Hi Moses - And just to confirm, if you remove your LDPC block from that flowgraph or replace it with a passthrough, you don't see the leak?
Cheers, Ben On Tue, May 7, 2019 at 7:24 PM Moses Browne Mwakyanjala <mbkit...@gmail.com> wrote: > Hello Ben, > Thanks. > For LDPC, the executable can be found at > > *gr-ccsds/examples/LDPC/ldpc_2/build-ldpc_decoder-Desktop-Debug/ldpc_decoder.* > The C++ executable for Turbo code can be found at > *gr-ccsds/lib/fec/turbo/deepspace-turbo/bin/deepspace_turbo* > > I'm not very familiar with Valgrind so I monitored the memory usage by > looking at system monitor on my Ubuntu laptop. The memory usage is almost > constant, at around 17.1 Mbs for the ldpc_decoder executable. On GNU Radio, > the memory usage jumps by huge steps (100Mb) in a matter of seconds until > all the memory (the ram is around 8 gigs) is fully consumed. > > Thanks for links to the memory buffer blog post. I will have a look. > Regards, > Moses. > > On Tue, May 7, 2019 at 10:13 PM Ben Hilburn <bhilb...@gnuradio.org> wrote: > >> Hey Moses - >> >> This is really cool work! Thanks so much for sharing it. Michael's >> suggestion of pushing it was a good one. I haven't looked at the code yet, >> but: >> >> The code was able to run smoothly in a C++ application but experienced >>> memory leaks in GNU Radio. >>> >> >> I'm curious how confident you are in this? It might be worthwhile to run the >> pure-C++ version through Valgrind just to double-check, if you haven't >> already. >> >> I also have one question regarding buffering in GNU Radio. Since >>> iterative decoding with a large number of iterations and large block sizes >>> takes time to complete, the input pmt data that is not consumed immediately >>> will have to be stored somewhere. Is that the case? Could that be the >>> reason for the memory leak? >>> >> >> Things do get stored until buffers and full, and then backpressure builds >> up through the flowgraph. This shouldn't cause memory leaks. >> >> For a more thorough explanation of this, check out this excellent blog >> post from Marcus Mueller! >> >> https://www.gnuradio.org/blog/2017-01-05-buffers/ >> >> Cheers, >> Ben >> >
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