I can't bring up the Acquire Read Region Method from the Invoke Method in my PXI-7842R project. I haven't been able to find a list of targets that have this method; is it unavailable for this card? I've built an application that transfers 800kB/sec from a PXI-7842R FPGA to the host application. On the FPGA side I take a 16 bit analog sample and 16 bits of digital samples every 5 us and combine them into a U32 --> 4 bytes every 5us for 800kB/s. The U32s are loaded to a Target-to-Host DMA FIFO that's read on the host side every 5ms. On the host side I read all the elements in the FIFO and split the elements in the array into 2 U16s to separate the analog sample from the digital values. The digital values are then converted to graphs for display. According to the profiler this acquisition block uses the most memory. The application crashes every once in a while due to out-of-memory errors; this can take a few minutes or a few hours. I'm using a PXIe-8840 controller with 4GB of RAM, and LabVIEW alone takes up about 1.2GB. I'm trying to reduce the memory footprint and came across the Acquire Read Region method, but it doesn't show up as an option when selecting a method. If I create a new VI outside of any project, open an FPGA reference to my bitfile, and connect to the Invoke Method then the Acquire Read Region option does show up. Any idea what's going on? The only other memory issue I can think of is that I am updating front panel indicators programmatically from within subVIs; I open one refererence to each indicator, leave it open throughout the program run for updates, and then close it when exiting the program. I don't think this should result in a memory leak, right?

LabVIEW

Hi,

Do you have the same version of LabVIEW and operating system?

Otherwise, the following KB article details the differences between 32 bit and 64 bit LabVIEW versions.

LabVIEW 64-Bit vs. 32-Bit Applications FAQ

David

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