From: Jens Axboe <jens.axboe@oracle.com>
Date: Thu, 19 Jul 2007 19:38:35 +0000 (+0200)
Subject: Default stdev to 0.0, not -1.0
X-Git-Tag: fio-1.16.9~5
X-Git-Url: https://git.kernel.dk/?p=fio.git;a=commitdiff_plain;h=4b43f54ed7dece502350658bee10eba551aeb4a4

Default stdev to 0.0, not -1.0

If we only have a single sample, then the deviation is by definition 0.

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
---

diff --git a/stat.c b/stat.c
index 28d85c18..38f94be0 100644
--- a/stat.c
+++ b/stat.c
@@ -82,7 +82,7 @@ static int calc_lat(struct io_stat *is, unsigned long *min, unsigned long *max,
 	if (n > 1.0)
 		*dev = sqrt(is->S / (n - 1.0));
 	else
-		*dev = -1.0;
+		*dev = 0;
 
 	return 1;
 }