Merge branch 'evelu-fiog' of https://github.com/ErwanAliasr1/fio

[fio.git] / lib / zipf.c

diff --git a/lib/zipf.c b/lib/zipf.c
index 321a4fb9645e8995e1145758ec75530aeea75a16..14d7928f664a0dfadf8d005e5c87414407cc91fa 100644 (file)
--- a/lib/zipf.c
+++ b/lib/zipf.c
@@ -23,19 +23,21 @@ static void zipf_update(struct zipf_state *zs)
 }
 
 static void shared_rand_init(struct zipf_state *zs, uint64_t nranges,
-                            unsigned int seed)
+                            double center, unsigned int seed)
 {
        memset(zs, 0, sizeof(*zs));
        zs->nranges = nranges;
 
        init_rand_seed(&zs->rand, seed, 0);
        zs->rand_off = __rand(&zs->rand);
+       if (center != -1)
+               zs->rand_off = nranges * center;
 }
 
 void zipf_init(struct zipf_state *zs, uint64_t nranges, double theta,
-              unsigned int seed)
+              double center, unsigned int seed)
 {
-       shared_rand_init(zs, nranges, seed);
+       shared_rand_init(zs, nranges, center, seed);
 
        zs->theta = theta;
        zs->zeta2 = pow(1.0, zs->theta) + pow(0.5, zs->theta);
@@ -71,9 +73,9 @@ uint64_t zipf_next(struct zipf_state *zs)
 }
 
 void pareto_init(struct zipf_state *zs, uint64_t nranges, double h,
-                unsigned int seed)
+                double center, unsigned int seed)
 {
-       shared_rand_init(zs, nranges, seed);
+       shared_rand_init(zs, nranges, center, seed);
        zs->pareto_pow = log(h) / log(1.0 - h);
 }