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RTXI / rtxi

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maximum downsampling rate for the data recorder #53

Closed sudorook closed 9 years ago

sudorook commented 9 years ago

https://github.com/RTXI/rtxi/blob/qt4/plugins/data_recorder/data_recorder.cpp#L517

Why is the maximum downsampling rate 2?

yapatel commented 9 years ago

This is one of those “subjective” decisions…not many downsample by more than a factor of two. What rate are you aiming for/wanting?

On Mar 4, 2015, at 16:21, anselg notifications@github.com wrote:

https://github.com/RTXI/rtxi/blob/qt4/plugins/data_recorder/data_recorder.cpp#L517 https://github.com/RTXI/rtxi/blob/qt4/plugins/data_recorder/data_recorder.cpp#L517 Why is the maximum downsampling rate 2?

— Reply to this email directly or view it on GitHub https://github.com/RTXI/rtxi/issues/53.

Yogi A. Patel @yapatel525 https://twitter.com/yapatel525

sudorook commented 9 years ago

When I record the RT benchmarks module for a couple minutes at 50 kHz, the files get massive. When I plot the data with R and ggplot, their voraciousness for memory makes the issue worse, and my system starts thrashing. I want to downsample it by, say, 100-200. Enough for me to record for 30 min. to an hour without the *.h5 files becoming unmanageably large.

I suppose that 100-200 is a bad idea when collecting experimental data, but I don't think that RTXI should block it. The 1.4 version lets you downsample between 1-1000.

How about we set the max to 500?