There's a closed pull request on the mblaze repository

mthread: hide message count behind -n
https://github.com/leahneukirchen/mblaze/pull/174

Description:
See also: ddd7e54fbbf6747ccefabbbad0087debcaec2ca5

It would probably be preferable to use the same flag as used by mscan
(i.e. `-v`). Unfortunately, mthread uses the `-v` flag for another purpose
already.