diff --git a/test/API/H5_api_dataset_test.c b/test/API/H5_api_dataset_test.c
index 359c374b9c6..d3c873411c0 100644
--- a/test/API/H5_api_dataset_test.c
+++ b/test/API/H5_api_dataset_test.c
@@ -12593,11 +12593,13 @@ test_write_multi_chunk_dataset_same_shape_read(void)
     /*
      * Read every chunk in the dataset, checking the data for each one.
      */
-    printf("\n");
+    if (IS_MAIN_TEST_THREAD)
+        printf("\n");
     for (i = 0; i < data_size / chunk_size; i++) {
         size_t j, k;
 
-        printf("\r Reading chunk %zu", i);
+        if (IS_MAIN_TEST_THREAD)
+            printf("\r Reading chunk %zu", i);
 
         for (j = 0; j < DATASET_MULTI_CHUNK_WRITE_SAME_SPACE_READ_TEST_DSET_SPACE_RANK; j++) {
             if (dims[j] == chunk_dims[j])
diff --git a/test/h5test.h b/test/h5test.h
index 123dc952b73..0a4b79f7091 100644
--- a/test/h5test.h
+++ b/test/h5test.h
@@ -100,7 +100,11 @@ typedef struct thread_info_t {
 
 #ifdef H5_HAVE_MULTITHREAD
 extern pthread_key_t thread_info_key_g;
-#endif
+
+#define IS_MAIN_TEST_THREAD ((pthread_getspecific(thread_info_key_g)) && (((thread_info_t*)pthread_getspecific(thread_info_key_g))->thread_idx == 0)) 
+#else
+#define IS_MAIN_THREAD_THREAD true
+#endif /* H5_HAVE_MULTITHREAD */
 
 /*
  * Print the current location on the standard output stream.
@@ -134,68 +138,89 @@ extern pthread_key_t thread_info_key_g;
  */
 #define TESTING(WHAT)                                                                                        \
     do {                                                                                                     \
-        printf("Testing %-62s", WHAT);                                                                       \
-        fflush(stdout);                                                                                      \
+        if (IS_MAIN_TEST_THREAD) {                                                                           \
+            printf("Testing %-62s", WHAT);                                                                       \
+            fflush(stdout);                                                                                      \
+        }                                                                                                   \
         INCR_TEST_STAT(n_tests_run_g); \
     } while (0)
 #define TESTING_2(WHAT)                                                                                      \
     do {                                                                                                     \
-        printf("  Testing %-60s", WHAT);                                                                     \
-        fflush(stdout);                                                                                      \
+        if (IS_MAIN_TEST_THREAD) {                                                                           \
+            printf("  Testing %-60s", WHAT);                                                                     \
+            fflush(stdout);                                                                                      \
+        }                                                                                                   \
         INCR_TEST_STAT(n_tests_run_g);                                                                                   \
     } while (0)
 #define PASSED()                                                                                             \
     do {                                                                                                     \
-        HDputs(" PASSED");                                                                                   \
-        fflush(stdout);                                                                                      \
+        if (IS_MAIN_TEST_THREAD) {                                                                           \
+            HDputs(" PASSED");                                                                                   \
+            fflush(stdout);                                                                                      \
+        }                                                                                                  \
         INCR_TEST_STAT(n_tests_passed_g);                                                                                 \
     } while (0)
 #define H5_FAILED()                                                                                          \
     do {                                                                                                     \
-        TestErrPrintf("*FAILED*\n");                                                                                  \
-        fflush(stdout);                                                                                      \
+        if (IS_MAIN_TEST_THREAD) {                                                                           \
+            HDputs("*FAILED*");                                                                                  \
+            fflush(stdout);                                                                                      \
+        }                                                                                                  \
         INCR_TEST_STAT(n_tests_failed_g);                                                                                  \
     } while (0)
 #define H5_WARNING()                                                                                         \
     do {                                                                                                     \
-        HDputs("*WARNING*");                                                                                 \
-        fflush(stdout);                                                                                      \
+        if (IS_MAIN_TEST_THREAD) {                                                                           \
+            HDputs("*WARNING*");                                                                                 \
+            fflush(stdout);                                                                                      \
+        }                                                                                                  \
     } while (0)
 #define SKIPPED()                                                                                            \
     do {                                                                                                     \
-        HDputs(" -SKIP-");                                                                                   \
-        fflush(stdout);                                                                                      \
+        if (IS_MAIN_TEST_THREAD) {                                                                           \
+            HDputs(" -SKIP-");                                                                                   \
+            fflush(stdout);                                                                                      \
+        }                                                                                                 \
         INCR_TEST_STAT(n_tests_skipped_g);                                                                                 \
     } while (0)
 #define PUTS_ERROR(s)                                                                                        \
     do {                                                                                                     \
-        HDputs(s);                                                                                           \
-        AT();                                                                                                \
+        if (IS_MAIN_TEST_THREAD) {                                                                           \
+            HDputs(s);                                                                                           \
+            AT();                                                                                                \
+        }                                                                                                \
         goto error;                                                                                          \
     } while (0)
 #define TEST_ERROR                                                                                           \
     do {                                                                                                     \
-        H5_FAILED();                                                                                         \
-        AT();                                                                                                \
+        if (IS_MAIN_TEST_THREAD) {                                                                           \
+            H5_FAILED();                                                                                         \
+            AT();                                                                                                \
+        }                                                                                                \
         goto error;                                                                                          \
     } while (0)
 #define STACK_ERROR                                                                                          \
-    do {                                                                                                     \
-        H5Eprint2(H5E_DEFAULT, stdout);                                                                      \
+    do {                                                                                                    \
+        if (IS_MAIN_TEST_THREAD)                                                                           \
+            H5Eprint2(H5E_DEFAULT, stdout);                                                                      \
         goto error;                                                                                          \
     } while (0)
 #define FAIL_STACK_ERROR                                                                                     \
     do {                                                                                                     \
-        H5_FAILED();                                                                                         \
-        AT();                                                                                                \
-        H5Eprint2(H5E_DEFAULT, stdout);                                                                      \
+        if (IS_MAIN_TEST_THREAD) {                                                                           \
+            H5_FAILED();                                                                                         \
+            AT();                                                                                                \
+            H5Eprint2(H5E_DEFAULT, stdout);                                                                      \
+        }                                                                                                \
         goto error;                                                                                          \
     } while (0)
 #define FAIL_PUTS_ERROR(s)                                                                                   \
     do {                                                                                                     \
-        H5_FAILED();                                                                                         \
-        AT();                                                                                                \
-        HDputs(s);                                                                                           \
+        if (IS_MAIN_TEST_THREAD) {                                                                           \
+            H5_FAILED();                                                                                         \
+            AT();                                                                                                \
+            HDputs(s);                                                                                           \
+        }                                                                                                \
         goto error;                                                                                          \
     } while (0)
 /*
@@ -203,9 +228,11 @@ extern pthread_key_t thread_info_key_g;
  */
 #define TESTING_MULTIPART(WHAT)                                                                              \
     do {                                                                                                     \
-        printf("Testing %-62s", WHAT);                                                                       \
-        HDputs("");                                                                                          \
-        fflush(stdout);                                                                                      \
+        if (IS_MAIN_TEST_THREAD) {                                                                           \
+            printf("Testing %-62s", WHAT);                                                                       \
+            HDputs("");                                                                                          \
+            fflush(stdout);                                                                                      \
+        }                                                                                                 \
     } while (0)
 
 /*
@@ -242,8 +269,10 @@ extern pthread_key_t thread_info_key_g;
     } while (0)
 #define PART_TEST_ERROR(part_name)                                                                           \
     do {                                                                                                     \
-        H5_FAILED();                                                                                         \
-        AT();                                                                                                \
+        if (IS_MAIN_TEST_THREAD) {                                                                           \
+            H5_FAILED();                                                                                         \
+            AT();                                                                                                \
+        }                                                                                               \
         part_nerrors++;                                                                                      \
         goto part_##part_name##_end;                                                                         \
     } while (0)