``serialize_overlap`` tells fio to avoid provoking this behavior by explicitly
serializing in-flight I/Os that have a non-zero overlap. Note that setting
this option can reduce both performance and the :option:`iodepth` achieved.
- Additionally this option does not work when :option:`io_submit_mode` is set to
- offload. Default: false.
+
+ This option only applies to I/Os issued for a single job except when it is
+ enabled along with :option:`io_submit_mode`=offload. In offload mode, fio
+ will check for overlap among all I/Os submitted by offload jobs with :option:`serialize_overlap`
+ enabled. Threads must be used for all such jobs.
+
+ Default: false.
.. option:: io_submit_mode=str
.. option:: replay_align=int
- Force alignment of I/O offsets and lengths in a trace to this power of 2
- value.
+ Force alignment of the byte offsets in a trace to this value. The value
+ must be a power of 2.
.. option:: replay_scale=int
- Scale sector offsets down by this factor when replaying traces.
+ Scale byte offsets down by this factor when replaying traces. Should most
+ likely use :option:`replay_align` as well.
.. option:: replay_skip=str
data from the rolling collection window. Threshold limits can be expressed
as a fixed value or as a percentage of the mean in the collection window.
+ When using this feature, most jobs should include the :option:`time_based`
+ and :option:`runtime` options or the :option:`loops` option so that fio does not
+ stop running after it has covered the full size of the specified file(s) or device(s).
+
**iops**
Collect IOPS data. Stop the job if all individual IOPS measurements
are within the specified limit of the mean IOPS (e.g., ``iops:2``