How to monitor PXI CPU utilization?

[sgregor249]

Does anybody know of a way to programatically monitor CPU utlization on a PXI controller through LabVIEW? I know that NI had a proprietary VI to monitor memory usage called rtgetmemorysummary.vi to monitor memory usage, and I want to do the same for CPU usage.

[sgregor249]

bump

[Ben]

If memory serves me, I was only able to do that by connecting a display to the CPU.

Ben

[MarcoMauri · Accepted solution]

If you are speaking of a RT targer, then you can use

RT get CPU loads.vi

See here

Marco

[sgregor249]

Thanks MarcoMauri thats exactly what I needed. I looked around NIs site and found out this this VI only appears on the palette if you are coding under an RT target.

[sgregor249]

This seems to only be available in LV 8.6+. My immediate needs are for LV 8.5, but this might prove useful for code that I need to support in 8.2 as well. Is there any way an NI applications engineer can backsave this for me? I see that it requires  ni_emb.dll and NI_Real-Time Target Support.vi. Shoot, on second thought I have a Main VI that runs both on windows systems and RT systems and introducing this to the windows system would cause the code to break. Perhaps I could use a conditional disable with target type to avoid this.

[GoCougs]

Unfortunately this function is not supported in LV 8.5 and to downgrade it to previous versions would, short story, break a lot of things.  Do you have a hardware limitation for being unable to have LVRT 8.6 on your target?

[sgregor249]

No hardware reason to not upcovert. It's more of a risk thing, plus it's not my decision.

The reason I wanted to log PXI CPU utilization was beacuse one of the PXIs in a 5 PXI system seems to randomly reboot about once a week. We've been replacing pieces of the system part by part(chassis, controller, cards) and verifying the electrical system(the only thing left is the PXI Power cable). I don't think it's the software because the same code runs on all 5 PXIs. The CPU utilization might be useful in getting to the bottom of this, but I doubt its the culprit. I would only argue for upgrading to LV 8.6 if we've exhausted all other options first.

[Ben]

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sgregor249 wrote:

No hardware reason to not upcovert. It's more of a risk thing, plus it's not my decision.

The reason I wanted to log PXI CPU utilization was beacuse one of the PXIs in a 5 PXI system seems to randomly reboot about once a week. We've been replacing pieces of the system part by part(chassis, controller, cards) and verifying the electrical system(the only thing left is the PXI Power cable). I don't think it's the software because the same code runs on all 5 PXIs. The CPU utilization might be useful in getting to the bottom of this, but I doubt its the culprit. I would only argue for upgrading to LV 8.6 if we've exhausted all other options first.

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If that chassis is a RT target then that is one of the signatures of a memory leak. When you run out of memory in a RT app it reboots.

Ben

[sgregor249]

The RT machine is running a build. We have code to log memory utilization and it doesn't increase prior to the restart.