On 10/16/2018 11:29 AM, Jens Axboe wrote: > On 10/16/18 9:26 AM, vincentfu@xxxxxxxxx wrote: >> From: Vincent Fu <vincent.fu@xxxxxxx> >> >> serialize_overlap combined with io_submit_mode=offload requires >> threads. Print a warning and force the use of threads if the user >> did not specify threads. > Why does it require threads? Is it because of the use of a pthread > mutex? If so, that should just be a fio mutex instead, and you would > not have this restrictions (on most platforms, at least). > It requires threads because io_u's are not allocated from the shared memory area. Jobs need to access each other's io_u's to check for overlap.
