Hi Sangamesh,

  I think the problem is that you're loading a different version of OpenMPI at runtime:

[master:17781] [ 1] /usr/lib64/openmpi/libmpi.so.0 [0x34b19544b8]

  .. The path there is to '/usr/lib64/openmpi', which is probably a system-installed GCC version.  You want to use your version in:

 /opt/openmpi_intel/1.2.8/

  You probably just need to re-set your LD_LIBRARY_PATH environment variable to reflect this new path, such as:

(for bash)
export LD_LIBRARY_PATH=/opt/openmpi_intel/1.2.8/lib:${LD_LIBRARY_PATH}

  ... By doing this, it should find the proper library files (assuming that's the directory they're in - check your instal!).  You may also wish to remove the old version of OpenMPI that came with the system - a yum 'list' command should show you the package, and then just remove it.  The 'feupdateenv' thing is more of a red herring, I think... this happens (I think!) because the system uses a Linux version of the library instead of an Intel one.  You can add the flag '-shared-intel' to your compile flags or command line and that should get rid of that, if it bugs you.  Someone else can, I'm sure, explain in far more detail what the issue there is.

  Hope that helps.. if not, post the output of 'ldd hellompi' here, as well as an 'ls /opt/openmpi_intel/1.2.8/'

  Cheers!
  - Brian



On Sun, Dec 7, 2008 at 9:50 AM, Sangamesh B <forum.san@gmail.com> wrote:
Hello all,

Installed Open MPI 1.2.8 with Intel C++compilers on Cent OS 4.5 based
Rocks 4.3 linux cluster (& Voltaire infiniband). Installation was
smooth.

The following error occurred during compilation:

# mpicc hellompi.c -o hellompi
/opt/intel/cce/10.1.018/lib/libimf.so: warning: warning: feupdateenv
is not implemented and will always fail

It produced the executable. But during execution it failed with
Segmentation fault:

 # which mpirun
/opt/openmpi_intel/1.2.8/bin/mpirun
# mpirun -np 2 ./hellompi
./hellompi: Symbol `ompi_mpi_comm_world' has different size in shared
object, consider re-linking
./hellompi: Symbol `ompi_mpi_comm_world' has different size in shared
object, consider re-linking
[master:17781] *** Process received signal ***
[master:17781] Signal: Segmentation fault (11)
[master:17781] Signal code: Address not mapped (1)
[master:17781] Failing at address: 0x10
[master:17781] [ 0] /lib64/tls/libpthread.so.0 [0x34b150c4f0]
[master:17781] [ 1] /usr/lib64/openmpi/libmpi.so.0 [0x34b19544b8]
[master:17781] [ 2]
/usr/lib64/openmpi/libmpi.so.0(ompi_proc_init+0x14d) [0x34b1954cfd]
[master:17781] [ 3] /usr/lib64/openmpi/libmpi.so.0(ompi_mpi_init+0xba)
[0x34b19567da]
[master:17781] [ 4] /usr/lib64/openmpi/libmpi.so.0(MPI_Init+0x94) [0x34b1977ab4]
[master:17781] [ 5] ./hellompi(main+0x44) [0x401c0c]
[master:17781] [ 6] /lib64/tls/libc.so.6(__libc_start_main+0xdb) [0x34b0e1c3fb]
[master:17781] [ 7] ./hellompi [0x401b3a]
[master:17781] *** End of error message ***
[master:17778] [0,0,0]-[0,1,1] mca_oob_tcp_msg_recv: readv failed:
Connection reset by peer (104)
mpirun noticed that job rank 0 with PID 17781 on node master exited on
signal 11 (Segmentation fault).
1 additional process aborted (not shown)

But this is not the case, during non-mpi c code compilation or execution.

# icc sample.c -o sample
# ./sample

Compiler is working
#

What might be the reason for this & how it can be resolved?

Thanks,
Sangamesh
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