Read your email you get when your account is signed up. Seriously, you get a TON of information from Dreamhost when you activate your account.
If you connect to your server via SSH, you'll also see the server name after you log in.
Lankershim is my host - most of the day it's had an average load of >20, sometimes as high as 30. This is insane.
I'm glad to see it now running at 4.9... but seriously, it was thrashed last night, and again today.