Discourse is awesome for sharing thoughts and paving ways.
However, I believe some smaller angles of ruby-bench would go faster with instant discussion.
A specific architectural point, or just to say someone is working on something in specific for example.
That's why I just registered the ##ruby-bench channel on freenode.
Feel free to join.
@sam: right now, I'm the only one with admin access on that room.
Let me know your freenode username and I'll add you.