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[PATCH] Fix standard deviation calculation
author
Jens Axboe
<jens.axboe@oracle.com>
Wed, 10 Jan 2007 14:39:51 +0000
(15:39 +0100)
committer
Jens Axboe
<jens.axboe@oracle.com>
Wed, 10 Jan 2007 14:39:51 +0000
(15:39 +0100)
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
stat.c
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diff --git
a/stat.c
b/stat.c
index a84f28a58edf4069091bccf25ffc9801426ce3fb..6e7c23570bf88836e8b1911aa7719c1a1e8581ef 100644
(file)
--- a/
stat.c
+++ b/
stat.c
@@
-298,11
+298,11
@@
static int calc_lat(struct io_stat *is, unsigned long *min, unsigned long *max,
if (n <= 1.0)
return 1;
- o = (
double) is->val_sq - ((*mean * *mean) / n)
;
+ o = (
(double) is->val_sq - (*mean * is->val)) / n
;
if (o < 0.0)
*dev = -1.0;
else
- *dev = sqrt(o
/ (n - 1.0)
);
+ *dev = sqrt(o);
return 1;
}