Add Intel rdrand support

[fio.git] / lib / gauss.c

diff --git a/lib/gauss.c b/lib/gauss.c
index cd8b6e3e491a8669b3d5cad6e92c80567d656acb..1bb6c41d9ab035b12ef3a3e7c7290679f472f823 100644 (file)
--- a/lib/gauss.c
+++ b/lib/gauss.c
@@ -41,13 +41,16 @@ unsigned long long gauss_next(struct gauss_state *gs)
        return __hash_u64(sum) % gs->nranges;
 }
 
-void gauss_init(struct gauss_state *gs, unsigned long nranges, unsigned int d,
+void gauss_init(struct gauss_state *gs, unsigned long nranges, double dev,
                unsigned int seed)
 {
        memset(gs, 0, sizeof(*gs));
        init_rand_seed(&gs->r, seed);
        gs->nranges = nranges;
-       gs->stddev = d;
-       if (gs->stddev > nranges / 2)
-               gs->stddev = nranges / 2;
+
+       if (dev != 0.0) {
+               gs->stddev = ceil((double) (nranges * 100.0) / dev);
+               if (gs->stddev > nranges / 2)
+                       gs->stddev = nranges / 2;
+       }
 }