$ fio --read_iolog="<file1>:<file2>" --merge_blktrace_file="<output_file>"
Creating only the merged file can be done by passing the command line argument
-:option:`merge-blktrace-only`.
+:option:`--merge-blktrace-only`.
Scaling traces can be done to see the relative impact of any particular trace
being slowed down or sped up. :option:`merge_blktrace_scalars` takes in a colon