Trace replaying

I can't figure out the right way to tell fio to replay a trace captured
with blktrace. There don't seem to be any specific examples of this in
the documentation or readily apparent on the web.

Should "fio --name=replay --read_iolog=foo" do something useful,
assuming foo is binary blktrace output? If not, what would a typical
command line for trace replaying look like?

-- 
Joshua Root,  jmr AT gelato.unsw.edu.au
http://www.gelato.unsw.edu.au