[zeromq-dev] Is there a non-blocking alternative to Poller.poll() ?

David Jelenc david.jelenc at fri.uni-lj.si
Tue May 4 15:06:16 CEST 2021

Hi Matthieu,

yes there is. You can use AsyncIO, Tornado's IOLoop or gevent 
library. You can find more information here:


Matthieu Robert <matthieu.robert at irisa.fr> writes:

> Hi ,
> I picked up a Python project linking 3 components together using 
> zeromq messages.
> Basically there is a Client sending and receiving message 
> to/from an Orchestrator which also sends and receives messages 
> to/from a Server.
> The in-between component, the orchestrator, has a zmq.Poller 
> object to which the server and client sockets are connected.
> To read the messages received on this Poller, I am using a while 
> loop which basically does :
> while(True) :
> events = dict(Poller.poll(1))
> #treat events ...
> Previously the Poller.poll timeout parameter was set to 100 
> milliseconds but it was slowing down my program, afterwards I 
> set the timeout to 1 millisecond and it significantly 
> accelerated my program, but I still want to reduce its CPU usage 
> by replacing all busy-waiting parts of my program (for example 
> the while loop to request the Poller.poll(1)). And I don't want 
> to use Poller.poll() without timeout because it blocks the 
> program. I though of calling Poller.poll() in a thread in 
> background, that would trigger the functions treating the events 
> while my main orchestrator program was still doing its thing.
> I was wondering if there was a non-blocking way, using zeromq, 
> to be notified when the Poller receives a new event ? Instead of 
> using a while loop to call Poller.poll(1) multiple times.
> Thank you,
> Matthieu Robert
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