docs: update cmdprio_percentage with note about root user

[fio.git] / lib / gauss.c

diff --git a/lib/gauss.c b/lib/gauss.c
index afd0490d54786130acf04e0bb3c64bd8a4473bbd..3f84dbc6d04c802831c6ae5e9585b4736144b04c 100644 (file)
--- a/lib/gauss.c
+++ b/lib/gauss.c
@@ -1,6 +1,5 @@
 #include <math.h>
 #include <string.h>
-#include <stdio.h>
 #include "../hash.h"
 #include "gauss.h"
 
@@ -38,7 +37,10 @@ unsigned long long gauss_next(struct gauss_state *gs)
                sum += dev;
        }
 
-       return __hash_u64(sum) % gs->nranges;
+       if (!gs->disable_hash)
+               sum = __hash_u64(sum);
+
+       return sum % gs->nranges;
 }
 
 void gauss_init(struct gauss_state *gs, unsigned long nranges, double dev,
@@ -49,8 +51,13 @@ void gauss_init(struct gauss_state *gs, unsigned long nranges, double dev,
        gs->nranges = nranges;
 
        if (dev != 0.0) {
-               gs->stddev = ceil((double) (nranges * 100.0) / dev);
+               gs->stddev = ceil((double)(nranges * dev) / 100.0);
                if (gs->stddev > nranges / 2)
                        gs->stddev = nranges / 2;
        }
 }
+
+void gauss_disable_hash(struct gauss_state *gs)
+{
+       gs->disable_hash = true;
+}