UDP/Lakes memory leaks?

I wonder if anyone has had problems with memory leaks/Lakes when you use UDP and data queues?

The program has a section of code where the queues are loaded with the data read from different UDP ports. The queues are then read by a loop (which is triggered by a source of synchronization of 1 kHz) and some of the data is displayed on the Panel before the main VI. When the program runs it loses memory about 100 Kbps leading to a failure in about 4-5 hours, when the physical RAM is at its maximum.

I think that I traced the question (using the DETT it shows several memory allocation operations) to the Subvi I join which fills the queues. Can anyone help to emphasize something that could lead to leaks of memory/Lakes?

Thank you!


I suspect that the problem is that you are not emptying queues quickly enough. And is not in the code you have posted. There's also a few subVIs, classes, and controls.

Usually call loops should only be used on real-time operating systems. They offer no advantage over the standard while loop and have an additional charge when using a desktop OS. Also placing indicators within the quick loops can create problems. The operating system does not update the screen dozens of times per second, so wrote indicators 1000 times per second LV forces or the operating system, or both to manipulate data.

Having multiple synchronization methods in a loop can lead to problems.  UDP timeout is probably based on the clock count of ticks. If you have the timeout of read of the UPD defined with a value greater than zero, the UDP bed may take longer than the timed loop interval.  The timeout of read UDP allows a wait in a standard while loop.


Tags: NI Software

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    But basically calling a DLL LabVIEW from no LabVIEW code and using LabVIEW handles string or array as parameters is several times more trouble that it's worth. The easiest would be fair, allocate a large enough buffer beforehand and pass those to the Configuration of the service DLL LabVIEW function to not accept a handful of string LabVIEW but a pointer to a string C instead. Do you work around the problem on the memory allocated by someone else to worry about your own program of VB and duty he properly release. The disadvantage of this approach is, that you should make sure that the memory allocated buffer is large enough for the maximum possible length that your DLL function may never return.

    But another approach might be to leave out LabVIEW total here and call the DAQmx APIs directly from VB.

  • TDMS write memory leak

    I use TDMS to store test data that seems to be causing a memory leak in my (very convincingly) program. Below is a graph of the three versions of my program. Series 1 uses storing data open PDM, the data file added and closed every 5 seconds. Series 2 uses storing data PDM with a referense remaining open during operation and closed at the end 3 series written data in a CSV file. The charts show the use of LabVIEW memory each seconde.5 ~ 4 hours of a 10 hour test.

    LabVIEW 8.6.1

    Windows XP SP3

    Further explanations... when a TDMS file is opened, LabVIEW will create an index in memory structure that is used for random access to the file. The Streaming API integrated LabVIEW TDM will always create the index, even if you just write. The size of the index is not dependent on the size of the file, but on how fragmented file is. If you store a relatively small number of large blocks of data, the index will be very low. If you keep adding small amounts of data on your record, it could make big enough. A cure for this is the property of NI_MinimumBufferSize. You can set this property on a channel to the LabVIEW to a number of values of the buffer before storing. In this way, data from multiple calls to 'Write TDMS' counts as a data segment in the file. Typical values for this are 1000 or 10000. Fragmentation of files and memory footprint are reduced accordingly, but LabVIEW uses little memory for buffers.

    If all else fails and you do not have access to the file of reading while you write, you can also use the VI-based TDMS API. This will not build the structure of the index that I mentioned above, so there should be no increase in memory at all. In this case, I recommend to defragment files front of post-processing.

    Hope that helps,


  • Memory leak flow network with cluster of berries

    I use the network stream in sbRIO application, and I see a memory leak when endpoint RT is connected Windows endpoint. This happens with endpoints of chain and cluster tables parameters. I've attached an example that shows the behavior.

    I found this KB, which seems to explain the problem, but the solution it offers is just to spend on scalar types: http://digital.ni.com/public.nsf/allkb/784CB8093AE30551862579AB0050C429

    I can't do it in my application; I need scalar data with a block of channels multiple samples and send the package everything together (as seen in the typedef that I included with the attached example). How can I handle this without creating a memory leak which will eventually cripple my application?

    Never mind. Definition of the size of the buffer to a lower value, got flight' to stop. I had it so great that the buffer allocated is still all the time that I was monitoring the application. When I changed to 50 elements, he has only spent a few seconds allowance, then stopped the "leak".

  • Windows Media Player ActiveX control causes memory leak

    I'm writing an application that will load and play *.avi files in an ActiveX control. The user must be able to load multiple files consecutively in the single player mode. However, it seems to be the memory leak every time that a file is loaded, even if it's the same file. For example, even when you load a small file in *.avi 81KO repeatedly, there is a memory leak ~ 6Mo coherent (as observed in the Manager of tasks). The leak memory is greater when I load larger files.

    I tried to deny it by adding using a Method Close by using the node invoke. It gets about 3 MB of RAM, but when I load the file again, it leaks ~ 9MB, leaving a net leak of ~ 6Mo once again.

    I also used reference close vi (s) to clear the memory ActiveX object, but that did not help either. In other versions of VI, I tried to eliminate the creation of a new IWMPlayer4 object using a shift register, but once again the leak memory persevered...

    It's a simple version of the VI, as well as the small video file attached. In my application, I want to be able to load large video files (~ 600 MB) several times without memory leaks. Thank you in advance for your help!


    Hi jareds.

    Thanks again for test it for me. I use Windows 7 and WMP version 12.

    As you requested, I tested it on a computer with Windows XP and WMP version 9 (and LabVIEW 8.2.1) and the problem of memory has disappeared. I then installed WMP version 11 on the same computer: still no memory problem.

    On the Windows 7 computer, I went back to version 11 using the instructions found on this link, and the problem of memory has disappeared. It seems that memory leak is due to a problem with WMP version 12 (although degraded version 11 on windows 7 has some bugs - and you can't go back to v12).

    Thanks again for the help!


  • Windows 2008 R2 64 bit servers with UAG memory leak

    We organize two Windows 2008 R2 64 bit with UAG servers.  We note that, during 10-14 days memory begins to run upstairs and users no longer able to connect to OWA through UAG.  We found KB971265 which talks about the memory leak known issues and provides a fix for Vista.  However, we do not find a similar fix for Windows 2008 R2 64 bit.  Does anyone have a suggestion?

    Hello JimBrighter,

    Thanks for visiting the site of the community responses to Microsoft Windows. The question you posted corresponds to the Windows 2008 R2 servers and would be better suited to the TechNet ITPRO community.

    Please visit the link below to find a community that will provide the support you want.

    They will be able to solve your problem.



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