Strange Combo Box CPU Usage

[bkling]

I've been having some odd behaviour with combo box behaviour in LV8.2.  When the mouse is hovering over the combo box and the down key on the keyboard is pressed, the CPU usage goes to 100%.  Moving the mouse off of the combo box causes the CPU usage to drop. 
Does anyone have any insight as to why this is happening or, hopefully, how this can be fixed?
thanks,
bryan

[RavensFan]

You're doing this without actually running the VI, correct?

I see a similar thing in LV 8.5, but only ~50%.  But my PC has 2 cores.

[smercurio_fc]

Unfortunately, the problem doesn't seem limited to the LabVIEW Combobox. The System Combobox does the same thing, so this looks like a LabVIEW issue with these types of controls. You can try using a Menu Ring instead.

[bkling]

Yes, this problem exists with the vi running and without the vi running.
I'm using a combo box in my application so that when the user begins typing the combo box will auto complete based on items in the array; i don't think that this is possible with any other control... or is this?
bryan

[bkling]

oh, i've tried this on two PCs as well, one with dual cores.  One the dual core machine one of the cores goes to 100% (giving a total usage of 50% as ravens fan noticed).  One the single core the CPU goes to 100%

[RavensFan]

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bkling wrote:
oh, i've tried this on two PCs as well, one with dual cores.  One the dual core machine one of the cores goes to 100% (giving a total usage of 50% as ravens fan noticed).  One the single core the CPU goes to 100%

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Actually what was kind of odd about mine was that the usage was 50%, but the 2 windows showing each core seemed to mirror each other and were both showing about 50% as well.  Not sure what that means.

[smercurio_fc]

On my system I saw something different. I have a single CPU with hyperthreading turned on. What I saw was one "CPU" go to 50%. The other monitor stayed pretty much idle. Odd.

[Aashish_M]

Hi bkling,

This was reported to R&D (477M7K00) for further investigation.

Thanks for the feedback!