Leak memory in a simple loop to save data in the table?

Hello world

I'm trying to set up a simple code to read a certain amount of data in a table at a fixed sampling rate and put these data in a local variable. I'll put this on one OR cRIO-9073 using the scanning engine and the data comes from one NOR 9208 with a speed of approximately 250 Hz scanning, even if it is not really important at the moment.

I made this little test VI which I suspect contains a memory leak, but I'm not able to identify it. The reason for my suspicion is that when I run the vi on a VMWare virtual machine (LabVIEW 2010 on Windows XP) it claims soon that it is short-term memory. Of course, the problem is perhaps elsewhere, but I hope that someone more experienced with LabVIEW programming will be able to find all the bugs very easily because it is really a piece very simpel to code. :-)

I have included a copy of the VI with a screenshot to illustrate.

Regards, Martin

PS my code looks a bit awkward, so if anyone has a better solution, I'd be very happy to learn about it!

Hello Martin,

I would try a different approach to your problem. Currently you reshape your table each iteration of the loop. This means that the allocator memory of LV must find a new piece of contiguous memory each iteration of the loop. You're probably fragment your memory and so short of contiguous blocks of memory, leading to the release of messages from memory.

For these types of tasks, I recommend having an array of fixed size that you initialize outside the loop and then use the Replace table subset in the loop for updating the values. This avoids the problem of allocating memory you use in.

Alternatively, since I assume that you use the local variable to pass data to another loop, you can use a FIFO RT to manage data. A RT FIFO resembles a queue of LV, but it is designed so that you can keep determinism in your application. Set up an acquisition loop that exports data from the 9208 every 4ms in a RT FIFO. Then set up your processing loop to run at a slower pace - say every 200ms. The processing loop reads all the elements of the FIFO until it is empty every 200ms or a number of samples. The RT FIFO is fixed size, if you need to make it large enough to contain at least 200/4 = 50 samples. For more security, you should do several times bigger, maybe 200 samples. You can try different sizes of the FIFO and also to the different periods of your processing loop to your application's specifications.

Using this method you do not have to create a counter to track items, since the reading of FIFO function can tell you how many items is in the FIFO and also when it is empty.

I recommend you the example of Communication of FIFO of RT which comes with LabVIEW to get an idea of how to use these functions.

Gerardo

Tags: NI Hardware

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01403 00000 - "no data found".
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BANNER_ID = T00001227 - PIDM = 1450 - term = 201280 - cnt = 0
INSERTION OF

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Put records = 0
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Edited by: Withnoe 6 July 2012 14:27

Put another block of start-end inside the loop (around your select statement) and includes an exception handler.
Pseudocode here:

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.
.
.
end loop;

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