Ensure that mpirun correctly selects the HNP ess component without attempting to init the PMI subsystem as mpirun won't be supported anyway, so let's avoid the error message. Also, daemons launched by the plm/slurm component must use the ess/slurm module as we cannot trust the Slurm PMI_Init functions to correctly tell us when PMI support is available.

orte/mca/plm/slurm/plm_slurm_module.c

@@ -347,7 +347,7 @@ static void launch_daemons(int fd, short args, void *cbdata)
     
     /* Add basic orted command line options, including debug flags */
     orte_plm_base_orted_append_basic_args(&argc, &argv,
-                                          NULL, &proc_vpid_index,
+                                          "slurm", &proc_vpid_index,
                                           nodelist_flat);
     free(nodelist_flat);
 

orte/tools/orterun/orterun.c

@@ -849,6 +849,11 @@ int orterun(int argc, char *argv[])
     free(tmp_env_var);
 #endif
 
+    /* force selection of the HNP ess module to avoid
+     * the PMI component attempting to initialize and
+     * generating a false error message */
+    putenv(OPAL_MCA_PREFIX"ess=hnp");
+
     /* Intialize our Open RTE environment
      * Set the flag telling orte_init that I am NOT a
      * singleton, but am "infrastructure" - prevents setting