+ iolog=x Open and read io pattern from file 'x'. The file must
+ contain one io action per line in the following format:
+ rw, offset, length
+ where with rw=0/1 for read/write, and the offset
+ and length entries being in bytes.
+ write_iolog=x Write an iolog to file 'x' in the same format as iolog.
+ The iolog options are exclusive, if both given the
+ read iolog will be performed.
+ lockmem=x Lock down x amount of memory on the machine, to
+ simulate a machine with less memory available. x can
+ include k/m/g suffix.
+ nice=x Run job at given nice value.
+ exec_prerun=x Run 'x' before job io is begun.
+ exec_postrun=x Run 'x' after job io has finished.