Document file_service_type option

[fio.git] / HOWTO

diff --git a/HOWTO b/HOWTO
index de4b0a9932b43f207260a569a5e33349efebc63b..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:
 


@@ -289,6 +297,11 @@ 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
 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