size=x Set file size to x bytes (x string can include k/m/g)
ioengine=x 'x' may be: aio/libaio/linuxaio for Linux aio,
posixaio for POSIX aio, solarisaio for Solaris
- native async IO, sync for regular read/write io,
+ native async IO, windowsaio for Windows native async IO,
+ sync for regular read/write io,
psync for regular pread/pwrite io, vsync for regular
readv/writev (with queuing emulation) mmap for mmap'ed
io, syslet-rw for syslet driven read/write, splice for