diff --git a/ompi/mca/io/ompio/io_ompio.h b/ompi/mca/io/ompio/io_ompio.h
index 5f6a137a4f..4f54e9af6d 100644
--- a/ompi/mca/io/ompio/io_ompio.h
+++ b/ompi/mca/io/ompio/io_ompio.h
@@ -112,7 +112,7 @@ OMPI_DECLSPEC extern int mca_io_ompio_coll_timing_info;
 
 #define OMPIO_UNIFORM_DIST_THRESHOLD     0.5
 #define OMPIO_CONTG_THRESHOLD        1048576
-#define OMPIO_CONTG_FACTOR                 4
+#define OMPIO_CONTG_FACTOR                 8
 #define OMPIO_DEFAULT_STRIPE_SIZE    1048576
 #define OMPIO_PROCS_PER_GROUP_TAG          0
 #define OMPIO_PROCS_IN_GROUP_TAG           1
diff --git a/ompi/mca/io/ompio/io_ompio_component.c b/ompi/mca/io/ompio/io_ompio_component.c
index 9007d2f401..af8918985c 100644
--- a/ompi/mca/io/ompio/io_ompio_component.c
+++ b/ompi/mca/io/ompio/io_ompio_component.c
@@ -38,7 +38,7 @@ int mca_io_ompio_record_offset_info = 0;
 int mca_io_ompio_coll_timing_info = 0;
 int mca_io_ompio_sharedfp_lazy_open = 1;
 
-int mca_io_ompio_grouping_option=4;
+int mca_io_ompio_grouping_option=5;
 
 /*
  * Private functions
@@ -202,12 +202,12 @@ static int register_component(void)
                                            MCA_BASE_VAR_SCOPE_READONLY,
                                            &mca_io_ompio_sharedfp_lazy_open);
 
-    mca_io_ompio_grouping_option = 4;
+    mca_io_ompio_grouping_option = 5;
     (void) mca_base_component_var_register(&mca_io_ompio_component.io_version,
                                            "grouping_option",
                                            "Option for grouping of processes in the aggregator selection "
-                                           "1: Data volume based grouping 2: create uniform groups 3: maximimze "
-                                           "contiguity 4: hybrid optimization (default) 5: simple/no optimization "
+                                           "1: Data volume based grouping 2: maximizing group size uniformity 3: maximimze "
+                                           "data contiguity 4: hybrid optimization  5: simple (default) "
                                            "6: skip refinement step",
                                            MCA_BASE_VAR_TYPE_INT, NULL, 0, 0,
                                            OPAL_INFO_LVL_9,
diff --git a/ompi/mca/io/ompio/io_ompio_file_set_view.c b/ompi/mca/io/ompio/io_ompio_file_set_view.c
index c9b2f1087d..0cf04b1373 100644
--- a/ompi/mca/io/ompio/io_ompio_file_set_view.c
+++ b/ompi/mca/io/ompio/io_ompio_file_set_view.c
@@ -328,8 +328,8 @@ int mca_io_ompio_simple_grouping(mca_io_ompio_file_t *fh,
         group_size  = (((int)stripe_size/(int)fh->f_cc_size) > fh->f_size ) ? fh->f_size : ((int)stripe_size/(int)fh->f_cc_size);
         *num_groups = fh->f_size / group_size;
     }
-    else if ( fh->f_cc_size < OMPIO_CONTG_FACTOR * stripe_size) {
-        *num_groups = fh->f_size / OMPIO_CONTG_FACTOR;
+    else if ( fh->f_cc_size <= OMPIO_CONTG_FACTOR * stripe_size) {
+        *num_groups = fh->f_size/OMPIO_CONTG_FACTOR > 0 ? (fh->f_size/OMPIO_CONTG_FACTOR) : 1 ;
         group_size  = OMPIO_CONTG_FACTOR;
     } 
     else {
@@ -350,7 +350,7 @@ int mca_io_ompio_simple_grouping(mca_io_ompio_file_t *fh,
             k++;
         }
     }
-    
+    sleep (10); 
     return OMPI_SUCCESS;
 }