gentoo@gentoo ~ $ mpirun -np 4 mdrun_mpi
[gentoo:17897] [[44045,1],1]-[[44045,0],0] oob-tcp: Communication retries exceeded.  Can not communicate with peer
[gentoo:17897] [[44045,1],1] ORTE_ERROR_LOG: Unreachable in file base/routed_base_register_sync.c at line 86
[gentoo:17897] [[44045,1],1] ORTE_ERROR_LOG: Unreachable in file routed_binomial.c at line 876
[gentoo:17897] [[44045,1],1] ORTE_ERROR_LOG: Unreachable in file base/ess_base_std_app.c at line 151
[gentoo:17898] [[44045,1],2]-[[44045,0],0] oob-tcp: Communication retries exceeded.  Can not communicate with peer
[gentoo:17898] [[44045,1],2] ORTE_ERROR_LOG: Unreachable in file base/routed_base_register_sync.c at line 86
[gentoo:17898] [[44045,1],2] ORTE_ERROR_LOG: Unreachable in file routed_binomial.c at line 876
[gentoo:17898] [[44045,1],2] ORTE_ERROR_LOG: Unreachable in file base/ess_base_std_app.c at line 151
[gentoo:17896] [[44045,1],0]-[[44045,0],0] oob-tcp: Communication retries exceeded.  Can not communicate with peer
[gentoo:17896] [[44045,1],0] ORTE_ERROR_LOG: Unreachable in file base/routed_base_register_sync.c at line 86
[gentoo:17896] [[44045,1],0] ORTE_ERROR_LOG: Unreachable in file routed_binomial.c at line 876
[gentoo:17896] [[44045,1],0] ORTE_ERROR_LOG: Unreachable in file base/ess_base_std_app.c at line 151
[gentoo:17899] [[44045,1],3]-[[44045,0],0] oob-tcp: Communication retries exceeded.  Can not communicate with peer
[gentoo:17899] [[44045,1],3] ORTE_ERROR_LOG: Unreachable in file base/routed_base_register_sync.c at line 86
[gentoo:17899] [[44045,1],3] ORTE_ERROR_LOG: Unreachable in file routed_binomial.c at line 876
[gentoo:17899] [[44045,1],3] ORTE_ERROR_LOG: Unreachable in file base/ess_base_std_app.c at line 151
[gentoo:17897] [[44045,1],1]-[[44045,0],0] oob-tcp: Communication retries exceeded.  Can not communicate with peer
[gentoo:17897] [[44045,1],1] ORTE_ERROR_LOG: Unreachable in file util/show_help.c at line 591
[gentoo:17897] [[44045,1],1] ORTE_ERROR_LOG: Unreachable in file ess_env_module.c at line 154
[gentoo:17898] [[44045,1],2]-[[44045,0],0] oob-tcp: Communication retries exceeded.  Can not communicate with peer
[gentoo:17898] [[44045,1],2] ORTE_ERROR_LOG: Unreachable in file util/show_help.c at line 591
[gentoo:17898] [[44045,1],2] ORTE_ERROR_LOG: Unreachable in file ess_env_module.c at line 154
[gentoo:17896] [[44045,1],0]-[[44045,0],0] oob-tcp: Communication retries exceeded.  Can not communicate with peer
[gentoo:17896] [[44045,1],0] ORTE_ERROR_LOG: Unreachable in file util/show_help.c at line 591
[gentoo:17896] [[44045,1],0] ORTE_ERROR_LOG: Unreachable in file ess_env_module.c at line 154
[gentoo:17899] [[44045,1],3]-[[44045,0],0] oob-tcp: Communication retries exceeded.  Can not communicate with peer
[gentoo:17899] [[44045,1],3] ORTE_ERROR_LOG: Unreachable in file util/show_help.c at line 591
[gentoo:17899] [[44045,1],3] ORTE_ERROR_LOG: Unreachable in file ess_env_module.c at line 154
oob-tcp: Communication retries exceeded.  Can not communicate with peer[gentoo:17897] [[44045,1],1]-[[44045,0],0] oob-tcp: Communication retries exceeded.  Can not communicate with peer
[gentoo:17897] [[44045,1],1] ORTE_ERROR_LOG: Unreachable in file util/show_help.c at line 591
[gentoo:17897] [[44045,1],1] ORTE_ERROR_LOG: Unreachable in file runtime/orte_init.c at line 132
[gentoo:17896] [[44045,1],0]-[[44045,0],0] oob-tcp: Communication retries exceeded.  Can not communicate with peer
[gentoo:17896] [[44045,1],0] ORTE_ERROR_LOG: Unreachable in file util/show_help.c at line 591
[gentoo:17896] [[44045,1],0] ORTE_ERROR_LOG: Unreachable in file runtime/orte_init.c at line 132
[gentoo:17898] [[44045,1],2]-[[44045,0],0] oob-tcp: Communication retries exceeded.  Can not communicate with peer
[gentoo:17898] [[44045,1],2] ORTE_ERROR_LOG: Unreachable in file util/show_help.c at line 591
[gentoo:17898] [[44045,1],2] ORTE_ERROR_LOG: Unreachable in file runtime/orte_init.c at line 132
[gentoo:17899] [[44045,1],3]-[[44045,0],0] oob-tcp: Communication retries exceeded.  Can not communicate with peer
[gentoo:17899] [[44045,1],3] ORTE_ERROR_LOG: Unreachable in file util/show_help.c at line 591
[gentoo:17899] [[44045,1],3] ORTE_ERROR_LOG: Unreachable in file runtime/orte_init.c at line 132
[gentoo:17897] [[44045,1],1]-[[44045,0],0] oob-tcp: Communication retries exceeded.  Can not communicate with peer
[gentoo:17897] [[44045,1],1] ORTE_ERROR_LOG: Unreachable in file util/show_help.c at line 591
--------------------------------------------------------------------------
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):

  ompi_mpi_init: orte_init failed
  --> Returned "Unreachable" (-12) instead of "Success" (0)
--------------------------------------------------------------------------
*** The MPI_Init() function was called before MPI_INIT was invoked.
*** This is disallowed by the MPI standard.
*** Your MPI job will now abort.
[gentoo:17897] Abort before MPI_INIT completed successfully; not able to guarantee that all other processes were killed!
[gentoo:17896] [[44045,1],0]-[[44045,0],0] oob-tcp: Communication retries exceeded.  Can not communicate with peer
[gentoo:17896] [[44045,1],0] ORTE_ERROR_LOG: Unreachable in file util/show_help.c at line 591
--------------------------------------------------------------------------
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):

  ompi_mpi_init: orte_init failed
  --> Returned "Unreachable" (-12) instead of "Success" (0)
--------------------------------------------------------------------------
*** The MPI_Init() function was called before MPI_INIT was invoked.
*** This is disallowed by the MPI standard.
*** Your MPI job will now abort.
[gentoo:17896] Abort before MPI_INIT completed successfully; not able to guarantee that all other processes were killed!
[gentoo:17898] [[44045,1],2]-[[44045,0],0] oob-tcp: Communication retries exceeded.  Can not communicate with peer
[gentoo:17898] [[44045,1],2] ORTE_ERROR_LOG: Unreachable in file util/show_help.c at line 591
--------------------------------------------------------------------------
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):

  ompi_mpi_init: orte_init failed
  --> Returned "Unreachable" (-12) instead of "Success" (0)
--------------------------------------------------------------------------
*** The MPI_Init() function was called before MPI_INIT was invoked.
*** This is disallowed by the MPI standard.
*** Your MPI job will now abort.
[gentoo:17898] Abort before MPI_INIT completed successfully; not able to guarantee that all other processes were killed!
*** The MPI_Init() function was called before MPI_INIT was invoked.
*** This is disallowed by the MPI standard.
*** Your MPI job will now abort.
[gentoo:17899] Abort before MPI_INIT completed successfully; not able to guarantee that all other processes were killed!
[gentoo:17899] [[44045,1],3]-[[44045,0],0] oob-tcp: Communication retries exceeded.  Can not communicate with peer
[gentoo:17899] [[44045,1],3] ORTE_ERROR_LOG: Unreachable in file util/show_help.c at line 591
--------------------------------------------------------------------------
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):

  ompi_mpi_init: orte_init failed
  --> Returned "Unreachable" (-12) instead of "Success" (0)
--------------------------------------------------------------------------