USB6356 read.vi daqmx takes too much memory

I use 6356 USB data acquisition, when I took the data, the DAQmx memory of PC more read.vi. To certain extent, show "there not enough memory to complete.  I put 2 ms/channel and frequency Hz 1 M, I know he is very big. But then daat 6 - 7 times without problem. My PC has 3 G of memory.

It seems that DAQmx read to store more data in the buffer. I have set my vi here, please check what mistake I did here or how to improve it.

Thanks Liming

Hi detech,.

DAQmx read takes 16 MB of memory because it allocates a buffer to return the data you request. You use the type of waveform data and ask for 2 million samples. Each element in the waveform data type is a point value double floating precision, which each take 8 bytes to store. So the 16 MB you see used is (8 bytes per sample) x (2 million samples).

To get samples of 2 M, you will need to use this amount of memory, and it is not a simple way around this. However, the problem you are having is that whenever the loop runs, you need additional continuous data for the chart of waveform, which is distinct from the memory used by DAQmx, because the waveform table keeps a history of 16 MB.

If you pass in a waveform curve, or simply the result of your FFT graph, I suspect that your problems will be solved, you will use only 16 MB (more the overhead of DAQmx and LabVIEW) at some point.

William Earle
National Instruments R & D | Staff software engineer | Data acquisition software

Tags: NI Software

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