https://funcptr.net/2012/09/10/zeromq---edge-triggered-notification/
On Fri, 26 Jun 2020 at 14:53, Rajiv Shukla <ra...@edgestreamlp.com> wrote: > > Hi, > > We have been grappling with a zmq issue that I was hoping might ring a bell > here on the dev list. > - We are using zmq in a python app. > - We have a receiver that opens a socket of type zmq.PAIR via > context.socket(zmq.PAIR) > - We have an epoll_wait based event loop in our app where we monitor this zmq > socket for input activity. > - The zmq socket fd is found via socket.get(zmq.FD) - The issue we are having > is that often epoll_wait sees no activity on the socket fd even though we > know a message was received. In order to investigate further, we ran strace > on the application and found that what we call is zmq socket fd is an > [eventfd] type of descriptor and a notification using this descriptor is sent > from the zmq i/o thread by writing 8 bytes to it. This triggers our own > eventloop to return from epoll_wait. From time to time, however, it appears > that the zmq i/o thread does not write to this descriptor until multiple > messages have been received which causes our own eventloop to not get > notification of data arrival in time. > > Does this ring a bell? Any idea what might be going on or how we can solve > this? I'll be happy to provide more info. > > Thanks. -- Rajiv > > The information transmitted is intended only for the person(s) or entity to > which it is addressed and may contain confidential and/or privileged > material. Any review, retransmission, dissemination or other use of, or > taking of any action in reliance upon, this information by persons or > entities other than the intended recipient is prohibited. If you received > this in error, please contact the sender and delete the material from any > computer. Email transmission cannot be guaranteed to be secure or error-free. > > This information is not intended and should not be construed as investment, > tax or legal advice or an offer or solicitation to buy or sell any security. > Any offer or solicitation for any private investment fund advised by > Edgestream Partners, L.P. or any of its affiliates may only be made by > delivery of its confidential offering documents to qualified investors. > _______________________________________________ > zeromq-dev mailing list > zeromq-dev@lists.zeromq.org > https://lists.zeromq.org/mailman/listinfo/zeromq-dev _______________________________________________ zeromq-dev mailing list zeromq-dev@lists.zeromq.org https://lists.zeromq.org/mailman/listinfo/zeromq-dev
