--version Print version info and exit
--help Print this page
--cpuclock-test Perform test/validation of CPU clock
+ --crctest[=test] Test speed of checksum functions
--cmdhelp=cmd Print command help, "all" for all of them
--enghelp=engine Print ioengine help, or list available ioengines
--enghelp=engine,cmd Print help for an ioengine cmd