The following changes since commit 81f3d8e9b0c7e178fc308e6416fade2756898fed:
Fio 2.2.8 (2015-05-07 18:19:25 -0600)
are available in the git repository at:
git://git.kernel.dk/fio.git master
for you to fetch changes up to 94d8288ef299b544d518da69f21a6df9a04eb086:
Merge branch 'master' of ssh://git.kernel.dk/data/git/fio (2015-05-08 09:21:17 -0600)
----------------------------------------------------------------
Jens Axboe (2):
random: document default seed value
Merge branch 'master' of ssh://git.kernel.dk/data/git/fio
HOWTO | 1 +
init.c | 10 +++-------
options.c | 1 +
3 files changed, 5 insertions(+), 7 deletions(-)
---
Diff of recent changes:
diff --git a/HOWTO b/HOWTO
index 0808cc3..d62d408 100644
--- a/HOWTO
+++ b/HOWTO
@@ -435,6 +435,7 @@ unified_rw_reporting=bool Fio normally reports statistics on a per
randrepeat=bool For random IO workloads, seed the generator in a predictable
way so that results are repeatable across repetitions.
+ Defaults to true.
randseed=int Seed the random number generators based on this seed value, to
be able to control what sequence of output is being generated.
diff --git a/init.c b/init.c
index fa50d3c..ba5bf2f 100644
--- a/init.c
+++ b/init.c
@@ -749,7 +749,7 @@ static int fixup_options(struct thread_data *td)
/*
* If randseed is set, that overrides randrepeat
*/
- if (td->o.rand_seed)
+ if (fio_option_is_set(&td->o, rand_seed))
td->o.rand_repeatable = 0;
if ((td->io_ops->flags & FIO_NOEXTEND) && td->o.file_append) {
@@ -966,14 +966,10 @@ static int setup_random_seeds(struct thread_data *td)
unsigned long seed;
unsigned int i;
- if (!td->o.rand_repeatable && !td->o.rand_seed)
+ if (!td->o.rand_repeatable && !fio_option_is_set(&td->o, rand_seed))
return init_random_state(td, td->rand_seeds, sizeof(td->rand_seeds));
- if (!td->o.rand_seed)
- seed = 0x89;
- else
- seed = td->o.rand_seed;
-
+ seed = td->o.rand_seed;
for (i = 0; i < 4; i++)
seed *= 0x9e370001UL;
diff --git a/options.c b/options.c
index f21ed26..e306b28 100644
--- a/options.c
+++ b/options.c
@@ -1845,6 +1845,7 @@ struct fio_option fio_options[FIO_MAX_OPTS] = {
.type = FIO_OPT_STR_VAL,
.off1 = td_var_offset(rand_seed),
.help = "Set the random generator seed value",
+ .def = "0x89",
.parent = "rw",
.category = FIO_OPT_C_IO,
.group = FIO_OPT_G_RANDOM,
--
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