diff --git a/ompi/mca/coll/monitoring/coll_monitoring_component.c b/ompi/mca/coll/monitoring/coll_monitoring_component.c
index 7ac99399dc8..461bcf855a9 100644
--- a/ompi/mca/coll/monitoring/coll_monitoring_component.c
+++ b/ompi/mca/coll/monitoring/coll_monitoring_component.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2016 Inria.  All rights reserved.
+ * Copyright (c) 2016-2017 Inria.  All rights reserved.
  * $COPYRIGHT$
  *
  * Additional copyrights may follow
@@ -16,9 +16,9 @@
 
 #define MONITORING_SAVE_PREV_COLL_API(__module, __comm, __api)          \
     do {                                                                \
-        if( NULL != __comm->c_coll.coll_ ## __api ## _module ) {        \
-            __module->real.coll_ ## __api = __comm->c_coll.coll_ ## __api; \
-            __module->real.coll_ ## __api ## _module = __comm->c_coll.coll_ ## __api ## _module; \
+        if( NULL != __comm->c_coll->coll_ ## __api ## _module ) {        \
+            __module->real.coll_ ## __api = __comm->c_coll->coll_ ## __api; \
+            __module->real.coll_ ## __api ## _module = __comm->c_coll->coll_ ## __api ## _module; \
             OBJ_RETAIN(__module->real.coll_ ## __api ## _module);       \
         } else {                                                        \
             /* If no function previously provided, do not monitor */    \
@@ -26,9 +26,9 @@
             OPAL_MONITORING_PRINT_WARN("COMM \"%s\": No monitoring available for " \
                                        "coll_" # __api, __comm->c_name); \
         }                                                               \
-        if( NULL != __comm->c_coll.coll_i ## __api ## _module ) {       \
-            __module->real.coll_i ## __api = __comm->c_coll.coll_i ## __api; \
-            __module->real.coll_i ## __api ## _module = __comm->c_coll.coll_i ## __api ## _module; \
+        if( NULL != __comm->c_coll->coll_i ## __api ## _module ) {       \
+            __module->real.coll_i ## __api = __comm->c_coll->coll_i ## __api; \
+            __module->real.coll_i ## __api ## _module = __comm->c_coll->coll_i ## __api ## _module; \
             OBJ_RETAIN(__module->real.coll_i ## __api ## _module);      \
         } else {                                                        \
             /* If no function previously provided, do not monitor */    \
diff --git a/ompi/mca/common/monitoring/common_monitoring.c b/ompi/mca/common/monitoring/common_monitoring.c
index 6d7d36e8f69..5ad49244223 100644
--- a/ompi/mca/common/monitoring/common_monitoring.c
+++ b/ompi/mca/common/monitoring/common_monitoring.c
@@ -73,10 +73,10 @@ static int nprocs_world = 0;
 opal_hash_table_t *common_monitoring_translation_ht = NULL;
 
 /* Reset all the monitoring arrays */
-static void mca_common_monitoring_reset( void );
+static void mca_common_monitoring_reset ( void );
 
 /* Flushes the monitored data and reset the values */
-static int mca_common_monitoring_flush(int fd, char* filename);
+static int mca_common_monitoring_flush (int fd, char* filename);
 
 /* Retreive the PML recorded count of messages sent */
 static int mca_common_monitoring_get_pml_count (const struct mca_base_pvar_t *pvar,
@@ -691,9 +691,6 @@ static void mca_common_monitoring_output( FILE *pf, int my_rank, int nbprocs )
                 fprintf(pf, "%" PRIu64 "%s", size_histogram[i * max_size_histogram + j],
                         j < max_size_histogram - 1 ? "," : "\n");
         }
-        /* reset phase array */
-        pml_data[i] = 0;
-        pml_count[i] = 0;
     }
 
     /* Dump outgoing synchronization/collective messages */
@@ -715,9 +712,6 @@ static void mca_common_monitoring_output( FILE *pf, int my_rank, int nbprocs )
                                 j < max_size_histogram - 1 ? "," : "\n");
                 }
             }
-            /* reset phase array */
-            filtered_pml_data[i] = 0;
-            filtered_pml_count[i] = 0;
         }
     }
 
@@ -732,23 +726,15 @@ static void mca_common_monitoring_output( FILE *pf, int my_rank, int nbprocs )
             fprintf(pf, "R\t%" PRId32 "\t%" PRId32 "\t%" PRIu64 " bytes\t%" PRIu64 " msgs sent\n",
                     my_rank, i, osc_data_r[i], osc_count_r[i]);
         }
-        /* reset phase array */
-        osc_data_s[i]  = 0;
-        osc_count_s[i] = 0;
-        osc_data_r[i]  = 0;
-        osc_count_r[i] = 0;
     }
 
     /* Dump collectives */
     fprintf(pf, "# COLLECTIVES\n");
     for (int i = 0 ; i < nbprocs ; i++) {
         if(coll_count[i] > 0) {
-            fprintf(pf, "C\t%" PRId32 "\t%" PRId32 "\t%" PRIu64 " bytes\t%" PRIu64 " msgs sent\t",
+            fprintf(pf, "C\t%" PRId32 "\t%" PRId32 "\t%" PRIu64 " bytes\t%" PRIu64 " msgs sent\n",
                     my_rank, i, coll_data[i], coll_count[i]);
         }
-        /* reset phase array */
-        coll_data[i] = 0;
-        coll_count[i] = 0;
     }
     mca_common_monitoring_coll_flush_all(pf);
 }
@@ -795,5 +781,7 @@ static int mca_common_monitoring_flush(int fd, char* filename)
 
         fclose(pf);
     }
+    /* Reset to 0 all monitored data */
+    mca_common_monitoring_reset();
     return OMPI_SUCCESS;
 }
diff --git a/ompi/mca/common/monitoring/common_monitoring_coll.c b/ompi/mca/common/monitoring/common_monitoring_coll.c
index b3783d4356a..0049eb00100 100644
--- a/ompi/mca/common/monitoring/common_monitoring_coll.c
+++ b/ompi/mca/common/monitoring/common_monitoring_coll.c
@@ -42,11 +42,27 @@ struct mca_monitoring_coll_data_t {
 /* Collectives operation monitoring */
 static opal_hash_table_t *comm_data = NULL;
 
+/* Check whether the communicator's name have been changed. Update the
+ * data->comm_name field if so.
+ */
+static inline void mca_common_monitoring_coll_check_name(mca_monitoring_coll_data_t*data)
+{
+    if( data->comm_name && data->p_comm && (data->p_comm->c_flags & OMPI_COMM_NAMEISSET)
+        && data->p_comm->c_name && 0 <  strlen(data->p_comm->c_name)
+        && 0 != strncmp(data->p_comm->c_name, data->comm_name, OPAL_MAX_OBJECT_NAME - 1) )
+    {
+        free(data->comm_name);
+        data->comm_name = strdup(data->p_comm->c_name);
+    }
+}
+
 static inline void mca_common_monitoring_coll_cache(mca_monitoring_coll_data_t*data)
 {
     int world_rank;
     if( NULL == data->comm_name && 0 < strlen(data->p_comm->c_name) ) {
         data->comm_name = strdup(data->p_comm->c_name);
+    } else {
+        mca_common_monitoring_coll_check_name(data);
     }
     if( -1 == data->world_rank ) {
         /* Get current process world_rank */
@@ -150,6 +166,9 @@ void mca_common_monitoring_coll_finalize( void )
 
 void mca_common_monitoring_coll_flush(FILE *pf, mca_monitoring_coll_data_t*data)
 {
+    /* Check for any change in the communicator's name */
+    mca_common_monitoring_coll_check_name(data);
+
     /* Flush data */
     fprintf(pf,
             "D\t%s\tprocs: %s\n"
diff --git a/test/monitoring/check_monitoring.c b/test/monitoring/check_monitoring.c
index 9e4369a8a3e..684aa1a059d 100644
--- a/test/monitoring/check_monitoring.c
+++ b/test/monitoring/check_monitoring.c
@@ -1,8 +1,8 @@
 /*
- * Copyright (c) 2016 Inria.  All rights reserved.
- * Copyright (c) 2017 The University of Tennessee and The University
- *                    of Tennessee Research Foundation.  All rights
- *                    reserved.
+ * Copyright (c) 2016-2017 Inria.  All rights reserved.
+ * Copyright (c) 2017      The University of Tennessee and The University
+ *                         of Tennessee Research Foundation.  All rights
+ *                         reserved.
  * $COPYRIGHT$
  *
  * Additional copyrights may follow
@@ -305,9 +305,9 @@ static inline int pvar_coll_check(MPI_T_pvar_session session, int world_size, in
             fprintf(stderr, "Error in %s: size_values[%d]=%" PRIu64 ", and should be equal to %" PRIu64 ".\n",
                     __func__, i, svalues[i], (uint64_t) 0);
             ret = -1;
-        } else if ( i != world_rank && svalues[i] < (uint64_t) ((world_size * (world_size - 1) * 2 * 13 * sizeof(char)) + 3 * 13 * sizeof(char) + sizeof(int)) ) {
+        } else if ( i != world_rank && svalues[i] < (uint64_t) (world_size * (2 * 13 * sizeof(char) + sizeof(int)) + 13 * 3 * sizeof(char) + sizeof(int)) ) {
             fprintf(stderr, "Error in %s: size_values[%d]=%" PRIu64 ", and should be >= %" PRIu64 ".\n",
-                    __func__, i, svalues[i], (uint64_t) ((world_size * (world_size - 1) * 2 * 13 * sizeof(char)) + 3 * 13 * sizeof(char) + sizeof(int)));
+                    __func__, i, svalues[i], (uint64_t) (world_size * (2 * 13 * sizeof(char) + sizeof(int)) + 13 * 3 * sizeof(char) + sizeof(int)));
             ret = -1;
         }
     }