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Device-IO plugin - How to compute the cpuUtilisation?

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Raymond Angelo Gonzales
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The content of this FAQ has been updated and migrated to the following topics in docs.itrsgroup.com. Refer to the following:

https://docs.itrsgroup.com/docs/geneos/current/data-collection/device-io.html#View_(Linux)_..975

 

In Linux Netprobe versions GA3.0.21 and up:

cpuUtilisation = ((tot_ticks new - tot_ticks old) / (jiffies new - jiffies old)) * 10 

Linux

The values can be seen by enabling the Device-IO sampler's all debug setting (i.e. *). Attached is the sampler configuration: device-io_with_debug.xml

Below is a netprobe log snippet with the all debug enabled:

<Wed Jan 4 16:10:21> DEBUG: DEVICEIO[Device-IO] generate -- device 'sda':
<Wed Jan 4 16:10:21> DEBUG: DEVICEIO[Device-IO] Time(Jiffies): old(613442636) new(613440629) -> diff(2007)
<Wed Jan 4 16:10:21> DEBUG: DEVICEIO[Device-IO] tput: old(79041267), new(79041547) -> diff(280.000000) -> 13.951171
<Wed Jan 4 16:10:21> DEBUG: DEVICEIO[Device-IO] tot_ticks: old(200303693) new(200304587) -> diff(894) -> 44.54
<Wed Jan 4 16:10:21> DEBUG: DEVICEIO[Device-IO] await: old(764496285) new(764517331) -> diff(21046) -> 75.164286
<Wed Jan 4 16:10:21> DEBUG: DEVICEIO[Device-IO] arqsz: old(2149335067) new(2149342315) -> diff(7248) -> 75.164286
<Wed Jan 4 16:10:21> DEBUG: DEVICEIO[Device-IO] rd_ios: old(542740) new(542740) -> diff(0) -> 0.00
<Wed Jan 4 16:10:21> DEBUG: DEVICEIO[Device-IO] wr_ios: old(78498527) new(78498807) -> diff(280) -> 13.95
<Wed Jan 4 16:10:21> DEBUG: DEVICEIO[Device-IO] rd_sectors: old(25652421) new(25652421) -> diff(0) -> 0.00
<Wed Jan 4 16:10:21> DEBUG: DEVICEIO[Device-IO] wr_sectors: old(2123682646) new(2123689894) -> diff(7248) -> 361.14
<Wed Jan 4 16:10:21> DEBUG: DEVICEIO[Device-IO] rq_ticks: old(763830349) new(763851395) -> diff(21046) -> 1048.63

From the logs, the device sda's cpuUtilisation should be equal to 4.45% as seen in the dataview below:

 

We recommend that you always use the latest document version in https://docs.itrsgroup.com/ to keep you up-to-date.

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