PXI-SCXI in Linux running LV 8.0.1 consuming all available memory

Question

Hi, we have the following environment here:
Software
- Mandriva 2006 PowerPack
- LabView 8.0 with update 8.0.1 for Linux
- DAQmx 8.0
- DAQmx base 2.0
Hardware
CHASSIS  PXI-1011: PXI-8176, 512Mb RAM, 6052e, SCXI-1129 (we are using 7 of them), BORNES SCXI 1129: 1335,  matrix topology 8x32
 LV program
Two analogic acquisition tasks created and cleared in a non-simultaneous way (one for rotation measurements, and the other for vibration measurements), and a switching task, in a total of 54 sensors.
Here goes the history:
After struggling (togheter with some NI folks) to configure this environment in Linux, now we have a different problem: In a matter of days our application eats all the available memory (swap and RAM) and freezes the PXI-SCXI.
We have already checked:
- (phisical) memories
- all start-clear/stop threads (including different combinations of stop AND clear and only clear)
- isolated our algorithm;
- isolated all local variables and arrays (no global variables);
- isolated all database related code.
In the end, after having only the acquisition tasks running, the LV process still eating aproximatelly 1Mb of RAM per minute, if we use a 1minute window for complete switch-loop and acquisition-loop.
We would like to know if there is some known workaround or upgrade that we are supposed to do to solve this problem.
Thanks in advance for all contributions,
Message Edited by ratem on 08-09-2007 05:34 PM

Answer 1

Hi Ratem,
Memory leaks is a little difficult to debug. I can see you have already done some procedures to isolate the problem. The tests indicate that the acquisition code is consuming the memory. It is possible if you are leaving some tasks open (in memory). All tasks opened must be closed to deallocate the reserved memory.
There are others possibilities to the memory problem. The linux itself can be the problem. Are you sure the memory leaks are only observed when the LV program runs? If it's the case, I will suggest you to do a simple vi, a while loop with a timing function. Does this simple program show the same behavior?
Best Regards,
Alisson Kokot
NI BRAZIL