Difference between CPU usage and CPU utilization ?

NenadV

Hello,

could you pls clarifty the difference between "CPU usage" and "CPU utilization" metrics for IBM Power Systems ?

Regards,

Nenad

Pavel

Hi,

ok, you testing Xormon NG where it is used, but not documented yet.

Shortly:

CPU usage: CPU allocation to a partition (it is how HMC/server sees it)

CPU utilization: real CPU usage by processes, it is always lower (it is how the OS sees it), the OS unused asigned CPU utlize by CPU idle cycles

In fact: CPU usage = CPU utilisation + CPU idle cycles

There are 2 views for using of CPU, both are important

Is that clear enough?

Pavel

btw upgrade to the latest version if you want to test it, pls let us us know any feedback if possible, thanks :)

https://xormon.comdownload-static/xormon-ng/xormon-ng-0.6.58.tar.gz

uprade is easy, do it via the UI --> settings --> upgrade

we are finishing it, bud there is still a lot of cosmetic issues to fix, finale release is schedulled in a few weeks.

NenadV

Hello Pavel,

are you sure it's not vice versa - i.e. CPU utilization are number of virtual CPUs allocated by partition (LPAR) and CPU usage is actual CPU usage of this CPUs - I'm comparing CPU utilization from current version of xormon and CPU usage from xormonNG and utilization is always higher.

Also could you provide another link for the latest xormonNG update - the one above doesn't work for me.

Regards,

Nenad

Pavel

sorry, there was missing a slash in the link: https://xormon.com/download-static/xormon-ng/xormon-ng-0.6.58.tar.gz

IBM Power LPAR/CPU pool: CPU utilization in lpar2rrd/xormon should be equal to CPU usage in Xormon NG

NenadV

Hello,

in our case CPU utilization in lpar2rrd is significantly higher than CPU usage in XormonNG. (pls check the pictures below). Also there is no data displayed/collected for CPU utilization in XormonNG (see the screenshot).

Regards

Pavel

CPU utilization: it might not be supported on old servers/HMCs, could that be the case? What is your env based on? what Power technology?

CPU usage: the biggest server in Xormon (51.69), which one it is in Xormon NG graph (color)?

NenadV

Hello,

we are running Power8,9 and 10 generations. Biggest server in xormon is Power 10 enterprise server ( 1080).

The reason I'm suggesting that CPU usage should be bellow CPU utilization is that "CPU usage" in xormonNG is comparable with "CPU usage" mectrics in Power HMC console

Regards,

Nenad

Pavel

if you compare the biggest server as per utilization (the one with 50 cores running)

what presents Xormon NG? X times less utilisation as I see the the biggest one running on 20 CPU cores in NG.

Is that the same server?

If so, there is 30 Core difference, can you confirm it?

NenadV

Hello Pavel,

here are screens from Xormon and XormonNG for the same biggest P10 server covering roughly same timeframe yesterday afternoon:

Pavel

send us via email ( support at lpar2rrd dot com ) these daily graphs from this server from both tools, Xormon and Xormon NG

• CPU pool graph
• CPU Total
• VM aggregated
• what is CPU count in that server, 96 or 94?

Thanks!

NenadV

sent an email with screenshots ....