diff -aruN a/memtester.c b/memtester.c
--- a/memtester.c	2017-04-13 12:13:53.101455795 -0700
+++ b/memtester.c	2017-04-13 12:21:38.423324655 -0700
@@ -100,7 +100,9 @@
 
 /* Function definitions */
 void usage(char *me) {
-    fprintf(stderr, "\nUsage: %s [-p physaddrbase] <mem>[B|K|M|G] [loops]\n", me);
+    fprintf(stderr, "\nUsage: %s [-e] [-p physaddrbase] <mem>[B|K|M|G] [loops]\n", me);
+    fprintf(stderr, "Arguments:\n");
+    fprintf(stderr, "  -e    Exit on error.\n");
     exit(EXIT_FAIL_NONSTARTER);
 }
 
@@ -113,6 +115,7 @@
     void volatile *buf, *aligned;
     ulv *bufa, *bufb;
     int do_mlock = 1, done_mem = 0;
+    int exit_on_err = 0;
     int exit_code = 0;
     int memfd, opt, memshift;
     size_t maxbytes = -1; /* addressable memory, in bytes */
@@ -127,7 +130,7 @@
     pagesizemask = (ptrdiff_t) ~(pagesize - 1);
     printf("pagesizemask is 0x%tx\n", pagesizemask);
 
-    while ((opt = getopt(argc, argv, "p:")) != -1) {
+    while ((opt = getopt(argc, argv, "ep:")) != -1) {
         switch (opt) {
             case 'p':
                 errno = 0;
@@ -154,6 +157,9 @@
                 /* okay, got address */
                 use_phys = 1;
                 break;
+            case 'e':
+                exit_on_err = 1;
+                break;
             default: /* '?' */
                 usage(argv[0]); /* doesn't return */
         }
@@ -322,6 +328,7 @@
         if (!test_stuck_address(aligned, bufsize / sizeof(ul))) {
              printf("ok\n");
         } else {
+            printf("fail\n");
             exit_code |= EXIT_FAIL_ADDRESSLINES;
         }
         for (i=0;;i++) {
@@ -330,12 +337,16 @@
             if (!tests[i].fp(bufa, bufb, count)) {
                 printf("ok\n");
             } else {
+                printf("fail\n");
                 exit_code |= EXIT_FAIL_OTHERTEST;
             }
             fflush(stdout);
         }
         printf("\n");
         fflush(stdout);
+        if (exit_on_err && (exit_code != 0)) {
+            break;
+        }
     }
     if (do_mlock) munlock((void *) aligned, bufsize);
     printf("Done.\n");