I get the following error when trying to the run gr-perf-monitorx against a flow graph that has an RTL_SDR radio as the source. I recompiled both rtl_sdr and gr_osmosdr after enabling performance counters in gnuradio.
The odd thing is that it works fine when I do not have an RTL_SDR radio attached. In that instance gr-osmosdr simply attaches a null source instead. This seems to point to the RTL_SDR source. Has anyone succesfully used gr-perf-monitorx with a RTL_SDR source?
Thanks
Luke
PS - also just in case anyone else tries, 'perf top' doesn't work in a VM...