The following changes since commit 5efce23f88563bc08f64e122297fcfbea32fdd4f:
Escape minus signs in manpage to fix lintian warning: (2011-10-05 14:09:15 +0200)
are available in the git repository at:
git://git.kernel.dk/fio.git master
Jens Axboe (1):
Fix bad random offset generation for file map
io_u.c | 14 +++++++-------
1 files changed, 7 insertions(+), 7 deletions(-)
---
Diff of recent changes:
diff --git a/io_u.c b/io_u.c
index 0bc83d2..4dcb1fc 100644
--- a/io_u.c
+++ b/io_u.c
@@ -158,7 +158,7 @@ static int get_next_free_block(struct thread_data *td, struct fio_file *f,
static int get_next_rand_offset(struct thread_data *td, struct fio_file *f,
enum fio_ddir ddir, unsigned long long *b)
{
- unsigned long long r, lastb;
+ unsigned long long rmax, r, lastb;
int loops = 5;
lastb = last_block(td, f, ddir);
@@ -168,14 +168,14 @@ static int get_next_rand_offset(struct thread_data *td, struct fio_file *f,
if (f->failed_rands >= 200)
goto ffz;
+ rmax = td->o.use_os_rand ? OS_RAND_MAX : FRAND_MAX;
do {
- if (td->o.use_os_rand) {
+ if (td->o.use_os_rand)
r = os_random_long(&td->random_state);
- *b = (lastb - 1) * (r / ((unsigned long long) OS_RAND_MAX + 1.0));
- } else {
+ else
r = __rand(&td->__random_state);
- *b = (lastb - 1) * (r / ((unsigned long long) FRAND_MAX + 1.0));
- }
+
+ *b = (lastb - 1) * (r / ((unsigned long long) rmax + 1.0));
dprint(FD_RANDOM, "off rand %llu\n", r);
@@ -207,7 +207,7 @@ static int get_next_rand_offset(struct thread_data *td, struct fio_file *f,
loops = 10;
do {
f->last_free_lookup = (f->num_maps - 1) *
- (r / (OS_RAND_MAX + 1.0));
+ (r / ((unsigned long long) rmax + 1.0));
if (!get_next_free_block(td, f, ddir, b))
goto ret;
--
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