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

By default, fio uses repeatable random sequences for anything.
This makes it easy to run the same job again. But if this is
disabled, ensure that the zipf/pareto sequences are also
randomized. Re-use the normal random io offset seed for
the random distribution too.

Signed-off-by: Jens Axboe <axboe@kernel.dk>

diff --git a/filesetup.c b/filesetup.c
index 8636e16661b3bad68a70e28a6805e227c5e9e543..c488eb471caa8a2d442c8cf58a1c203ff18309e7 100644 (file)
--- a/filesetup.c
+++ b/filesetup.c
@@ -873,6 +873,9 @@ static int __init_rand_distribution(struct thread_data *td, struct fio_file *f)
        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