[Swift-devel] throttle flow diagram

[Ben Clifford]

I just drew this attempt at showing where the various throttles in Swift 
are and which parameters control them.

http://www.ci.uchicago.edu/~benc/tmp/throttle-flow.jpeg

Comments both on the technical content (which throttles are where) and on 
the best layout to draw this diagram are welcome.

Eventually I'll draw it using some kind of computer program and put it in 
the user guide.

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