Do your different subnets violate the assumptions listed here?
http://www.open-mpi.org/faq/?category=tcp#tcp-routability
We have not implemented any workarounds to say "subnet X is routable
to subnet Y" because no one had asked for them. Such workarounds are
possible, of course, but I don't know what kind of timeframe we would
be able to implement them in. Contributions would always be
accepted! :-)
Probably the easiest workaround would be a top-level MCA parameter
that effectively tells OMPI to assume that *all* TCP addresses are
routable to each other. That might not be too difficult to implement.
On Apr 3, 2007, at 4:11 PM, Xie, Hugh wrote:
Hi,
I got the follow error message while running: 'mpirun -v -np 2
-machinefile hosts.txt testc.x'
Process 0.1.1 is unable to reach 0.1.0 for MPI communication.
If you specified the use of a BTL component, you may have
forgotten a component (such as "self") in the list of
usable components.
----------------------------------------------------------------------
--
--
----------------------------------------------------------------------
--
--
Process 0.1.0 is unable to reach 0.1.1 for MPI communication.
If you specified the use of a BTL component, you may have
forgotten a component (such as "self") in the list of
usable components.
----------------------------------------------------------------------
--
--
----------------------------------------------------------------------
--
--
It looks like MPI_INIT failed for some reason; your parallel
process is
likely to abort. There are many reasons that a parallel process can
fail during MPI_INIT; some of which are due to configuration or
environment
problems. This failure appears to be an internal failure; here's some
additional information (which may only be relevant to an Open MPI
developer):
PML add procs failed
--> Returned "Unreachable" (-12) instead of "Success" (0)
----------------------------------------------------------------------
--
--
The same commands works if the content in hosts.txt is in same subnet.
Once I switch to hosts in different subnet, it stop working. I am
using
ompi 1.2.
Please help.
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Jeff Squyres
Cisco Systems
