As the names depend on the tests' file names, it is safe to
run the tests with this option in parallel.
+--root=<dir>::
+ This runs the testsuites specified under a seperate directory.
+ However, caution is advised, as not all tests are maintained
+ with this relocation in mind, so some tests may behave
+ differently.
+
+ Pointing this argument at a tmpfs filesystem can improve the
+ speed of the test suite for some users.
+
When invoking the test suite via "make test" any of the above options
can be specified as follows: