TDMS Buffer

[Karissap]

Can anyone give me an example of how to use the buffer property of TDMS files? I have tried setting NI_MinimumBufferSize to a value like 1000 using TDMS Set Properties.vi but it doesn't seem to be working. If you use the buffer do you have to leave the file open in between writes and not use close. Also, how does the write buffer affect reading the TDMS data?

[Ton Plomp]

QUOTE(Karissap @ Nov 8 2007, 02:38 AM)

Can anyone give me an example of how to use the buffer property of TDMS files? I have tried setting NI_MinimumBufferSize to a value like 1000 using TDMS Set Properties.vi but it doesn't seem to be working. If you use the buffer do you have to leave the file open in between writes and not use close. Also, how does the write buffer affect reading the TDMS data?

You have to keep the reference open.

The buffer size will determine how often data is written to disk while streaming. A high number will lower the disc activity but a power failure will throw away more items.

With a low number your TDMS file needs more defragmentation afterwards.

On closing the TDMS file the whole buffer will be written to disc

Ton

[Karissap]

QUOTE(tcplomp @ Nov 8 2007, 06:52 PM)

You have to keep the reference open.

The buffer size will determine how often data is written to disk while streaming. A high number will lower the disc activity but a power failure will throw away more items.

With a low number your TDMS file needs more defragmentation afterwards.

On closing the TDMS file the whole buffer will be written to disc

Ton

Thanks, it's working great now. I also had the problem that it wasn't working in 8.20. I had to save the whole project to 8.5.