diff --git a/orte/mca/odls/base/odls_base_default_fns.c b/orte/mca/odls/base/odls_base_default_fns.c
old mode 100755
new mode 100644
index d9b3b858a9..f98dd7468b
--- a/orte/mca/odls/base/odls_base_default_fns.c
+++ b/orte/mca/odls/base/odls_base_default_fns.c
@@ -100,7 +100,6 @@
 #include "orte/mca/odls/base/base.h"
 #include "orte/mca/odls/base/odls_private.h"
 
-#if 0
 static void setup_cbfunc(int status,
                          opal_list_t *info,
                          void *provided_cbdata,
@@ -132,9 +131,8 @@ static void setup_cbfunc(int status,
 
     /* move to next stage */
     ORTE_ACTIVATE_JOB_STATE(jdata, ORTE_JOB_STATE_SEND_LAUNCH_MSG);
-}
-#endif
 
+}
 /* IT IS CRITICAL THAT ANY CHANGE IN THE ORDER OF THE INFO PACKED IN
  * THIS FUNCTION BE REFLECTED IN THE CONSTRUCT_CHILD_LIST PARSER BELOW
 */
@@ -433,8 +431,7 @@ int orte_odls_base_default_get_add_procs_data(opal_buffer_t *buffer,
     }
 
     /* get any application prep info */
-#if 0
-    if (NULL != opal_pmix.server_setup_application) {
+    if (orte_enable_instant_on_support && NULL != opal_pmix.server_setup_application) {
         /* we don't want to block here because it could
          * take some indeterminate time to get the info */
         if (OPAL_SUCCESS != (rc = opal_pmix.server_setup_application(jdata->jobid, NULL, setup_cbfunc, jdata))) {
@@ -442,7 +439,6 @@ int orte_odls_base_default_get_add_procs_data(opal_buffer_t *buffer,
         }
         return rc;
     }
-#endif
 
     /* move to next stage */
     ORTE_ACTIVATE_JOB_STATE(jdata, ORTE_JOB_STATE_SEND_LAUNCH_MSG);
@@ -457,13 +453,11 @@ static void fm_release(void *cbdata)
     OBJ_RELEASE(bptr);
 }
 
-#if 0
 static void ls_cbunc(int status, void *cbdata)
 {
     opal_pmix_lock_t *lock = (opal_pmix_lock_t*)cbdata;
     OPAL_PMIX_WAKEUP_THREAD(lock);
 }
-#endif
 
 int orte_odls_base_default_construct_child_list(opal_buffer_t *buffer,
                                                 orte_jobid_t *job)
@@ -801,11 +795,11 @@ int orte_odls_base_default_construct_child_list(opal_buffer_t *buffer,
         goto REPORT_ERROR;
     }
 
-#if 0
     /* if we have local support setup info, then execute it here - we
      * have to do so AFTER we register the nspace so the PMIx server
      * has the nspace info it needs */
-    if (0 < opal_list_get_size(&local_support) &&
+    if (orte_enable_instant_on_support &&
+        0 < opal_list_get_size(&local_support) &&
         NULL != opal_pmix.server_setup_local_support) {
         if (OPAL_SUCCESS != (rc = opal_pmix.server_setup_local_support(jdata->jobid, &local_support,
                                                                        ls_cbunc, &lock))) {
@@ -815,8 +809,6 @@ int orte_odls_base_default_construct_child_list(opal_buffer_t *buffer,
     } else {
         lock.active = false;  // we won't get a callback
     }
-#endif
-    lock.active = false;  // we won't get a callback
 
     /* if we have a file map, then we need to load it */
     if (orte_get_attribute(&jdata->attributes, ORTE_JOB_FILE_MAPS, (void**)&bptr, OPAL_BUFFER)) {
@@ -1067,11 +1059,10 @@ void orte_odls_base_spawn_proc(int fd, short sd, void *cbdata)
                         ORTE_NAME_PRINT(ORTE_PROC_MY_NAME),
                         ORTE_NAME_PRINT(&child->name));
 
-  //  if (15 < opal_output_get_verbosity(orte_odls_base_framework.framework_output)) {
+    if (15 < opal_output_get_verbosity(orte_odls_base_framework.framework_output)) {
         /* dump what is going to be exec'd */
-        opal_dss.dump(0, app, ORTE_APP_CONTEXT);
-  //  }
-        exit(1);
+        opal_dss.dump(orte_odls_base_framework.framework_output, app, ORTE_APP_CONTEXT);
+    }
 
     if (ORTE_SUCCESS != (rc = cd->fork_local(cd))) {
         /* error message already output */
diff --git a/orte/mca/schizo/ompi/schizo_ompi.c b/orte/mca/schizo/ompi/schizo_ompi.c
index 5e1daf9e21..ccde331d80 100644
--- a/orte/mca/schizo/ompi/schizo_ompi.c
+++ b/orte/mca/schizo/ompi/schizo_ompi.c
@@ -509,6 +509,12 @@ static opal_cmd_line_init_t cmd_line_init[] = {
       "Forward mpirun port to compute node daemons so all will use it",
       OPAL_CMD_LINE_OTYPE_LAUNCH },
 
+    /* enable instant-on support */
+    { "orte_enable_instant_on_support", '\0', "enable-instant-on-support", "enable-instant-on-support", 0,
+      NULL, OPAL_CMD_LINE_TYPE_BOOL,
+      "Enable PMIx-based instant on launch support (experimental)",
+      OPAL_CMD_LINE_OTYPE_LAUNCH },
+
     /* End of list */
     { NULL, '\0', NULL, NULL, 0,
       NULL, OPAL_CMD_LINE_TYPE_NULL, NULL }
@@ -874,7 +880,7 @@ static int setup_fork(orte_job_t *jdata,
         tmp_app = (orte_app_context_t*)opal_pointer_array_get_item(jdata->apps, 0);
         assert (NULL != tmp_app);
         orte_get_attribute(&tmp_app->attributes, ORTE_APP_PREFIX_DIR, (void**)&param, OPAL_STRING);
-    } 
+    }
     for (i = 0; NULL != param && NULL != app->env && NULL != app->env[i]; ++i) {
         char *newenv;
 
diff --git a/orte/runtime/orte_globals.c b/orte/runtime/orte_globals.c
index 1f7fc2ec7f..4f043329d1 100644
--- a/orte/runtime/orte_globals.c
+++ b/orte/runtime/orte_globals.c
@@ -205,6 +205,9 @@ char *orte_job_ident = NULL;
 bool orte_execute_quiet = false;
 bool orte_report_silent_errors = false;
 
+/* enable PMIx-based "instant on" support */
+bool orte_enable_instant_on_support = false;
+
 /* See comment in orte/tools/orterun/debuggers.c about this MCA
    param */
 bool orte_in_parallel_debugger = false;
diff --git a/orte/runtime/orte_globals.h b/orte/runtime/orte_globals.h
index 1ae4de3eee..3c93c6dbe2 100644
--- a/orte/runtime/orte_globals.h
+++ b/orte/runtime/orte_globals.h
@@ -588,6 +588,9 @@ ORTE_DECLSPEC extern char *orte_daemon_cores;
 /* Max time to wait for stack straces to return */
 ORTE_DECLSPEC extern int orte_stack_trace_wait_timeout;
 
+/* enable PMIx-based "instant on" support */
+ORTE_DECLSPEC extern bool orte_enable_instant_on_support;
+
 END_C_DECLS
 
 #endif /* ORTE_RUNTIME_ORTE_GLOBALS_H */
diff --git a/orte/runtime/orte_mca_params.c b/orte/runtime/orte_mca_params.c
index afad291116..0053a663e4 100644
--- a/orte/runtime/orte_mca_params.c
+++ b/orte/runtime/orte_mca_params.c
@@ -13,7 +13,7 @@
  * Copyright (c) 2009-2010 Oracle and/or its affiliates.  All rights reserved.
  * Copyright (c) 2012-2013 Los Alamos National Security, LLC.
  *                         All rights reserved
- * Copyright (c) 2013-2017 Intel, Inc.  All rights reserved.
+ * Copyright (c) 2013-2018 Intel, Inc. All rights reserved.
  * Copyright (c) 2014-2018 Research Organization for Information Science
  *                         and Technology (RIST).  All rights reserved.
  * Copyright (c) 2017      IBM Corporation.  All rights reserved.
@@ -790,5 +790,12 @@ int orte_register_params(void)
                                   OPAL_INFO_LVL_3, MCA_BASE_VAR_SCOPE_ALL,
                                   &orte_data_server_uri);
 
+    orte_enable_instant_on_support = false;
+    (void) mca_base_var_register ("orte", "orte", NULL, "enable_instant_on_support",
+                                  "Enable PMIx-based instant on launch support (experimental)",
+                                  MCA_BASE_VAR_TYPE_BOOL, NULL, 0, 0,
+                                  OPAL_INFO_LVL_9, MCA_BASE_VAR_SCOPE_READONLY,
+                                  &orte_enable_instant_on_support);
+
     return ORTE_SUCCESS;
 }