Fix off-by-one bug in CPU split mask handling
The thread number is not zero based, it starts from 1.
Signed-off-by: Jens Axboe <axboe@fb.com>
diff --git a/backend.c b/backend.c
index 12c76d8..72d9d6d 100644
--- a/backend.c
+++ b/backend.c
@@ -1279,7 +1279,7 @@
*/
if (o->cpumask_set) {
if (o->cpus_allowed_policy == FIO_CPUS_SPLIT) {
- ret = fio_cpus_split(&o->cpumask, td->thread_number);
+ ret = fio_cpus_split(&o->cpumask, td->thread_number - 1);
if (!ret) {
log_err("fio: no CPUs set\n");
log_err("fio: Try increasing number of available CPUs\n");