[PATCH] 'null' ioengine
Add a null io engine, which can be used to exercise and test/debug fio
itself. It doesn't transfer any data, just pretends to.
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
diff --git a/HOWTO b/HOWTO
index 1176d22..a5caea3 100644
--- a/HOWTO
+++ b/HOWTO
@@ -264,6 +264,10 @@
we use read(2) and write(2) for asynchronous
io.
+ null Doesn't transfer any data, just pretends
+ to. This is mainly used to exercise fio
+ itself and for debugging/testing purposes.
+
iodepth=int This defines how many io units to keep in flight against
the file. The default is 1 for each file defined in this
job, can be overridden with a larger value for higher