Acquire Data in Background Thread

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Randall Reynolds 2020-6-4

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https://ww2.mathworks.cn/matlabcentral/answers/542354-acquire-data-in-background-thread

评论： Randall Reynolds 2020-10-1

Hello,

I am trying to create a data acquisition script that streams picoscope data. I do not have a lot of experience with MATLAB UI development, but I have expereince in other such as Python and Java; in these applications, I would offload the background data acquisition to a background/worker/separate thread with callbacks the UI. In my MATLAB application, I need to offload some data processing to a separate thread and the save to a file. It would be fine if the data acquisition happened in the main or worker thread. I have seen some funtions such as batch (Parallel Processing Toolbox), start(Data Acquisition Toolbox) and startBackground(Data Acquisition Toolbox), but I do not have acess to these toolboxes. Does anyone know of a way to accomplish this task? Thank you.

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Walter Roberson 2020-9-30

If the needed data was from before the parfor started then parfor would normally copy the data in when it sees reference to it, but you can also be more specific with https://www.mathworks.com/help/parallel-computing/parallel.pool.constant.html which has potential performance improvements.

Data can be sent between client and worker using parallel data queues, in either pollable or nonpollable varieties https://www.mathworks.com/help/parallel-computing/parallel.pool.dataqueue.send.html

If you are using Mac or Linux then sometimes it is worth using the File Exchange contribution to do shared memory. However I suspect that has not been updated to take into account changes to representation of complex values in R2018a (I think it was) -- that changed the header representation so the changes affected even non-complex variables.

Randall Reynolds 2020-10-1