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Revert README and HOWTO files renaming.
[fio.git]
/
lib
/
zipf.c
diff --git
a/lib/zipf.c
b/lib/zipf.c
index 9b6ce6334836baa1f0f3c0c238da24f319ad4c3b..681df70069ac27419b4545dcbac0ee2de81fdbee 100644
(file)
--- a/
lib/zipf.c
+++ b/
lib/zipf.c
@@
-11,7
+11,7
@@
#include "../minmax.h"
#include "../hash.h"
#include "../minmax.h"
#include "../hash.h"
-#define ZIPF_MAX_GEN 10000000
+#define ZIPF_MAX_GEN 10000000
UL
static void zipf_update(struct zipf_state *zs)
{
static void zipf_update(struct zipf_state *zs)
{
@@
-23,7
+23,7
@@
static void zipf_update(struct zipf_state *zs)
* 10M max, that should be doable in 1-2s on even slow machines.
* Precision will take a slight hit, but nothing major.
*/
* 10M max, that should be doable in 1-2s on even slow machines.
* Precision will take a slight hit, but nothing major.
*/
- to_gen = min(zs->nranges, ZIPF_MAX_GEN);
+ to_gen = min(zs->nranges,
(uint64_t)
ZIPF_MAX_GEN);
for (i = 0; i < to_gen; i++)
zs->zetan += pow(1.0 / (double) (i + 1), zs->theta);
for (i = 0; i < to_gen; i++)
zs->zetan += pow(1.0 / (double) (i + 1), zs->theta);
@@
-35,7
+35,7
@@
static void shared_rand_init(struct zipf_state *zs, unsigned long nranges,
memset(zs, 0, sizeof(*zs));
zs->nranges = nranges;
memset(zs, 0, sizeof(*zs));
zs->nranges = nranges;
- init_rand_seed(&zs->rand, seed);
+ init_rand_seed(&zs->rand, seed
, 0
);
zs->rand_off = __rand(&zs->rand);
}
zs->rand_off = __rand(&zs->rand);
}
@@
-59,7
+59,7
@@
unsigned long long zipf_next(struct zipf_state *zs)
alpha = 1.0 / (1.0 - zs->theta);
eta = (1.0 - pow(2.0 / n, 1.0 - zs->theta)) / (1.0 - zs->zeta2 / zs->zetan);
alpha = 1.0 / (1.0 - zs->theta);
eta = (1.0 - pow(2.0 / n, 1.0 - zs->theta)) / (1.0 - zs->zeta2 / zs->zetan);
- rand_uni = (double) __rand(&zs->rand) / (double) FRAND_MAX;
+ rand_uni = (double) __rand(&zs->rand) / (double) FRAND
32
_MAX;
rand_z = rand_uni * zs->zetan;
if (rand_z < 1.0)
rand_z = rand_uni * zs->zetan;
if (rand_z < 1.0)
@@
-69,7
+69,12
@@
unsigned long long zipf_next(struct zipf_state *zs)
else
val = 1 + (unsigned long long)(n * pow(eta*rand_uni - eta + 1.0, alpha));
else
val = 1 + (unsigned long long)(n * pow(eta*rand_uni - eta + 1.0, alpha));
- return (__hash_u64(val - 1) + zs->rand_off) % zs->nranges;
+ val--;
+
+ if (!zs->disable_hash)
+ val = __hash_u64(val);
+
+ return (val + zs->rand_off) % zs->nranges;
}
void pareto_init(struct zipf_state *zs, unsigned long nranges, double h,
}
void pareto_init(struct zipf_state *zs, unsigned long nranges, double h,
@@
-81,8
+86,18
@@
void pareto_init(struct zipf_state *zs, unsigned long nranges, double h,
unsigned long long pareto_next(struct zipf_state *zs)
{
unsigned long long pareto_next(struct zipf_state *zs)
{
- double rand = (double) __rand(&zs->rand) / (double) FRAND_MAX;
- unsigned long long n = zs->nranges - 1;
+ double rand = (double) __rand(&zs->rand) / (double) FRAND32_MAX;
+ unsigned long long n;
+
+ n = (zs->nranges - 1) * pow(rand, zs->pareto_pow);
+
+ if (!zs->disable_hash)
+ n = __hash_u64(n);
- return (__hash_u64(n * pow(rand, zs->pareto_pow)) + zs->rand_off) % zs->nranges;
+ return (n + zs->rand_off) % zs->nranges;
+}
+
+void zipf_disable_hash(struct zipf_state *zs)
+{
+ zs->disable_hash = true;
}
}