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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