Maximum number of TDMS files

[MagAnd]

Hi

What is the maximum number of TDMS files LabView can have open at the same time?

[crossrulz]

In theory, 2^32.  In reality, you will likely be limited by memory first.  What exactly are you trying to do?

[MagAnd]

I have a system that opens a lot of TDMS files to store data in. I ran into problem when I reached just below 500 open files. I just created the files, did not start to stream data to them yet.

The error message I got was Error 2 "Memory is full", which is in line with your suspicion.

However, I closed all programs I could on my computer to get extra memory available, but I could not open more files anyway. This why I thought there might be a maximum number of TDMS files that LabView could handle at the same time.

[crossrulz]

Why do you need that many TDMS files?  Couldn't you just put all of the data into 1 file using different groups for the different types of data (ie a group for each file you currenty have)?

[Jacobson-ni]

Are you using 32-bit LabVIEW? If that is the case, closing out all other applications may not let you open up more files because you are already maxed out on memory.

When you run your application I would use Performance Monitor or Task Manager to view how much memory LabVIEW is using. I tried this on my computer and could only open up references to 331 empty tdms files which caused a significant amoutn of memory growth.  The VIs I used for testing just opened up references to empty TDMS files and from what I could tell there was some pretty significant overhead with just opening the file up so Crossrulz's suggestion is probably the best. Along similar lines you could also open a TDMS reference, read the data and then just close the reference out if  you already have the TDMS files written or don't want to change that code.

[MagAnd]

OK, thank you so much for the feedback.

Regards

Magnus

[Hooovahh]

Thanks are given with kudos, and marking solutions when appropriate.

https://decibel.ni.com/content/docs/DOC-40451