$ rvm disk-usage {all,archives,repos,sources,logs,packages,rubies,gemsets}
Returns the amount of disk space used by a specific set of data associated with rvm. All returns each, individually, along with the total space used.
Examples:
To find out how much space your rvm install is using, simply run:
$ rvm disk-usage all
To find out how much space only your gemsets use, run:
$ rvm disk-usage gemsets