joined:** Tue Aug 22, 2006 3:19 am **Posts:** 28

I finally managed to get io-wait which was consistant enough to judge from the averige, it definatly does need to be divided.

mr_chip · **Joined:** Mon Sep 18, 2006 3:35 pm **Posts:** 3

Crap. I applied these templates and now every single graph in my cacti installation is blank.

My RRD's are still updating, the cacti log has nothing since I've done the change, and I'm stumped. Any ideas?

fmangeant · **Posted:** Tue Sep 19, 2006 10:56 am

Hi

did you have any error (like "dependancy not met") when importing the templates ?

Viper · **Joined:** Wed Oct 11, 2006 8:51 am **Posts:** 3

Hello !
I see "Error: XML: Hash version does not exist." when importing the templates .
What the problem ?

fmangeant · **Posted:** Wed Oct 11, 2006 9:13 am

Hi

these templates were exported from Cacti 0.8.6h, so you need at least this version to import them.

What version are you running ?

Viper · **Joined:** Wed Oct 11, 2006 8:51 am **Posts:** 3

fmangeant wrote:

Hi

these templates were exported from Cacti 0.8.6h, so you need at least this version to import them.

What version are you running ?

Thaks ! i use Cacti Version 0.8.6c.

fmangeant · **Posted:** Wed Oct 11, 2006 9:30 am

If you have a large Cacti installation, 0.8.6i (released yesterday) is for you

Viper · **Joined:** Wed Oct 11, 2006 8:51 am **Posts:** 3

fmangeant wrote:

If you have a large Cacti installation, 0.8.6i (released yesterday) is for you

A lot of thanks )

xpbit · **Joined:** Fri Sep 29, 2006 3:34 pm **Posts:** 20

im not getting any data for the 4 way graph. no errors in the poller either. any ideas? it doesnt say nan just 0.00

CPU usage on 2, 4 and 8 way Linux devices

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