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Subject: Re: [OMPI users] Connection refused with openmpi-1.6.0
From: Reuti (reuti_at_[hidden])
Date: 2012-07-11 11:11:22


Hi,

Am 11.07.2012 um 16:59 schrieb Siegmar Gross:

> Hello,
>
> 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?

-- Reuti

> [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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