changed mindist mapping policy specifier from map-bt dist:device,modifiers to --map-by dist:modifiers -mca rmaps_dist_device device

orte/mca/rmaps/base/help-orte-rmaps-base.txt

@@ -333,4 +333,8 @@ were given to support the requested number of processes:
 
 We cannot continue - please adjust either the number of processes
 or provide more node locations in the file.
-
+#
+[device-not-specified]
+The request to map processes by distance could not be completed
+because device to map near by was not specified. Please, use
+rmaps_dist_device mca parameter to set it.

orte/mca/rmaps/base/rmaps_base_frame.c

@@ -70,6 +70,7 @@ static bool rmaps_base_oversubscribe = false;
 static bool rmaps_base_display_devel_map = false;
 static bool rmaps_base_display_diffable_map = false;
 static char *rmaps_base_topo_file = NULL;
+static char *rmaps_dist_device = NULL;
 
 static int orte_rmaps_base_register(mca_base_register_flag_t flags)
 {
@@ -166,6 +167,14 @@ static int orte_rmaps_base_register(mca_base_register_flag_t flags)
                                    OPAL_INFO_LVL_9,
                                    MCA_BASE_VAR_SCOPE_READONLY, &orte_rmaps_base.cpus_per_rank);
     mca_base_var_register_synonym(var_id, "orte", "rmaps", "base", "cpus_per_rank", 0);
+
+    rmaps_dist_device = NULL;
+    var_id = mca_base_var_register("orte", "rmaps", NULL, "dist_device",
+                                   "Set device to map by distance near by",
+                                   MCA_BASE_VAR_TYPE_STRING, NULL, 0, 0,
+                                   OPAL_INFO_LVL_9,
+                                   MCA_BASE_VAR_SCOPE_READONLY,
+                                   &rmaps_dist_device);
 #endif
 
     rmaps_base_no_schedule_local = false;
@@ -616,6 +625,7 @@ int orte_rmaps_base_set_mapping_policy(orte_mapping_policy_t *policy,
     int rc;
     size_t len;
     char *spec;
+    char *pch;
 
     /* set defaults */
     tmp = 0;
@@ -661,30 +671,7 @@ int orte_rmaps_base_set_mapping_policy(orte_mapping_policy_t *policy,
              * and save the second argument as the device
              */
 #if OPAL_HAVE_HWLOC
-            if (NULL != device && 0 == strncasecmp(spec, "dist", strlen(spec))) {
-                ORTE_SET_MAPPING_POLICY(tmp, ORTE_MAPPING_BYDIST);
-                /* the first argument after the colon *must* be the
-                 * device we are mapping near - however, other modifiers
-                 * could have been provided, so check for them, okay if
-                 * none found
-                 */
-                if (NULL != (ptr = strchr(ck, ','))) {
-                    *ptr = '\0';
-                    ptr++; // move past the comma
-                    /* check the remaining string for modifiers - may be none, so
-                     * don't emit an error message if the modifier isn't recognized
-                     */
-                    if (ORTE_ERR_SILENT == (rc = check_modifiers(ptr, &tmp)) &&
-                        ORTE_ERR_BAD_PARAM != rc) {
-                        free(spec);
-                        return ORTE_ERR_SILENT;
-                    }
-                }
-                *device = strdup(ck);
-                ORTE_SET_MAPPING_DIRECTIVE(tmp, ORTE_MAPPING_GIVEN);
-                free(spec);
-                goto setpolicy;
-            } else if (0 == strncasecmp(spec, "ppr", strlen(spec))) {
+            if (0 == strncasecmp(spec, "ppr", strlen(spec))) {
                 /* we have to allow additional modifiers here - e.g., specifying
                  * #pe's/proc or oversubscribe - so check for modifiers
                  */
@@ -755,6 +742,18 @@ int orte_rmaps_base_set_mapping_policy(orte_mapping_policy_t *policy,
              * we need to treat those hwthreads as separate cpus
              */
             opal_hwloc_use_hwthreads_as_cpus = true;            
+        } else if ( NULL != device && 0 == strncasecmp(spec, "dist", len)) {
+            if (NULL != rmaps_dist_device) {
+                if (NULL != (pch = strchr(rmaps_dist_device, ':'))) {
+                    *pch = '\0';
+                }
+                *device = strdup(rmaps_dist_device);
+                ORTE_SET_MAPPING_POLICY(tmp, ORTE_MAPPING_BYDIST);
+            } else {
+                orte_show_help("help-orte-rmaps-base.txt", "device-not-specified", true);
+                free(spec);
+                return ORTE_ERR_SILENT;
+            }
 #endif
         } else {
             orte_show_help("help-orte-rmaps-base.txt", "unrecognized-policy", true, "mapping", spec);

orte/mca/rmaps/mindist/help-orte-rmaps-md.txt

@@ -35,8 +35,8 @@ On at least one node, more than one of the specified device was discovered.
 In this scenario, passing the 'auto' option to the rmaps minimum 
 distance mapper is ambiguous and therefore not valid.
 Please select the particular device that you would like 
-to be mapped nearest via -mca rmaps_base_mapping_policy dist:<device>
-or --map-by dist:<device>, e.g. --map-by dist:mlx4_0.
+to be mapped nearest via -mca rmaps_dist_device <device> option,
+e.g. --map-by dist -mca rmaps_dist_device mlx4_0.
 
   Device type: %s
   #Devices: %d