achieving higher concurrency and thus throughput than is possible
via kernel NFS.
+ **exec**
+ Execute 3rd party tools. Could be used to perform monitoring during jobs runtime.
+
I/O engine specific parameters
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
URL in libnfs format, eg nfs://<server|ipv4|ipv6>/path[?arg=val[&arg=val]*]
Refer to the libnfs README for more details.
+.. option:: program=str : [exec]
+
+ Specify the program to execute.
+
+.. option:: arguments=str : [exec]
+
+ Specify arguments to pass to program.
+ Some special variables can be expanded to pass fio's job details to the program.
+
+ **%r**
+ Replaced by the duration of the job in seconds.
+ **%n**
+ Replaced by the name of the job.
+
+.. option:: grace_time=int : [exec]
+
+ Specify the time between the SIGTERM and SIGKILL signals. Default is 1 second.
+
+.. option:: std_redirect=boot : [exec]
+
+ If set, stdout and stderr streams are redirected to files named from the job name. Default is true.
+
I/O depth
~~~~~~~~~