init: seed repeatable jobs differently

Factor in the job number for the stock random seeds, so we don't
generate the same patterns for identical jobs.

Signed-off-by: Jens Axboe <axboe@fb.com>

diff --git a/init.c b/init.c
index 9052addc9c7ff2117e557ad74ca5f90096f5e139..cc33bf06d60dd2c340dcfaa2410cc325cd4db446 100644 (file)
--- a/init.c
+++ b/init.c
@@ -1079,7 +1079,7 @@ static int setup_random_seeds(struct thread_data *td)
                seed *= 0x9e370001UL;
 
        for (i = 0; i < FIO_RAND_NR_OFFS; i++) {
-               td->rand_seeds[i] = seed;
+               td->rand_seeds[i] = seed * td->thread_number + i;
                seed *= 0x9e370001UL;
        }