Hmm, on linux, the number of file descriptors per process is limited (typically to 1024). The total limit on my machine (kernel limit is ~734 000 opened files).
This means a process can accept only 1024 connections?!? I can tweak the limit as super user of that machine; this however is no good solution. Think of my agent simulation running on a server where I'm not root. Then each process can accept only 1024 connections which is way to few... I wonder why zmq needs a file descriptor per connection... Alexander Doron Somech wrote: > I'm not sure I understand, each file descriptor is a socket. When > zeromq accept tcp socket another file descriptor is created. OS should be > able to manage thousands and tens of thousand open descriptor. > > On Jul 19, 2016 6:56 PM, "Alexander Poddey" <[email protected]> > wrote: > >> >> Essentially, the question is: >> why does ZMQ consume file descriptors at all? >> >> >> >> >> > Hi, >> > >> > I have a setup in C++ on linux where a master process is setting up a >> > ZMQ_ROUTER and then forks many child processes, which then connect to >> that >> > router (tcp protocol). >> > Whenever a child zmq_connect's to the master, a file descriptor is >> > occupied (and assigned to the master process). They get free'ed fine >> > when the connection is close. >> > >> > This however limits the number of interacting processes to the number >> > of allowed file descriptors (per process). For me (linux), this >> > currently is 1024, which is way to small for my intended use >> > (multi-agent / swarm simulation). >> > >> > Can I prevent this behaviour? >> > In my mesaging architecture, each agent connects to 6 sockets, so with >> 100 >> > agents I end up with 600 occupied file descriptors :-( >> > >> > Alexander >> > >> > >> > _______________________________________________ >> > zeromq-dev mailing list >> > [email protected] >> > http://lists.zeromq.org/mailman/listinfo/zeromq-dev >> >> >> _______________________________________________ >> zeromq-dev mailing list >> [email protected] >> http://lists.zeromq.org/mailman/listinfo/zeromq-dev _______________________________________________ zeromq-dev mailing list [email protected] http://lists.zeromq.org/mailman/listinfo/zeromq-dev
