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There are 3 types of rvmrc files: system, user, and project.
The system rvmrc file is loaded before RVM initializes and before the user's ~/.rvmrc. /etc/rvmrc settings are applied to all users on the system.
The users rvmrc file overwrites settings in /etc/rvmrc and is loaded before RVM initializes. $HOME/.rvmrc settings are applied only for the user belonging to $HOME.
Have RVM install rubies when used instead of only displaying a warning and exiting.
Have RVM compile using say, 3, compile threads (note that rvm uses all CPU threads by default).
rvm_make_flags=( -j 3 )
Have RVM install to a different location (notice that it ends with /rvm).
Have RVM compile rubies and libraries as x86_64 on *Mac OS X*.
Similarly for i386 on *Mac OS X*.
More examples may be found in ~/.rvm/examples/rvmrc.
The project .rvmrc file is different than the system & user. System & user rvmrc files are meant for altering the settings and behavior of RVM as a whole. The project rvmrc files are intended to be used to setup your project's ruby environment when you switch to the project root directory.
As of RVM 1.8.0, after a survey where greater than 80% of respondants wanted the feature on by default, automatic loading of project .rvmrc files is opt-out by default (therefore on). In order to disable this feature, set the following value in either /etc/rvmrc or ~/.rvmrc:
As of 1.11.0 RVM supports multiple files to configure project, more details here: Project workflow