Fixup t/ test apps for lfsr_next change()

[fio.git] / t / genzipf.c

diff --git a/t/genzipf.c b/t/genzipf.c
index 3cc93e6d7f080624a3749df162f7aaefc50908ef..c5f098c4c606eceb26072048fa398cfb31bfedda 100644 (file)
--- a/t/genzipf.c
+++ b/t/genzipf.c
@@ -78,13 +78,29 @@ static struct node *hash_insert(struct node *n, unsigned long long val)
        return n;
 }
 
+static void usage(void)
+{
+       printf("genzipf: test zipf/pareto values for fio input\n");
+       printf("\t-h\tThis help screen\n");
+       printf("\t-p\tGenerate size of data set that are hit by this percentage\n");
+       printf("\t-t\tDistribution type (zipf or pareto)\n");
+       printf("\t-i\tDistribution algorithm input (zipf theta or pareto power)\n");
+       printf("\t-b\tBlock size of a given range (in bytes)\n");
+       printf("\t-g\tSize of data set (in gigabytes)\n");
+       printf("\t-o\tNumber of output columns\n");
+       printf("\t-c\tOutput ranges in CSV format\n");
+}
+
 static int parse_options(int argc, char *argv[])
 {
-       const char *optstring = "t:g:i:o:b:p:c";
+       const char *optstring = "t:g:i:o:b:p:ch";
        int c, dist_val_set = 0;
 
        while ((c = getopt(argc, argv, optstring)) != -1) {
                switch (c) {
+               case 'h':
+                       usage();
+                       return 1;
                case 'p':
                        percentage = atof(optarg);
                        break;