error "memory is full" with writing a file permanently PDM

Hello world

I know that the problem of "memory we complete" has been often discussed in this forum, and I have read these messages, but still could not solve the problem.

We have implemented a test function based on PXI5412 and 5122 modules. The program generates arbitrary waveforms to excite a DUT and acquires its response with digitizer and writing of the data acquired in a TDMS file (~ 40 MB for each measuring point). The program works fine in single point mode, i.e. in quiet passages. However, when I try to run it continuously in a loop TO measure several (up to 1,000) points, the program is always interrupted at halfway when ~ 10 GB of data is recorded with an error "memory is full".

My computer has 4 GB of RAM and the operating system is Windows XP Professional 32-bit. I checked the RAM usage when the error "memory is full" happened. in fact we at least 2.5 GB unused. I learned that maybe it's because he is not a continuous free space in RAM for data. It is also suggested to increase virtual memory to 3 GB for Labview by modifying the boot.ini file. But after I did the program meets still another error "Invalid TDMS" the file reference, and so I could not write all data to a file of PDM.

I joined the part of logging of data of my code here. Is there a another way around the problem of memory, as using the same block of memory for buffering of data between the memory of the digitizer and the hard drive?

cheney_anu,

I need to know your details of tdms files before I could provide a buffer appropriate setting.

for example,.

The current design: you write a tdms 40 GB file that contains 1000 groups (a point a group), each group contains 1,000 channels and each channel contains 1 d I16 table with 20 M of length. (Note: this 40 GB tdms file contains 1000 x 1000 = 1 M channels)

Change:, you could write 1 d I16 table instead of table I16 2D, which could reduce the number of channel 1 M 1 k, and then reduce the memory usage.

New design: you write a tdms 40 GB file that contains 1000 groups (a point a group), each group contains 1 channel and each channel contains 1 d I16 array with length 20G (for each point, call 'TDMS write' 1000 times in a "loop For ' and every time write 1 d I16 array with length 20 M). (Note: this 40 GB tdms file contains 1000 x 1 = 1 K channels)

Tags: NI Software

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