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Showing results for tags 'memory'.
Found 12 results
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Hello! It was found that the function Request Deallocation does not free memory after using an array of strings (or any other multi-dimensional array). Description of the experiment: There is a VI from which subVI is called by command. In the subVI only one-dimensional array (numbers or strings) gen...
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Can anyone please tell what a DVR [ Data value reference ] is ? I want to know at what situation it will be used and what are the advantages we get by using DVR. I am really confused in this topic . If someone has any code in which they have worked with DVRs. kindly share it to me. Thank...
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Thought I'd pass this along and see if anyone can reproduce with different versions of LabVIEW. Appreciate it if anyone has seen this and has a fix. I'm using shared variables to communicate between applications (1:N). I'd been seeing some memory creep that was inconsistent and somewhat bizarre...
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Hi, I've decided to take the temperature on a known issue, that lvclass files retain knowledge of some of their old content after it's deleted. Proof For some reason I'm not allowed to upload lvclass files, so I'll describe it instead (using LV2014SP1): 1) Create a new class and save it...
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Hi We have an application where we need to have a custom PCIe board transfer data to the PC using DMA. We are able to get this to work using NI-VISA Driver Wizard for PXI/PCI board. The recommended approach is to have VISA allocate memory on the host (PC) and have the PCIe board write...
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Hello, I've been using Snap7 library for a while in the client role, so I can communicate with SIEMENS PLCs There is specific LabVIEW info here: http://snap7.sourceforge.net/labview.html I can successfully use the Cli VIs to read/write from PLCs DBs (a DB is just a memory block). For reading I...
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Hello, I have lately run into a problem of insufficient memory. Basicallly the controller is ever running and i generate data and store it in .tdms file every x sec. and every shift (3 shifts in a day) i ftp the file to the host and delete the file. During accumalation of the data the ram conti...
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[cross posted to forums.ni.com] Greetings LVOOP masters. I realise this is not a simple question but I would really appreciate your opinion please. I'm trying to make some data handling improvements to a test sequencer application that I've written. User defined tables determine how much dat...
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Cross posted from : http://forums.ni.com...ht/true#M702675 Hi I have a memory leak on my application. By observing with the "Desktop Execution Trace Toolkit", the Power Spectrum function (from NI_AALPro.lvlib) seems to have two "Reference leak". The first one refers to the function "Open VI refe...
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I am having an issue with memory when reading a TDMS files and converting to an array to write to a spreadsheet file. If I look in task manager when I run the VI the first time it allocates a bunch of memory and only a small fraction of that memory is freed after the VI is run. Even closing the VI a...
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I need to provide a customer with a dll library with function prototypes that exactly match a provided .c header file. I would like to use LabVIEW if at all possible, as fast turnaround on source code modificaiton may be required. LabVIEW cannot export a function with a char* return type (verified b... -
Hello, I've been using the feature of Variant Attributes to store and lookup values in an efficient way. In particular, I've been storing complex objects such as the (simplified) example below where I post messages to "Observers" of those messages. My question is: is this the most efficient way...
