CPU performance monitor?

[1984]

Hi,

I'd like to write a module which displays CPU and memory usage to the user similar to what is visible in the task manager / performance monitor window. I have found >>>this<<< article which is cool, but not quite what I need. See the chart below:

My PC has 4 cores with 2 logical cores each, so I put 8 graphs on the chart each representing the load of a given logical processor. Then (at about the middle) I launched a VI which has nothing but a while loop with a false constant at its conditional terminal. 

In the task manager I saw what I expected: one of the cores got compeletely busy with the VI so the CPU load increased to about 25% and stayed there (I didnt have any other load on the CPUs except this VI so 25-26% looks good). In my VI though the logical cores went up and down and it was not even that a given core take the full load, but it seems the task changed cores. I dont know if this is possible at all, I'm not an expert on this subject, but this is what my graph suggests.

What I have in my VI could have more details, but for me and for a regular user is a lot less informative, so I'm wondering if there is a way to get values diplayed by the task manager directly?

(Using Windows11. I took a sample from the CPU load in every 1000ms and displaying the average of the last four samples)

Thanks.

[Andrey_Dmitriev]

I using pdh.dll to obtain these counters:

and they matched Task Manager values (more or less, you might need to have some minor averaging and rescaling to get 1:1 visual appearance):

Andrey.

[1984]

Could you convert this back to LV2022?

[Andrey_Dmitriev]

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@1984 wrote:

Could you convert this back to LV2022?

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Yes, sure, downgraded to LV2022 in attachment.

[alexderjuengere]

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@1984 wrote:

I'm wondering if there is a way to get values diplayed by the task manager directly?

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you can get the taskmanager values via windows' perfmon.exe, which is part of Windows 11

perfmon can also be used to create a logfile

but the whole .exe is sort of clumsy to use.

a good soul wrote this dot net wrapper for LabView, which I tested with LabView 2020 64bit and Windows 10

https://forums.ni.com/t5/Example-Code/Performance-Monitor-Using-LabVIEW/ta-p/3501988

[GerdW]

Hi Andrey,

what about a VI version for the pre-subscription era?

Could you downconvert to LV2019 or LV2021?

Thanks!

[Andrey_Dmitriev]

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@GerdW wrote:

Hi Andrey,

what about a VI version for the pre-subscription era?

Could you downconvert to LV2019 or LV2021?

Thanks!

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You're welcome! Attached in LabVIEW 2018. That was an issue with 32-bit, because 64 bit was hard coded, but now should work for both 32-bit and 64-bit LabVIEW.

In general its doesn't matter how performance counters are obtained, in theory the .net - based solution should output exactly the same measurements. But usually if a have a choice to stay dependent from pure DLL or .net assembly, then I choosing DLL (in the past got some troubles with very old code and .net).

On the other hand, on Windows 11 I have seen some strange differences in term of CPU load and memory usage appeared in Task Manager compared to other tools like SysInternals.

Andrey.

[GerdW]

Hi Andrey,

thanks for your effort, but with LV2021/32bit on Win11Pro22H2 I don't get any useful CPU load data, just "zero" load for all cores.

I have to investigate that behaviour when I have some more time…

[1984]

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@Andrey_Dmitriev wrote:

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@1984 wrote:

Could you convert this back to LV2022?

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Yes, sure, downgraded to LV2022 in attachment.

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Hey Andrey. Actually same here, your code does not work on my PC (win11). The dll call throws an error even if I browse the dll and add it to the call library node.

[Andrey_Dmitriev]

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@GerdW wrote:

Hi Andrey,

thanks for your effort, but with LV2021/32bit on Win11Pro22H2 I don't get any useful CPU load data, just "zero" load for all cores.

I have to investigate that behaviour when I have some more time…

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Ah, its because you're under non-English OS with very big probability. For example, for German it should be "\\Prozessor(%d)\\Prozessorzeit (%%)" instead of "\\Processor(%d)\\%% Processor Time". Or, better, to use language neutral PdhAddEnglishCounterA() function. Good to know, thank you.

Try attached one, probably should work for you: