Interesting. Thanks for the response. I also have a bunch of message passing going on. Do you think it could be dropped messages? I seem to remember reading that PMT ports aren't back pressured like the streaming ports. What happens when a queue fills up and the block can't catch up?
Anyway, what I would also like to know is a bit more explanation for the last message in the thread I linked to in my first email. It seems like this was a known problem with large data files and the absence of a throttle block? On Tue, Oct 2, 2018, 7:25 PM Sylvain Munaut <246...@gmail.com> wrote: > Hi, > > > Unfortunately, there were no further replies to that thread but I did > see that my same question "pops up every once in a while". Anyway, my > specific problem is I'm trying to QPSK demodulate + RS decode a 2MS/s, > 1Mbps bit rate, 10GB IQ file. This works fine, but I'm getting a different > number of successfully decoded packets every run. I am using a throttle > block, and in fact tried to reduce the throttling rate to 200KHz > (samplingrate/10), but it still doesn't seem to work. As for how much CPU > my flowgraph is utilizing, it takes up around 80% of all 8 of my CPU cores > at the regular sampling rate, while taking around 30% of my cores at > samplingrate/10. Do you guys have any idea on what might be going on? The > thread I'm referencing is from 2013, but is it still relevant? Any > technical reasons for the non-deterministic behavior? I'm using 3.7.13.2. > > Depends on your flow graph obviously, but in general, no. > > Unless for the obviously "random" blocks (like noise generators and > such), AFAIK most other blocks should have a deterministic behavior > (at least when running on the same exact GR version). Usually > undeterministic behavior points to a bug in one of the blocks that > doesn't properly deal with the boundaries in the work() call. > > cheers, > > Sylvain >
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