You'd still have to wait for the TCP keepalive to timeout the connection before it will recover. On Ubuntu this might be a very long time, so be sure to set all the ZMQ_TCP_KEEPALIVE_* options to ensure a shorter timeout. On Sat, Jan 27, 2018, at 2:27 AM, Ravi Joshi via zeromq-dev wrote: > Hi Justin, > > I will check it using netstat. > > Meanwhile, ZMQ_TCP_KEEPALIVE seems not working. I still see that after > some time, Windows OS, where publishers are running, is showing 0 MBPS > transmission rate. After I restart subscribers in ROS on Ubuntu, > publishers start working. Please note that during this process I am > not restarting publishers at all.> > Below is the code snippet added to all subscribers- > > int tcp_keepalive = 1; > > zmq_socket.setsockopt(ZMQ_TCP_KEEPALIVE, &tcp_keepalive, > sizeof(tcp_keepalive));> > > - > Thanks > Ravi > > > On Saturday, 27 January 2018 5:36 PM, Justin Karneges > <[email protected]> wrote:> > > One thing you might do is run netstat on both sides to see if the > connections are still listed. In a dead connection scenario, netstat > should no longer list the connection on the PUB side, but should > remain listing it on the SUB side.> > Note that it can take time for the PUB connection to give up. On > Linux, the default is something like 20 minutes after it dies, so give > the PUB side some extra time after messages stop transmitting. If > transmission hasn't worked for over 20 minutes and netstat is still > showing the connection on the PUB side, then the problem may be > something else.> > On Sat, Jan 27, 2018, at 12:13 AM, Ravi Joshi via zeromq-dev wrote: >> Hi Justin, >> >> Thank you very much. How do I make sure that I am getting dead >> connections?>> >> For time being, I am enabling ZMQ_TCP_KEEPALIVE on all 3 SUB sockets.>> >> I will tell you the status of it after sometime. >> >> Thanks >> - >> Ravi >> Sent from Yahoo Mail for iPhone[1] >> >> On Saturday, January 27, 2018, 3:27 PM, Justin Karneges >> <[email protected]> wrote:>>> Hi, >>> >>> One issue with socket types that don't usually write data (such as >>> SUB) is that a dead connection might go unnoticed forever. You can >>> work around this by enabling TCP keep alives on the SUB socket. I >>> don't know if you're getting dead connections here but just thought >>> I'd mention it.>>> >>> Justin >>> >>> On Fri, Jan 26, 2018, at 9:33 PM, Ravi Joshi via zeromq-dev wrote: >>> > Hi, >>> > >>> > I am using Publisher-Subscriber pattern consisting of 3 >>> > publishers to>>> > publish 3 different types of data. All 3 publishers >>> > are written >>> > in a>>> > single C# file. However, each subscriber is written in a >>> > separate C++>>> > file inside ROS. From the point of ZeroMQ, there is no >>> > difference in>>> > each subscriber, since context, socket initialization >>> > and >>> > receiving>>> > message is done in the same way for all subscriber. Hence, >>> > in >>> > order to>>> > make the mail shorter, I am just posting code snippet of 1 >>> > subscriber below. >>> > >>> > The publisher code in C# snippet is available in Pastebin >>> > (https://pastebin.com/S65LmwuV). >>> > The subscriber code in C++ snippet is available in Pastebin >>> > (https://pastebin.com/xb3V0n0u). >>> > >>> > The publisher works well initially for some time and successfully>>> > >>> > transmits data at 700MBPS rate but stops transmitting any data >>> > after 5-6>>> > hours. >>> > >>> > In order to make publisher working again, I need to restart the >>> > subscribers. This is strange to me since it is unexpected >>> > behavior as>>> > per the Publisher-Subscriber pattern is concerned. >>> > >>> > Why such weird behavior? Any workaround, please. >>> > >>> > - >>> > Thanks >>> > Ravi >>> > _______________________________________________ >>> > zeromq-dev mailing list >>> > [email protected] >>> > https://lists.zeromq.org/mailman/listinfo/zeromq-dev >>> >>> _______________________________________________ >>> zeromq-dev mailing list >>> [email protected] >>> https://lists.zeromq.org/mailman/listinfo/zeromq-dev >>>> >> _________________________________________________ >> zeromq-dev mailing list >> [email protected] >> https://lists.zeromq.org/mailman/listinfo/zeromq-dev > > _______________________________________________ > zeromq-dev mailing list > [email protected] > https://lists.zeromq.org/mailman/listinfo/zeromq-dev > > _________________________________________________ > zeromq-dev mailing list > [email protected] > https://lists.zeromq.org/mailman/listinfo/zeromq-dev
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