Extended UCD/Net CPU Usage

[divagater]

Hey all. This CPU usage template and script works with any number of CPU's and cores always displaying roughly 100% total usage. The perl script that does the collections looks at the delta in cpu time over elapsed time to ajust all the values to a 100% scale. The results should closely match what is seen in top or sar.

This template is loosely based on the templates found here: http://code.google.com/p/mysql-cacti-te ... xTemplates. Mostly I am just copying the look and feel as those templates use ssh to cat /proc/cpu info and I am working only over snmp.

The perl script requires the SNMP package. The export was done on Cacti 0.8.7d and requires that SNMP return the following counters:

[root@exlap600 npc]# snmpwalk -c m0n1t0rm3 -v 2c exlap606 .1.3.6.1.4.1.2021.11 | grep ssCpuRaw
UCD-SNMP-MIB::ssCpuRawUser.0 = Counter32: 2806463526
UCD-SNMP-MIB::ssCpuRawNice.0 = Counter32: 10078058
UCD-SNMP-MIB::ssCpuRawSystem.0 = Counter32: 493131292
UCD-SNMP-MIB::ssCpuRawIdle.0 = Counter32: 3841599494
UCD-SNMP-MIB::ssCpuRawWait.0 = Counter32: 1312103365
UCD-SNMP-MIB::ssCpuRawKernel.0 = Counter32: 491410448
UCD-SNMP-MIB::ssCpuRawInterrupt.0 = Counter32: 1720844
UCD-SNMP-MIB::ssCpuRawSoftIRQ.0 = Counter32: 0

Cheers,
Billy

[codemann]

Works good on a recent Dual/Quad Core CPU, but doesn't work on an older Xeon 3Ghz with Hyperthreading.

The reason is that that CPU doesn't return the $irq value, giving this error :

Can't call method "val" on an undefined value at extended_cpu.pl line 71.

[edit]
This seems to be because of the older NET-SNMP version, I think you need 5.3 at least for this, and the older server still has 5.0.9. I'm going to update it and I'll let you know if it works.
[/edit]

[divagater]

Works good on a recent Dual/Quad Core CPU, but doesn't work on an older Xeon 3Ghz with Hyperthreading.

The reason is that that CPU doesn't return the $irq value, giving this error :

Can't call method "val" on an undefined value at extended_cpu.pl line 71.

[edit]
This seems to be because of the older NET-SNMP version, I think you need 5.3 at least for this, and the older server still has 5.0.9. I'm going to update it and I'll let you know if it works.
[/edit]

Just uploaded a new version that should take care of that issue. You only need to replace the script. The template is unchanged.

Cheers,
Billy

[codemann]

I updated the script, but we're also planning on updating the NET-SNMP.

[codemann]

Update: it doesn't really work with the updated script on the older server. I'm going to update the NET-SNMP probably next week, I'm very busy at the moment with other issues.

[sumsum]

hello

If I start the perl script manual, sometimes i get errors :

Code: Select all

vmonster:/usr/share/cacti-0.8.7g/scripts# perl extended_cpu.pl -C cacti -v 2 -p 161 -H localhost
Illegal division by zero at extended_cpu.pl line 99.

I guess it is because the CPU Nice Value is sometimes 0.

I'm running Debian Lenny 64bit in a Quadcore i7 CPU 860 @ 2.80GHz with NET-SNMP version: 5.4.1
I think there seams to be something not right. Has anyone a suggestion, where I need to look into ?

The graph it self looks like this after a while.