As I indicated in the ticket, these are sometimes useful for identifying issues with the internals of the MPI stack. I'll go with 2, but having them by default in the tcp_exclude list.
George. On Thu, May 21, 2015 at 10:28 AM, Ralph Castain <r...@open-mpi.org> wrote: > I can’t speak for the BTL, but the OOB has no need for link-local addresses > > > On May 21, 2015, at 1:24 AM, Gilles Gouaillardet <gil...@rist.or.jp> > wrote: > > > > Folks, > > > > this RFC is a follow-up of > > * issue 585 https://github.com/open-mpi/ompi/issues/585 > > * related PR 591 https://github.com/open-mpi/ompi/pull/591 > > > > As some of you might have already noticed, Open MPI fails if configure'd > with --enable-ipv6 and ipv6 interfaces are found on the system. > > > > The root cause is IPv6 link-local addresses are not (yet) correctly > handled. > > > > Wikipedia has a good pages about link-locak addresses at > http://en.wikipedia.org/wiki/Link-local_address > > > > basically, in IPv4, link-local addresses are 169.254.0.0/16 and should > be used only when zeroconf'ing the IP stack. > > on the other hand, IPv6 are fe80::/10, are also used when zeroconf'ing, > but must always be present, in addition of a non link-local address. > > > > Currently, these addresses are considered as regular addresses, but the > tcp btl (and probably oob tcp too) do not know how to handle them, and that > causes OpenMPI crash. > > > > I can think of three options : > > 1) it is very unlikely a user wants Open MPI use a link-local address, > so link-local addresses should be simply skipped > > 2) each module should decide if/how to handle link-local addresses > > 3) all modules should correctly handle link-local addresses (that > requires some extra devel) > > > > as far as i am concerned, i am fine with 1) because i think it is very > unlikely an user ever wants to use link-local addresses. > > > > Thanks in advance for your feedback so we can move forward. > > > > Cheers, > > > > Gilles > > > > > > _______________________________________________ > > devel mailing list > > de...@open-mpi.org > > Subscription: http://www.open-mpi.org/mailman/listinfo.cgi/devel > > Link to this post: > http://www.open-mpi.org/community/lists/devel/2015/05/17442.php > > _______________________________________________ > devel mailing list > de...@open-mpi.org > Subscription: http://www.open-mpi.org/mailman/listinfo.cgi/devel > Link to this post: > http://www.open-mpi.org/community/lists/devel/2015/05/17443.php
