diff --git a/ddm/cfg/mnttab.sh b/ddm/cfg/mnttab.sh
index ff19bea..b52cffd 100644
--- a/ddm/cfg/mnttab.sh
+++ b/ddm/cfg/mnttab.sh
@@ -3,7 +3,7 @@ for i in /etc/mnttab /etc/mtab
 do
     if [ -f $i ]
     then
-	echo '#define MNTTAB "'$i'"'
+	echo '#define PATH_MNTTAB "'$i'"'
 	exit 0
     fi
 done
diff --git a/ddm/ddm.c b/ddm/ddm.c
index d498025..f1c2513 100644
--- a/ddm/ddm.c
+++ b/ddm/ddm.c
@@ -1,5 +1,5 @@
 char ddm_c_rcs_id[] =
-    "$Id: ddm.c,v 1.5 2000-09-07 10:12:35 hjp Exp $";
+    "$Id: ddm.c,v 1.6 2001-02-21 16:02:46 hjp Exp $";
 /* 
  * ddm - disk delay monitor
  *
@@ -24,8 +24,12 @@ char ddm_c_rcs_id[] =
 #include <ant/io.h>
 #include <ant/globals.h>
 
+#include "cfg/mnttab.h"
+
+
 typedef enum { MODE_NONE, MODE_ARGS, MODE_MNTTAB, MODE_DIRFILE } modeT;
 
+
 static double gettimestamp(void) {
     struct timeval tm;
 
@@ -34,7 +38,7 @@ static double gettimestamp(void) {
 }
 
 static void usage(void) {
-    fprintf(stderr, "Usage: %s [-d dirfile | -m mnttab | directory ...  ]\n",
+    fprintf(stderr, "Usage: %s [-d dirfile | -m mnttab | directory ...  ] [-s max_sleep_time]\n",
 	    cmnd);
     exit(1);
 }
@@ -57,11 +61,14 @@ int main(int argc, char**argv) {
     int nr_dirs;
     int c;
     char *filename = NULL;
+    double maxsleeptime = 3600;
 
     cmnd = argv[0];
 
-    while ((c = getopt(argc, argv, "d:m:")) != EOF) {
+    while ((c = getopt(argc, argv, "d:m:s:")) != EOF) {
 	switch (c) {
+	    char *p;
+
 	    case 'd':
 		mode = MODE_DIRFILE;
 		filename = optarg;
@@ -70,6 +77,10 @@ int main(int argc, char**argv) {
 		mode = MODE_MNTTAB;
 		filename = optarg;
 		break;
+	    case 's':
+		maxsleeptime = strtod(optarg, &p);
+		if (p == optarg || *p) usage();
+		break;
 	    case '?':
 		usage();
 	    default:
@@ -80,7 +91,7 @@ int main(int argc, char**argv) {
     if (mode == MODE_NONE) {
 	if (optind == argc) {
 	    mode = MODE_MNTTAB;
-	    filename = MNTTAB;
+	    filename = PATH_MNTTAB;
 	} else {
 	    mode = MODE_ARGS;
 	    dirs = argv + optind;
@@ -91,6 +102,8 @@ int main(int argc, char**argv) {
     }
 
 
+    srand(time(NULL));
+
     for (;;) {
 	int i;
 	int sleeptime;
@@ -181,7 +194,7 @@ int main(int argc, char**argv) {
 
 	chdir("/");
 
-	sleeptime = rand() * 3600.0 / RAND_MAX;
+	sleeptime = rand() * maxsleeptime / RAND_MAX;
 	printtimestamp("sleeping %d seconds\n", sleeptime);
 	sleep(sleeptime);
     }
@@ -192,7 +205,12 @@ int main(int argc, char**argv) {
 
 /* 
  * $Log: ddm.c,v $
- * Revision 1.5  2000-09-07 10:12:35  hjp
+ * Revision 1.6  2001-02-21 16:02:46  hjp
+ * Added config test for mnttab again.
+ * Added option -s (max sleep time)
+ * Added script stats.sh to generate stats.
+ *
+ * Revision 1.5  2000/09/07 10:12:35  hjp
  * Added alternate ways to specify directories to be monitored.
  *
  * Revision 1.4  2000/06/04 16:33:21  hjp
diff --git a/ddm/stats.sh b/ddm/stats.sh
new file mode 100755
index 0000000..5c70cb2
--- /dev/null
+++ b/ddm/stats.sh
@@ -0,0 +1,7 @@
+#!/bin/sh
+
+# simple statistics (min, avg, max) for ddm output
+
+awk -F : '{ n[$4] ++; s[$4] += $3; if ($3 < min[$4]) min[$4] = $3; if ($3 > max[$4]) max[$4] = $3;  }
+END { for (i in n) { printf "%10.6f %10.6f %10.6f %s\n", min[i], s[i]/n[i], max[i], i } }' "$@" | sort -n +2
+