Cpu usage at 100%

I am running LabView 7.1 with DSC loaded. My project controls two reaction vessels through compact fieldpoint I/O modules. There are PID loops, data logging, trending and general value displays. The I/O is a mixture of analog and discrete. With trending enabled, my CPU usage jumps to 100%. This happens immediately, not slowly building over time. When this happens, the other portions of the program suffer, i.e. slower updates to PIDs and subsequently out-of-control loops, along with extremely slow updates to the screens. Disabling the trending results in the cpu usage dropping to around 3% and normal PID control and screen updates. The computer is plenty fast with enough RAM. Trending is vital to the technicians ability to manage the reaction. Has anyone seen this issue? I am using the read traces vi to populate the trends.

Sorry, I cannot test because of missing subVIs, but I would NOT place waits inside these FOR loops! They run for a limited number if iterations and do nothing special except some property nodes. Since your code is heavily sequentialized (sic ) all you do with these waits is prevent the program from doing anything useful.
What might help would be do defer panel updates during the sequence of FOR loops containing property nodes. (see e.g. http://forums.ni.com/ni/board/message?board.id=170&message.id=164135#M164135)
You have a lot of duplicate code that could be consolidated. Overall, the code is very hard to navigate because of the deep stacks of sequence structures.
Message Edited by altenbach on 10-24-2007 07:08 AM
LabVIEW Champion . Do more with less code and in less time .

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Hello Zubeyir.
Hopefully this support article is what you need:
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Hi Sharma,
Please seek help from
Scripting forum or else wait until any of our moderator move this post to concerning forum.
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Regards, Ravikumar P

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Hi and Welcome to the discussions!
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http://i207.photobucket.com/albums/bb171/mike96z/ProcessExplorer.jpg
[IMG]http://i207.photobucket.com/albums/bb171/mike96z/ProcessExplorer.jpg[/IMG]
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Solved!
Go to Solution.

Hello Prashant,
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[http://img156.imageshack.us/img156/5078/screenshotxya.png|http://img156.imageshack.us/img156/5078/screenshotxya.png]
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?????

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