Use unique seed for zipf/pareto init if rand_repeat is not set

[fio.git] / filesetup.c

diff --git a/filesetup.c b/filesetup.c
index 9679c88d28245f287d64f13092a72631f7121fca..c488eb471caa8a2d442c8cf58a1c203ff18309e7 100644 (file)
--- a/filesetup.c
+++ b/filesetup.c
@@ -12,6 +12,7 @@
 #include "smalloc.h"
 #include "filehash.h"
 #include "os/os.h"
+#include "hash.h"
 
 #ifdef FIO_HAVE_LINUX_FALLOCATE
 #include <linux/falloc.h>
@@ -862,12 +863,53 @@ int pre_read_files(struct thread_data *td)
        return 1;
 }
 
+static int __init_rand_distribution(struct thread_data *td, struct fio_file *f)
+{
+       unsigned int range_size, seed;
+       unsigned long nranges;
+
+       range_size = min(td->o.min_bs[DDIR_READ], td->o.min_bs[DDIR_WRITE]);
+
+       nranges = (f->real_file_size + range_size - 1) / range_size;
+
+       seed = jhash(f->file_name, strlen(f->file_name), 0) * td->thread_number;
+       if (!td->o.rand_repeatable)
+               seed = td->rand_seeds[4];
+
+       if (td->o.random_distribution == FIO_RAND_DIST_ZIPF)
+               zipf_init(&f->zipf, nranges, td->o.zipf_theta, seed);
+       else
+               pareto_init(&f->zipf, nranges, td->o.pareto_h, seed);
+
+       return 1;
+}
+
+static int init_rand_distribution(struct thread_data *td)
+{
+       struct fio_file *f;
+       unsigned int i;
+       int state;
+
+       if (td->o.random_distribution == FIO_RAND_DIST_RANDOM)
+               return 0;
+
+       state = td->runstate;
+       td_set_runstate(td, TD_SETTING_UP);
+       for_each_file(td, f, i)
+               __init_rand_distribution(td, f);
+       td_set_runstate(td, state);
+
+       return 1;
+}
+
 int init_random_map(struct thread_data *td)
 {
        unsigned long long blocks, num_maps;
        struct fio_file *f;
        unsigned int i;
 
+       if (init_rand_distribution(td))
+               return 0;
        if (td->o.norandommap || !td_random(td))
                return 0;