Problem of memory TDMS on cRIO-9035 (Linux RT)

Hello

I was unable to move in a kind of memory problem that I am experiencing during written TDMS. I write in the PDM file, use of the RAM on my RT goal grows regularly. I thought it was due to some kind of indexing that happens with very large TDMS files so I am currently split my files at the level of the 50 MB mark. When the maximum size is reached I empty and close the file, and start a new one. So when I stop recording I rinse and close the bottle. However, use of the RAM of my continuing to increase anything.

I've read about it and I've seen repeated references by using the NI_MinimumBufferSize property as a possible solution. I've implemented this, but it doesn't seem to do the trick either.

Everyone has been able to overcome this problem, or I'll have to return to the spreadsheet of construction VI (please no.).

I've included a simple set of VI that initializes an array of 16 x 2500 to simulate values 2500 for 16 channels and writes this table to classify every 50ms. In my real application table 16 x 2500 are 16 channels playback at 50 kHz readings of my analog input module. The "RT_TDMSMemoryIssue.vi" would be the main VI launch.

Thank you

Corey

It's probably the file system buffering of i/o to files in memory. Depending on your version of LabVIEW, LinuxRT reports of memory can include these as "used" memory buffers when they are actually available to applications on request.

There is a document which deals with it here: http://digital.ni.com/public.nsf/allkb/AC6200D19D23C61586257C8D006E6DC2?OpenDocument

My main question is do you ever see a memory error output? What happpens if you expect that the memory fills up?

I expect that you will see the behavior where the memory appears to fill, but any work properly!

Tags: NI Software

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