Hi Harry: Not sure if this is relevant, but we had a similar-sounding problem — check out https://github.com/zeromq/libzmq/issues/3186 <https://github.com/zeromq/libzmq/issues/3186> and see if it might be helpful.
Regards, Bill > On Nov 4, 2020, at 2:54 AM, Harry Mander via zeromq-dev > <[email protected]> wrote: > > Hi, > > I am having an unusual problem with memory usage and PUB/SUB sockets. Tested > in C with libzmq 4.3.3 on Ubuntu 18.04. > > I have a process which is bound to a PUB socket whose memory footprint (as > measured by top, htop etc.) grows as other processes subscribe to the socket > with SUB. However, the memory footprint of the PUB process does not increase > when the SUB sockets are closed. > > Publisher minimal test case, min-pub: https://pastebin.com/r85GZYcw > <https://pastebin.com/r85GZYcw> > Subscriber minimal test case, min-sub: https://pastebin.com/9cw7tNgL > <https://pastebin.com/9cw7tNgL> > > min-pub polls stdin for messages to send on `ipc://@test` socket. Memory > footprint increase can be seen on my machine by running `min-sub 100 info` > which creates 100 subscribers connected to `ipc://@test` and subscribes each > one to "info". Typing "info message" into min-pub causes messages to be > received fine in min-sub process. min-sub is closed by sending SIGINT (i.e. > Ctrl-C) before which the SUB sockets will unsubscribe from "info" and be > closed. min-pub is closed by sending EOF (i.e. Ctrl-D). > > Each time min-sub is run the resident memory footprint of min-pub as observed > in htop increases and never decreases even after min-sub exits. If min-sub is > run enough times min-pub will be terminated by the OOM killer. > > I have tested both sub and pub programs with memcheck and neither reports any > errors or memory leaks. > > Regards, > Harry > > This Communication is Confidential. We only send and receive email on the > basis of the terms set out at www.taitradio.com/email_disclaimer > <http://www.taitradio.com/email_disclaimer> > _______________________________________________ > zeromq-dev mailing list > [email protected] > https://lists.zeromq.org/mailman/listinfo/zeromq-dev
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