[Xymon] how to fetch the Xymon max CPU usage value during chosen time period

[ROZEK Michal]

Hi guys,

I would like to know how to fetch, via a command line, the information about the max CPU usage of a chosen server for a chosen time period from its *.rrd  files.

More precisely, I would like to fetch the information from the "vm_cpu" section of the "/soft/xymon/current/server/etc/graphs.cfg" file:

[vm_cpu]
        TITLE VMX: vCPU usage
        YAXIS MHz Used
        DEF:cpuuse=vm_cpu,cpuuse.rrd:lambda:AVERAGE
        DEF:vcpurunning=vm_cpu,vcpurunning.rrd:lambda:AVERAGE
        AREA:cpuuse#00CC00:VM CPU usage
        LINE1:vcpurunning#000000:# of vCPUs running
        COMMENT:\n
        GPRINT:cpuuse:LAST:VM CPU usage \: %5.0lf (cur)
        GPRINT:cpuuse:MAX: \: %5.0lf (max)   <======================== HERE
        GPRINT:cpuuse:MIN: \: %5.0lf (min)
        GPRINT:cpuuse:AVERAGE: \: %5.0lf (avg)\n
        GPRINT:vcpurunning:LAST:#vCPUs running\: %5.0lf (cur)
        GPRINT:vcpurunning:MAX: \: %5.0lf (max)    <======================== HERE
        GPRINT:vcpurunning:MIN: \: %5.0lf (min)
        GPRINT:vcpurunning:AVERAGE: \: %5.1lf (avg)\n

so :

=> GPRINT:cpuuse:MAX: \: %5.0lf (max)
=> GPRINT:vcpurunning:MAX: \: %5.0lf (max)


I was having fun with the "rrdtool fetch …", but the result is not so comprehensible for me… I have found a topic "Top ten list of servers wrt cpu load" on Your mailing list, but it doesnt solve my problem.
What I tried is:


rrdtool fetch vm_cpu.rrd AVERAGE --start 1378040857 --end 1378213657 | awk '{print $3}' |sort



Few questions here:



1.) Should I use the vm_cpu.rrd file? Or vm_cpu,cpuuse.rrd or vm_cpu,vcpurunning.rrd?



Here are the files present on the server:



[root at vt2043]# ls -l | grep -i cpu

-rw-r--r-- 1 xymon xymon  19640 Apr 18 13:43 vm_cpu,cpuuse.rrd

-rw-r--r-- 1 xymon xymon  38624 Sep  3 18:32 vm_cpu.rrd

-rw-r--r-- 1 xymon xymon  19640 Apr 18 13:43 vm_cpu,vcpurunning.rrd



2.) How to understand the result ? There is a lot of numbers like:



-8.1787151835e-04

-8.3830185734e-03

8.4392892148e-03

8.5398628456e-03

9.1766240439e-04

-9.6038714038e-03

9.9081238031e-04

-9.9143698154e-04



3.) Is it a good way of fetching the max cpu usage value from the server ?

Thanks for Your help in advance.

Je reste à votre disposition pour tout complément d'informations. Cordialement.
Regards / Z poważaniem / تحية خالصة / 敬礼

Michal Rozek


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