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Subject: Re: [OMPI users] Connection refused with openmpi-1.6.0
From: Siegmar Gross (Siegmar.Gross_at_[hidden])
Date: 2012-07-11 12:12:32


Hello Reuti,

thank you for your reply.

> > I get the following error when I try to run my programs with
> > openmpi-1.6.0.
> >
> > tyr hello_1 52 which mpiexec
> > /usr/local/openmpi-1.6_32_cc/bin/mpiexec
> > tyr hello_1 53
> >
> > tyr hello_1 51 mpiexec --host tyr,sunpc1 -np 3 hello_1_mpi
> > Process 0 of 3 running on tyr.informatik.hs-fulda.de
> > Process 2 of 3 running on tyr.informatik.hs-fulda.de
> > [[4154,1],0][../../../../../openmpi-1.6/ompi/mca/btl/tcp/btl_tcp_endpoint.c:586:m
> > ca_btl_tcp_endpoint_start_connect] from tyr.informatik.hs-fulda.de to: sunpc1
> > Unable to connect to the peer 127.0.0.1 on port 1024: Connection refused
> >
> > Process 1 of 3 running on sunpc1.informatik.hs-fulda.de
> > [[4154,1],1][../../../../../openmpi-1.6/ompi/mca/btl/tcp/btl_tcp_endpoint.c:586:m
> > ca_btl_tcp_endpoint_start_connect] from sunpc1.informatik.hs-fulda.de to: tyr
> > Unable to connect to the peer 127.0.0.1 on port 516: Connection refused
>
> Some distributions give the loopback interface also the name of the host. Is there an additonal line:
>
> 127.0.0.1 tyr.informatik.hs-fulda.de
>
> in /etc/hosts besides the localhost and interface entry?

No it isn't.

tyr etc 16 more hosts
#
# Internet host table
#
::1 localhost
127.0.0.1 localhost
...

tyr etc 20 ssh sunpc1 head /etc/hosts
127.0.0.1 localhost
...

Kind regards

Siegmar

> > [sunpc1.informatik.hs-fulda.de:24555] *** An error occurred in MPI_Barrier
> > [sunpc1.informatik.hs-fulda.de:24555] *** on communicator MPI_COMM_WORLD
> > [sunpc1.informatik.hs-fulda.de:24555] *** MPI_ERR_INTERN: internal error
> > [sunpc1.informatik.hs-fulda.de:24555] *** MPI_ERRORS_ARE_FATAL: your MPI job will
> > now abort
> > ...
> >
> >
> > I have no problems with just one host (in this case "127.0.0.1" should
> > work). Why didn't mpiexec use the ip-addresses of the hosts in the
> > above example?
> >
> >
> > tyr hello_1 53 mpiexec --host tyr -np 2 hello_1_mpi
> > Process 0 of 2 running on tyr.informatik.hs-fulda.de
> > Now 1 slave tasks are sending greetings.
> > Greetings from task 1:
> > ...
> >
> >
> > tyr hello_1 54 mpiexec --host sunpc1 -np 2 hello_1_mpi
> > Process 1 of 2 running on sunpc1.informatik.hs-fulda.de
> > Process 0 of 2 running on sunpc1.informatik.hs-fulda.de
> > Now 1 slave tasks are sending greetings.
> > Greetings from task 1:
> > ...
> >
> >
> > The problem doesn't result from the heterogeneity of the two
> > hosts because I get the same error with two Sparc-systems or
> > two PCs. I didn't have any problems with openmpi-1.2.4.
> >
> > tyr hello_1 18 mpiexec -mca btl ^udapl --host tyr,sunpc1,linpc1 \
> > -np 4 hello_1_mpi
> > Process 0 of 4 running on tyr.informatik.hs-fulda.de
> > Process 2 of 4 running on linpc1
> > Process 1 of 4 running on sunpc1.informatik.hs-fulda.de
> > Process 3 of 4 running on tyr.informatik.hs-fulda.de
> > Now 3 slave tasks are sending greetings.
> > Greetings from task 2:
> > ...
> >
> > tyr hello_1 19 which mpiexec
> > /usr/local/openmpi-1.2.4/bin/mpiexec
> >
> > Do you have any ideas why it doesn't work with openmpi-1.6.0?
> > I configured the package with
> >
> > ../openmpi-1.6/configure --prefix=/usr/local/openmpi-1.6_32_cc \
> > LDFLAGS="-m32" \
> > CC="cc" CXX="CC" F77="f77" FC="f95" \
> > CFLAGS="-m32" CXXFLAGS="-m32 -library=stlport4" FFLAGS="-m32" \
> > FCFLAGS="-m32" \
> > CPP="cpp" CXXCPP="cpp" \
> > CPPFLAGS="" CXXCPPFLAGS="" \
> > C_INCL_PATH="" C_INCLUDE_PATH="" CPLUS_INCLUDE_PATH="" \
> > OBJC_INCLUDE_PATH="" MPIHOME="" \
> > --without-udapl --without-openib \
> > --enable-mpi-f90 --with-mpi-f90-size=small \
> > --enable-heterogeneous --enable-cxx-exceptions \
> > --enable-orterun-prefix-by-default \
> > --with-threads=posix --enable-mpi-thread-multiple \
> > --enable-opal-multi-threads \
> > --with-hwloc=internal --with-ft=LAM --enable-sparse-groups \
> > |& tee log.configure.$SYSTEM_ENV.$MACHINE_ENV.32_cc
> >
> > Thank you very much for any help in advance.
> >
> >
> > Kind regards
> >
> > Siegmar
> >
> > _______________________________________________
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> > users_at_[hidden]
> > http://www.open-mpi.org/mailman/listinfo.cgi/users
>
>