[zeromq-dev] triggering process_commands on inactive sockets

James Harvey jamesdillonharvey at gmail.com
Thu Aug 23 16:58:22 CEST 2018


As a side note, having some method to call process_commands while idle
would also fix the memory usage issues encountered when using ZMQ_CONFLATE
and not reading from the socket.

https://github.com/zeromq/libzmq/issues/3171

I added documentaion to periodically call getsockopt with ZMQ_EVENTS but
that still requires work on the users side.

On Thu, Aug 23, 2018 at 3:29 PM Bill Torpey <wallstprog at gmail.com> wrote:

> I’m posting this here since not everyone on the list will necessarily see
> the Github issue, and I’m interested in getting as much feedback as
> possible.
>
> The issue in question ( https://github.com/zeromq/libzmq/issues/3186 )
> has to do with finding a good way to trigger process_commands on inactive
> sockets.  In our tests, we see real-time memory utilization steadily
> increase for processes that only subscribe to data when other processes
> connect and disconnect from their publisher sockets.  The root cause of the
> problem seems to be that the publisher sockets never get a chance to clean
> up if we never call zmq_send etc.
>
> The Github issue goes into some detail on potential workarounds, along
> with their drawbacks.  I would very much appreciate any suggestions that
> the group may have on how to deal with this problem — I can’t believe that
> we’re the first to run into it.
>
> Thanks in advance for any suggestions!
>
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