Dear Charles, this page notes that the creation of the message itself is guaranteed not to cause a copy operation.
It does not, however, say anything about moving the message from one socket to the other, and about the behavior of zmq_recvmsg. (My question is thus if the zero-copy guarantee applies to the whole chain of operations.) Thank you, Wenzel > On Jan 16, 2016, at 5:20 PM, Charles Remes <[email protected]> wrote: > > Look at this man page: > > http://api.zeromq.org/3-2:zmq-msg-init-data > <http://api.zeromq.org/3-2:zmq-msg-init-data> > > Zeromq does zero copy. > > However, before you go and write a bunch of complex code, just use the normal > facilities first and benchmark it. You may not need to do this extra work. > > >> On Jan 16, 2016, at 10:13, Wenzel Jakob <[email protected] >> <mailto:[email protected]>> wrote: >> >> Hello all, >> >> I’m interested in using ZeroMQ to build a multithreaded application which >> uses INPROC transport to propagate messages between threads. >> >> My plan was to send messages using zmq_sendmsg (created using >> zmq_msg_init_data with a custom deallocator), and to receive messages, I was >> planning to use zmq_recvmsg. >> >> I’m concerned if INPROC will perform unnecessary copies of messages, which >> can be very large in my application (i.e. hundreds of megabytes). In >> principle, it should just be possible to do it without copies by just moving >> zmq_msg_t* from the inproc socket of one thread to that of the other — >> however, I am not familiar enough with the implementation of ZeroMQ to know >> if that is indeed what happens. Can anyone here advise? >> >> Thank you in advance for your help! >> >> Best regards, >> Wenzel >> _______________________________________________ >> zeromq-dev mailing list >> [email protected] <mailto:[email protected]> >> http://lists.zeromq.org/mailman/listinfo/zeromq-dev > > _______________________________________________ > zeromq-dev mailing list > [email protected] > http://lists.zeromq.org/mailman/listinfo/zeromq-dev
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