LabVIEW program crashes after running for few hours

Hello,
I am doing some experiments at the moment which are supposed to last for 18 hours.
Basically, I use a LabVIEW program to control a power supply through a LabJack U6 DAQ. I am currently using LabVIEW 8.5 on Windows 7.
In order to do that, I use a laptop where everything has been disabled such as power management settings, network access is off, windows updates are also off...
As far as I know, the computer can't turn into sleep mode or just shut down (I'm a 100% sure of that actually).
But last night, I started an 18 hours experiment at 5 pm, and when I came in this morning, the program shutted down by itself. Fortunately, the power supply is still providing the voltage I want, but I can't figure out why the program crashes.
When I start the experiment, it also automatically starting saving data in a spreadsheet file (I guess the size of the file should be 36 MB), so it might be a problem of memory access or something.
I really don't know what could have cause this crash, does someone have an idea?
I saw some other threads similar to my problem but I am not running an executable, I am running the front panel directly from the editing mode.

Hi,
thank all of you for your quick answers!
@Josborne : I do not have an error handling in my program. Actually you can look at my program in the attachment file. This is my first LabVIEW program so I've never dealt with error in and error out function... Moreover, what is a log file exactly?
@Johnsold : Yes, I am building an array continously growing over time. Actually, my program stops saving data when you hit the "STOP" button, it doesn't write into a spreadsheet file through a period of time, that is something I eventually need to correct.
@LabJackSupport : I can try to reduce my time step, so far it's 100 ms. I have a problem with disconnecting the USB cable from the computer though : for no reason, if I just unplug the connection between the LabJack U6 and the computer, my power supply will just go providing 157 Volts! And for my experiment, this is something we don't want to have so we just leave it as it is now. Disabling some part of the program is a good idea, I can try it
Thank you for your answers
Attachments:
Control Software.vi ‏511 KB

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127740.502: [GC [PSYoungGen: 340464K->169143K(353792K)] 2980821K->2836693K(8218112K), 0.1914048 secs]
127741.562: [GC [PSYoungGen: 353783K->166305K(345344K)] 3021333K->2860977K(8209664K), 0.1367291 secs]
127742.973: [GC [PSYoungGen: 340908K->153430K(349568K)] 3147976K->3124907K(8213888K), 0.1970560 secs]
127743.946: [GC [PSYoungGen: 328278K->156065K(349568K)] 3299755K->3277928K(8213888K), 0.1868634 secs]
127745.498: [GC [PSYoungGen: 330183K->156854K(349568K)] 3564442K->3545105K(8213888K), 0.1836370 secs]
From the log it seemed that the memory usage jumped by 150M to 250M within 1.5 second, even when the user traffic was very light (a couple of page views a second, vs. 10 page views a second at peak). The same app was running fine for many hours on a Windows dev machine in load testing condition with about 300M heapsize. No memory leakage was found so far. (it would be pretty unlikely to have such a large memory leakage without being noticed in dev and testing)
Thanks for any help.
Edited by: tuxzilla on Nov 16, 2008 11:43 PM
Edited by: tuxzilla on Nov 16, 2008 11:46 PM

A NewSize of 512m seems small for an 8G heap. This would probably cause most objects to be rapidly tenured into the OldGen heap space. (Ultimately depends on your application.) You might consider either using a NewRatio in place of NewSize/MaxNewSize or not use either and instead see how the jvm handles things itself with"-XX:+UseAdaptiveSizePolicy"
VisualVM is a good graphical tool for watching gc activity.
NewRatio=1 is the largest you can go for Eden, which will set (Eden and survivor spaces) equal to oldGen space. ie, for 8G, 4g each.
Watch activity in the gc tool, you will see "sawtooth" activity. If your sawtooth pattern does not maintain a flat profile, then you have in fact have a memory leak.

LabVIEW program crashes after running for few hours

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