diff -ur openmpi-1.4.1/orte/mca/odls/base/odls_base_default_fns.c openmpi-1.4.1-new/orte/mca/odls/base/odls_base_default_fns.c
--- openmpi-1.4.1/orte/mca/odls/base/odls_base_default_fns.c	2009-12-08 20:36:37.000000000 +0000
+++ openmpi-1.4.1-new/orte/mca/odls/base/odls_base_default_fns.c	2010-02-27 12:21:14.000000000 +0000
@@ -74,7 +74,7 @@
 #include "orte/mca/odls/base/base.h"
 #include "orte/mca/odls/base/odls_private.h"
 
-static int8_t *app_idx;
+static int32_t *app_idx;
 
 /* 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
@@ -1555,7 +1577,7 @@
     nrank = 0;
     opal_dss.pack(&buffer, &nrank, 1, ORTE_NODE_RANK);  /* node rank */
     one8 = 0;
-    opal_dss.pack(&buffer, &one8, 1, OPAL_INT8);  /* app_idx */
+    opal_dss.pack(&buffer, &one32, 1, OPAL_INT32);  /* app_idx */
     jobdat->pmap = (opal_byte_object_t*)malloc(sizeof(opal_byte_object_t));
     opal_dss.unload(&buffer, (void**)&jobdat->pmap->bytes, &jobdat->pmap->size);
     OBJ_DESTRUCT(&buffer);
diff -ur openmpi-1.4.1/orte/runtime/orte_globals.h openmpi-1.4.1-new/orte/runtime/orte_globals.h
--- openmpi-1.4.1/orte/runtime/orte_globals.h	2009-12-08 20:36:44.000000000 +0000
+++ openmpi-1.4.1-new/orte/runtime/orte_globals.h	2010-02-27 12:30:20.000000000 +0000
@@ -137,7 +137,7 @@
     /** Parent object */
     opal_object_t super;
     /** Unique index when multiple apps per job */
-    int8_t idx;
+    int32_t idx;
     /** Absolute pathname of argv[0] */
     char   *app;
     /** Number of copies of this process that are to be launched */
@@ -382,7 +382,7 @@
     /* exit code */
     orte_exit_code_t exit_code;
     /* the app_context that generated this proc */
-    int8_t app_idx;
+    int32_t app_idx;
     /* a cpu list, if specified by the user */
     char *slot_list;
     /* pointer to the node where this proc is executing */
diff -ur openmpi-1.4.1/orte/util/nidmap.c openmpi-1.4.1-new/orte/util/nidmap.c
--- openmpi-1.4.1/orte/util/nidmap.c	2009-12-08 20:36:44.000000000 +0000
+++ openmpi-1.4.1-new/orte/util/nidmap.c	2010-02-27 12:23:18.000000000 +0000
@@ -589,7 +589,7 @@
     int32_t *nodes;
     orte_proc_t **procs;
     orte_vpid_t i;
-    int8_t *tmp;
+    int32_t *tmp;
     opal_buffer_t buf;
     orte_local_rank_t *lrank;
     orte_node_rank_t *nrank;
@@ -645,11 +645,11 @@
     free(nrank);
     
     /* transfer and pack the app_idx in one pack */
-    tmp = (int8_t*)malloc(jdata->num_procs);
+    tmp = (int32_t*)malloc(jdata->num_procs * sizeof(int32_t));
     for (i=0; i < jdata->num_procs; i++) {
         tmp[i] = procs[i]->app_idx;
     }
-    if (ORTE_SUCCESS != (rc = opal_dss.pack(&buf, tmp, jdata->num_procs, OPAL_INT8))) {
+    if (ORTE_SUCCESS != (rc = opal_dss.pack(&buf, tmp, jdata->num_procs, OPAL_INT32))) {
         ORTE_ERROR_LOG(rc);
         return rc;
     }
@@ -664,7 +665,7 @@
 
 
 int orte_util_decode_pidmap(opal_byte_object_t *bo, orte_vpid_t *nprocs,
-                            opal_value_array_t *procs, int8_t **app_idx,
+                            opal_value_array_t *procs, int32_t **app_idx,
                             char ***slot_str)
 {
     orte_vpid_t i, num_procs;
@@ -672,7 +673,7 @@
     int32_t *nodes;
     orte_local_rank_t *local_rank;
     orte_node_rank_t *node_rank;
-    int8_t *idx;
+    int32_t *idx;
     orte_std_cntr_t n;
     opal_buffer_t buf;
     int rc;
@@ -746,10 +747,10 @@
     }
     
     /* allocate memory for app_idx */
-    idx = (int8_t*)malloc(num_procs);
+    idx = (int32_t*)malloc(num_procs * sizeof(int32_t));
     /* unpack app_idx in one shot */
     n=num_procs;
-    if (ORTE_SUCCESS != (rc = opal_dss.unpack(&buf, idx, &n, OPAL_INT8))) {
+    if (ORTE_SUCCESS != (rc = opal_dss.unpack(&buf, idx, &n, OPAL_INT32))) {
         ORTE_ERROR_LOG(rc);
         return rc;
     }
diff -ur openmpi-1.4.1/orte/util/nidmap.h openmpi-1.4.1-new/orte/util/nidmap.h
--- openmpi-1.4.1/orte/util/nidmap.h	2009-12-08 20:36:44.000000000 +0000
+++ openmpi-1.4.1-new/orte/util/nidmap.h	2010-02-27 11:59:52.000000000 +0000
@@ -49,7 +49,7 @@
 
 ORTE_DECLSPEC int orte_util_encode_pidmap(orte_job_t *jdata, opal_byte_object_t *boptr);
 ORTE_DECLSPEC int orte_util_decode_pidmap(opal_byte_object_t *boptr, orte_vpid_t *num_procs,
-                                          opal_value_array_t *procs, int8_t **app_idx,
+                                          opal_value_array_t *procs, int32_t **app_idx,
                                           char ***slot_str);