Hello everybody,
I'm quite new to GNU Radio (and to signal processing as
well), but I did a few successful experimens. But now, I
encountered a weird behavior, namely:
Every flowgraph including Vector Source and QT GUI Time
Sink conencted (regardless if directly or with intermediate
steps) causes huge performance degradation. CPU usage jumps to
100% of a core, window takes a few seconds to refresh, GUI
becomes almost unusable.
Everything works well if I use any different source, .e.g.
Signal Source or osmocom Source.
Everything works well if I use any different sink, e.g.
Audio Sink or QT GUI Frequency Sink.
It's just this specific combination that causes the issue.
Drastically reducing the number of points in the Time Sink
helps, but at the cost of the output becoming useless.
To reproduce the problem, it's enough to do the following
in GNU Radio Companion:
1. Create an empty flow graph
2. Add "Vector Source"
3. Change "Vector" parameter to "(0, 0, 0, 1)"
4. Add "QT GUI Time Sink"
5. Connect both blocks
6. Run
Am I doing something wrong here?
(in case it's necessary, my ultimate goal here is to use
the vector source as a source of bits to modulate a square
wave; the output will later be transmitted out, but first, I'd
like to see it in the Time Sink)
I'm using GNU Radio 3.8.1.0 on Ubuntu 20.04.
Best Regards,