So I have some more info on this: My application had a hierarchical block, inside which I had a block (called "chopper") that was setting the set_output_multiple. This block was the source of the warning:
gr::log :WARN: flat_flowgraph - Block (chopper0) max output buffer set to 6656 instead of requested 8192 I don't know why this warning was given (I suspect the size of the output buffer is forced to be a multiple of the set_output_multiple and less than 8192?), but when I reprogrammed the "chopper" block and removed the set_output_multiple from it, neither do I get the warning nor does the application crash (when i run it with controlport on). So i have solved the problem but i have not understood why it crashed in the first place. This may indicate some hidden bug in the code... So the questions are the following: 1) why is it that the flat_flowgraph gives this warning when trying to flatten a hierarchical block which contains a block with a set_output_multiple ? 2) why is it that with this choice of output buffer the application crashes when controlport is activated? best, Achilleas
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