Reading the TOC file time increases

Hello

Recently, I did a lot of data in tdm format. I recorded it originally in an overly complex and organized way which gave rise to the large header files and was very slow. I changed it and most of the data is fine, except 6 files in the old format. Just try to read out the data and then convert it into an easier format takes too much time. Each file has 15000 ~ groups of channels, each with 3 channels (I won't do this again...). I have witten a little vi to test the playback speed. Other than opening and closing of the record, if I found a group of channels by name, reading a channel of this group takes about 1 second. It could still take days to read all, but it would be acceptable. The strange thing is, it is that if I do this in a loop for successive channel groups which is clearly necessary, it takes more time and more time each iteration. This is behavior I've always seen during playback of the files in the TOC, but it did not cause a serious problem before. I can't find information on why, so I hope I'm just something stupid. I have attached the speed stable vi (Labview 2010). It runs for 5 iterations, the time for read channels

0.82304 s

1.58809 s

2.42514 s

3.56820 s

5.60632 s

The channels, it's reading all have the same number of values, and it makes no difference if I put myself in a group of different channels (by adding a number to i in the loop).

Does anyone have an explanation for this behavior?

Thank you very much for your help, and I'm sorry if it's something tht was asked before.

James

Hello again,

Have another look at your code, I think I have a few suggestions as well.

Try to change the replacement options in open data vi to open (read only).

Also, I found a moment of someone else having this problem. Their solution was to use the "convert to the TDM to TDMS VI" in the range of storage to convert files TDM PDM and then by performing read operations. Could this work for you?

Best regards

Tags: NI Software

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