I tried to run hello_c using mpiexec and received the following which I get earlier from other attempts. amos@linux-ym6f:~/Downloads/openmpi-1.4.4/examples> mpiexec hello_c [linux-ym6f:32043] [NO-NAME] ORTE_ERROR_LOG: Not found in file runtime/orte_init_stage1.c at line 182 -------------------------------------------------------------------------- It looks like orte_init failed for some reason; your parallel process is likely to abort. There are many reasons that a parallel process can fail during orte_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): orte_rml_base_select failed --> Returned value -13 instead of ORTE_SUCCESS -------------------------------------------------------------------------- [linux-ym6f:32043] [NO-NAME] ORTE_ERROR_LOG: Not found in file runtime/orte_system_init.c at line 42 [linux-ym6f:32043] [NO-NAME] ORTE_ERROR_LOG: Not found in file runtime/orte_init.c at line 52 -------------------------------------------------------------------------- Open RTE was unable to initialize properly. The error occured while attempting to orte_init(). Returned value -13 instead of ORTE_SUCCESS. --------------------------------------------------------------------------