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Subject: [OMPI users] Connection refused with openmpi-1.6.0
From: Siegmar Gross (Siegmar.Gross_at_[hidden])
Date: 2012-07-11 10:59:40


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

[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