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posixaio engine: residual data count
[fio.git]
/
HOWTO
diff --git
a/HOWTO
b/HOWTO
index 237b3ad23879efea84dbe46c69bd6754dc932f1d..06408e40e16a91fadeea2dce399efc444845b6e5 100644
(file)
--- a/
HOWTO
+++ b/
HOWTO
@@
-253,6
+253,14
@@
bs_unaligned If this option is given, any byte size value within bsrange
nrfiles=int Number of files to use for this job. Defaults to 1.
nrfiles=int Number of files to use for this job. Defaults to 1.
+file_service_type=str Defines how fio decides which file from a job to
+ service next. The following types are defined:
+
+ random Just choose a file at random.
+
+ roundrobin Round robin over open files. This
+ is the default.
+
ioengine=str Defines how the job issues io to the file. The following
types are defined:
ioengine=str Defines how the job issues io to the file. The following
types are defined:
@@
-289,11
+297,20
@@
ioengine=str Defines how the job issues io to the file. The following
or receive, if the latter only the port
argument is used.
or receive, if the latter only the port
argument is used.
+ external Prefix to specify loading an external
+ IO engine object file. Append the engine
+ filename, eg ioengine=external:/tmp/foo.o
+ to load ioengine foo.o in /tmp.
+
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
concurrency.
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
concurrency.
+iodepth_batch=int This defines how many pieces of IO to submit at once.
+ It defaults to the same as iodepth, but can be set lower
+ if one so desires.
+
iodepth_low=int The low water mark indicating when to start filling
the queue again. Defaults to the same as iodepth, meaning
that fio will attempt to keep the queue full at all times.
iodepth_low=int The low water mark indicating when to start filling
the queue again. Defaults to the same as iodepth, meaning
that fio will attempt to keep the queue full at all times.