DDC_AppendDataValueFloat takes longer with each use

I hope this is the right place to ask this question...

I use the DLL in third-party tools (Tools) to write several hundred points given to several hundred channels every 10 seconds. Each writing successive (DDC_AppendDataValueFloat) takes more time. This continues until the time it takes to write these data exceeds 10 seconds, used to collect the next batch of data. At this point, he began to get carried away. In fact, long before that, the computer is unusable.

This should take no more than 200 ms - less if possible. Initially, the times are on the order of 150 ms.

I have isolated and timed the call I do to this interface and can come to no other conclusion that: that's how long it takes to write the data. It's as if she must get the end of each channel to add new data. Surely, I'm wrong. Any help out there? Should I give more details?

Hi chasadams,

The SDC library is not continuous to the disk.  If you ask to be added at the end of a TOC file, it will be first to load the current content of the TDM file in memory, adding memory, and then save the content expanded to a new file with the same name as the original of the TDM.  If you ask the library to the SDC to add at the end of a PDM file, the same process occurs.

This is the reason why NEITHER created the TDMS API (TDM streaming), but that only ships with the products OR (LabVIEW, CVI, MeasurementStudio).

You can alternatively continuously to the binaries and the TOC header writer DLL allows you to create a corresponding header TDM to your binary data files file.  It is also a free DLL that you can download from the web site of NOR.

Brad Turpin

Tiara Product Support Engineer

National Instruments

Tags: NI Software

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