Ensure that the pmix server system-level rendezvous file is only output by the HNP as (at least for slurm on cray) a daemon could be colocated with the HNP and overwrite the file. Update the scaling.pl script to only use the system-level rendezvous so it doesn't get rejected by a colocated daemon

Signed-off-by: Ralph Castain <rhc@open-mpi.org>

contrib/scaling/scaling.pl

@@ -27,7 +27,7 @@ my @tests = qw(/bin/true ./orte_no_op ./mpi_no_op ./mpi_no_op ./mpi_no_op);
 my @options = ("", "", "", "-mca mpi_add_procs_cutoff 0 -mca pmix_base_async_modex 1", "-mca mpi_add_procs_cutoff 0 -mca pmix_base_async_modex 1 -mca async_mpi_init 1 -mca async_mpi_finalize 1");
 my @starterlist = qw(mpirun prun srun aprun);
 my @starteroptionlist = (" --novm",
-                         "",
+                         " --system-server-only",
                          " --distribution=cyclic --ntasks-per-node=",
                          " -N");
 
@@ -267,7 +267,7 @@ foreach $starter (@starters) {
     # if we are going to use the dvm, then we
     if ($starter eq "prun") {
         # need to start it
-        $cmd = "orte-dvm -mca pmix_system_server 1 2>&1 &";
+        $cmd = "orte-dvm --system_server 2>&1 &";
         if ($myresults) {
             print FILE "\n\n$cmd\n";
         }
@@ -341,7 +341,7 @@ foreach $starter (@starters) {
     }
     if ($havedvm) {
         if (!$SHOWME) {
-            $cmd = "prun --terminate";
+            $cmd = "prun --system-server-only --terminate";
             system($cmd);
         }
         $havedvm = 0;

orte/orted/pmix/pmix_server.c

@@ -273,8 +273,10 @@ int pmix_server_init(void)
     }
 
     /* if requested, tell the server to drop a system-level
-     * PMIx connection point */
+     * PMIx connection point - only do this for the HNP as, in
-    if (orte_pmix_server_globals.system_server) {
+     * at least one case, a daemon can be colocated with the
+     * HNP and would overwrite the server rendezvous file */
+    if (orte_pmix_server_globals.system_server && ORTE_PROC_IS_HNP) {
         kv = OBJ_NEW(opal_value_t);
         kv->key = strdup(OPAL_PMIX_SERVER_SYSTEM_SUPPORT);
         kv->type = OPAL_BOOL;