diff --git a/src/ior.c b/src/ior.c
index 64530fd..15b1d07 100755
--- a/src/ior.c
+++ b/src/ior.c
@@ -939,7 +939,7 @@ static void InitTests(IOR_test_t *tests, MPI_Comm com)
                 params->testComm = com;
                 params->nodes = params->numTasks / tasksPerNode;
                 params->tasksPerNode = tasksPerNode;
-                params->tasksBlockMapping = QueryNodeMapping(com);
+                params->tasksBlockMapping = QueryNodeMapping(com,false);
                 if (params->numTasks == 0) {
                   params->numTasks = size;
                 }
@@ -1223,7 +1223,7 @@ static void TestIoSys(IOR_test_t *test)
         }
         if (rank == 0 && params->reorderTasks == TRUE && verbose >= VERBOSE_1) {
                 fprintf(out_logfile,
-                        "Using reorderTasks '-C' (expecting block, not cyclic, task assignment)\n");
+                        "Using reorderTasks '-C' (useful to avoid read cache in client)\n");
                 fflush(out_logfile);
         }
         params->tasksPerNode = CountTasksPerNode(testComm);
diff --git a/src/mdtest.c b/src/mdtest.c
index 127aa5f..f65ea7f 100644
--- a/src/mdtest.c
+++ b/src/mdtest.c
@@ -1862,7 +1862,7 @@ mdtest_results_t * mdtest_run(int argc, char **argv, MPI_Comm world_com, FILE *
       {'l', NULL,        "last number of tasks on which the test will run", OPTION_OPTIONAL_ARGUMENT, 'd', & last},
       {'L', NULL,        "files only at leaf level of tree", OPTION_FLAG, 'd', & leaf_only},
       {'n', NULL,        "every process will creat/stat/read/remove # directories and files", OPTION_OPTIONAL_ARGUMENT, 'l', & items},
-      {'N', NULL,        "stride # between neighbor tasks for file/dir operation (local=0)", OPTION_OPTIONAL_ARGUMENT, 'd', & nstride},
+      {'N', NULL,        "stride # between tasks for file/dir operation (local=0; set to 1 to avoid client cache)", OPTION_OPTIONAL_ARGUMENT, 'd', & nstride},
       {'p', NULL,        "pre-iteration delay (in seconds)", OPTION_OPTIONAL_ARGUMENT, 'd', & pre_delay},
       {'R', NULL,        "random access to files (only for stat)", OPTION_FLAG, 'd', & randomize},
       {0, "random-seed", "random seed for -R", OPTION_OPTIONAL_ARGUMENT, 'd', & random_seed},
@@ -2065,7 +2065,7 @@ mdtest_results_t * mdtest_run(int argc, char **argv, MPI_Comm world_com, FILE *
     VERBOSE(3,-1,"main (before display_freespace): testdirpath is '%s'", testdirpath );
 
     if (rank == 0) display_freespace(testdirpath);
-    int tasksBlockMapping = QueryNodeMapping(testComm);
+    int tasksBlockMapping = QueryNodeMapping(testComm, true);
 
     /* set the shift to mimic IOR and shift by procs per node */
     if (nstride > 0) {
diff --git a/src/parse_options.c b/src/parse_options.c
index ba72413..af30c36 100755
--- a/src/parse_options.c
+++ b/src/parse_options.c
@@ -471,7 +471,7 @@ option_help * createGlobalOptions(IOR_param_t * params){
     {'A', NULL,        "refNum -- user supplied reference number to include in the summary", OPTION_OPTIONAL_ARGUMENT, 'd', & params->referenceNumber},
     {'b', NULL,        "blockSize -- contiguous bytes to write per task  (e.g.: 8, 4k, 2m, 1g)", OPTION_OPTIONAL_ARGUMENT, 'l', & params->blockSize},
     {'c', NULL,        "collective -- collective I/O", OPTION_FLAG, 'd', & params->collective},
-    {'C', NULL,        "reorderTasks -- changes task ordering to n+1 ordering for readback", OPTION_FLAG, 'd', & params->reorderTasks},
+    {'C', NULL,        "reorderTasks -- changes task ordering for readback (useful to avoid client cache)", OPTION_FLAG, 'd', & params->reorderTasks},
     {'d', NULL,        "interTestDelay -- delay between reps in seconds", OPTION_OPTIONAL_ARGUMENT, 'd', & params->interTestDelay},
     {'D', NULL,        "deadlineForStonewalling -- seconds before stopping write or read phase", OPTION_OPTIONAL_ARGUMENT, 'd', & params->deadlineForStonewalling},
     {.help="  -O stoneWallingWearOut=1           -- once the stonewalling timout is over, all process finish to access the amount of data", .arg = OPTION_OPTIONAL_ARGUMENT},
diff --git a/src/utilities.c b/src/utilities.c
index 8eb4485..99d26e7 100755
--- a/src/utilities.c
+++ b/src/utilities.c
@@ -229,7 +229,7 @@ void DumpBuffer(void *buffer,
    and the value is whether that rank is on the same host as root.
    Also returns 1 if rank 1 is on same host and 0 otherwise
 */
-int QueryNodeMapping(MPI_Comm comm) {
+int QueryNodeMapping(MPI_Comm comm, int print_nodemap) {
     char localhost[MAX_PATHLEN], roothost[MAX_PATHLEN];
     int num_ranks;
     MPI_Comm_size(comm, &num_ranks);
@@ -250,7 +250,7 @@ int QueryNodeMapping(MPI_Comm comm) {
     /* then every rank figures out whether it is same host as root and then gathers that */
     int same_as_root = strcmp(roothost,localhost) == 0;
     MPI_Gather( &same_as_root, 1, MPI_INT, node_map, 1, MPI_INT, 0, comm);
-    if (rank==0) {
+    if ( print_nodemap && rank==0) {
         fprintf( out_logfile, "Nodemap: " );
         for ( int i = 0; i < num_ranks; i++ ) {
             fprintf( out_logfile, "%d", node_map[i] );
diff --git a/src/utilities.h b/src/utilities.h
index 0964169..d2c9962 100755
--- a/src/utilities.h
+++ b/src/utilities.h
@@ -56,7 +56,7 @@ void SetHints (MPI_Info *, char *);
 void ShowHints (MPI_Info *);
 char *HumanReadable(IOR_offset_t value, int base);
 int CountTasksPerNode(MPI_Comm comm);
-int QueryNodeMapping(MPI_Comm comm);
+int QueryNodeMapping(MPI_Comm comm, int print_nodemap);
 void DelaySecs(int delay);
 void updateParsedOptions(IOR_param_t * options, options_all_t * global_options);
 size_t NodeMemoryStringToBytes(char *size_str);