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Hi
It may be the wrong place to ask for it, but I am not sure where to go with this question.
Does anyone have an idea why Azure Virtual Machine "Monitoring" does not reflect real observed CPU usage? Here is what I can see on Azure VM Overview/Monitoring:
(~30% usage most of the time, one 77% peak)
And here you can see how it looks like from inside of the VM (constant 100% CPU):
Do you know how to see real data on the Azure GUI that the VM is 100% CPU all the time?
Hi,
From inside the VM you have probably opened a view that shows the cpu usage only on one of the cores. The graphic from Azure shows average CPU across all cores of the VM.
Please "Accept the answer" if the information helped you. This will help us and others in the community as well.
Thanks for looking at this, stan.
Unfortunately no, this is not the case. It is a B2ms instance, 2 VCPUs, you see all of the cores on the screenshot.
Any other ideas?
As this is B-series VM it could be that you have exhausted your CPU credits and you do not have the full CPU capabilities . May be the [closest explanation for this you can find here1 as it shows example. Basically when you exhaust your credits CPU usage will be throttled from outside so from outside you will not see high CPU usage but from inside you will see it as the VM from inside it does not know it is throttled, the VM is using the CPU that is given to it from Azure. The only way Azure can control how much CPU is used by setting the limit from outside so the VM does not know that is throttled. You can check metric CPU credits remaining for the VM and see if it is 0 or around 0.
Update: Do not worry. The graph is reflecting the reality but the CPU is seen from the Hyper-V host on the VM. Of course from inside the usage is different. Of course this kind of behavior is only applicable for such kind of VMs. If you want you can enable monitoring within the guest via data collection rules. That way you will have capability to monitor from inside as well.
Please "Accept the answer" if the information helped you. This will help us and others in the community as well.
Thanks, stan!
It is constant at around 1.8 (VM is 100% CPU all the time)
Looking at "Base CPU Perf of VM" for B2ms it is 60%, so assuming 2x vCPU running at max 60% it gives 36% max without credits available which seems quite correct on the graph (if my calculations/assumptions are correct).
Even if the 0 credits are the case here, I would expect to see that from the inside the CPU is maxed out.
Right now looking at the graphs I can assume, that there is no utilization problem whatsoever because the graph shows it is around 40%.
Now I started to freak out that all of my burstable Azure VMs can be maxed out, and the CPU performance graphs are not reflecting the reality ;)
Do not worry. The graph is reflecting the reality but the CPU is seen from the Hyper-V host on the VM. Of course from inside the usage is different. Of course this kind of behavior is only applicable for such kind of VMs. If you want you can enable monitoring within the guest via data collection rules. That way you will have capability to monitor from inside as well.
Hi @MB
I recommend you view the graph with Percentage CPU in Max, instead of Avg.