Hi Iwase,
I ran your script and that one works.
We will try to change our code to have something similar, but that is more
difficult since we have a more extensive code base with a pub - sub
communication model.
Thank you very much for your help, if needed I ll contact you again.
Kind regards,
Tom
2017-06-09 2:08 GMT+02:00 Iwase Yusuke <iwase.yusu...@gmail.com>:
> Hi Tom,
>
> I used the attached script (Ryu App) to test "eventlet.green.zmg".
> Please note that you need to install ZeroMQ before running it.
> e.g.)
> $ pip install pyzmq
>
> Could you try this app first?
> e.g.)
> $ ryu-manager test_zeromq.py
>
> Thanks,
> Iwase
>
>
> On 2017年06月08日 21:42, Tom De Schepper wrote:
> > Hi Iwase,
> >
> > Thanks for you fast reply.
> >
> > We didn't tried out "eventlet.green.zmq" upfront, but for now we are not
> able to get it working.
> > Do you have a basic example that successfully uses the
> "eventlet.green.zmg'?
> >
> > Besides the "eventlet.green.zmq" suggestion, do you happen to have any
> other good direction that we might be able to apply?
> >
> > Best regards,
> > Tom
> >
> > 2017-06-07 3:43 GMT+02:00 Iwase Yusuke <iwase.yusu...@gmail.com <mailto:
> iwase.yusu...@gmail.com>>:
> >
> > Hi Tom,
> >
> >
> > On 2017年06月06日 20:54, Tom De Schepper wrote:
> > > Hi all,
> > >
> > > Some colleagues and I are interested in using the Ryu controller
> together with a program of our own to control and monitor network
> components. To this extend, it is necessary to set up some form of
> communication between the programs. For that, we want to use the ZeroMQ
> framework (http://zguide.zeromq.org/page:all <http://zguide.zeromq.org/
> page:all>) that allows you to set up sockets between different components
> and handles the sending and receiving of messages. The idea is to make our
> own app at the Ryu side that listens and transmits messages to ZMQ and
> handles interaction with virtual switches in the network. However, we ran
> into issues when implementing the communication part in our Ryu app.
> > >
> > > We managed to made the app transmit messages by spawning a new hub
> with a function that contains a while loop and every second will transmit
> something. This works fine. However, the other way around won’t work. Upon
> initialization of the ZeroMQ communication elements (in the constructor of
> our app) all functionality blocks. In other words, opening the
> communication socket causes blocking of all other hubs/processes within
> Ryu. We have tried, without success, solving this in different manners, by
> using different communication models (e.g., pub-sub), threads, the Ryu hub
> class, the multiprocessing framework of Python, etc. .
> > >
> > > We have no idea what causes this blocking behavior and were
> wondering if somebody within the community would have an idea. We checked
> out the implementation of the Ryu hub class and noticed that it uses
> underneath eventlets/greenlets, but are not sure if the interaction with
> that might cause the problem.
> >
> > As you said, this problem seems to be caused by the compatibility
> between ZeroMQ and eventlet.
> > GreenThread of eventlet is unexpectedly blocked if the native thread
> on which GreenThread working.
> >
> > Fist, have you tried "eventlet.green.zmq"?
> > This module provides "greenthread aware version of pyzmq".
> > http://eventlet.net/doc/modules/zmq.html <http://eventlet.net/doc/
> modules/zmq.html>
> >
> > If it does not work well, you need to spawn the native thread for
> ZeroMQ socket, I guess,
> > but it might be difficult...
> >
> > Thanks,
> > Iwase
> >
> >
> > >
> > > We would appreciate any comments or feedback.
> > >
> > > Thanks in advance and best regards!
> > > Tom
> > >
> > >
> > >
> > > ------------------------------------------------------------
> ------------------
> > > Check out the vibrant tech community on one of the world's most
> > > engaging tech sites, Slashdot.org! http://sdm.link/slashdot
> > >
> > >
> > >
> > > _______________________________________________
> > > Ryu-devel mailing list
> > > Ryu-devel@lists.sourceforge.net <mailto:Ryu-devel@lists.
> sourceforge.net>
> > > https://lists.sourceforge.net/lists/listinfo/ryu-devel <
> https://lists.sourceforge.net/lists/listinfo/ryu-devel>
> > >
> >
> >
>
------------------------------------------------------------------------------
Check out the vibrant tech community on one of the world's most
engaging tech sites, Slashdot.org! http://sdm.link/slashdot
_______________________________________________
Ryu-devel mailing list
Ryu-devel@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/ryu-devel
