From 4e98a45014737dc4f35d0ca599e4d1ccb4ef3c9b Mon Sep 17 00:00:00 2001 From: Jens Axboe Date: Thu, 15 Nov 2012 15:19:34 -0700 Subject: [PATCH] genzipf: add help/usage screen (-h) Signed-off-by: Jens Axboe --- t/genzipf.c | 18 +++++++++++++++++- 1 file changed, 17 insertions(+), 1 deletion(-) diff --git a/t/genzipf.c b/t/genzipf.c index 3cc93e6d..c5f098c4 100644 --- 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; -- 2.25.1