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Taking this so it doesn't get lost in the void. +darin FYI since we just discussed this recently and +yzshen for a bindings perspective

It's not clear if we need/want vector IO now, but something to think about.

+yzshen for real

It seems to be a nice idea to explore.

Currently our serialization code calculates size for a message before serialization. Comparing with the approach of growing-buffer-when-needed, this approach avoids copying data between buffers when growing the buffer, but it comes with the cost of walking the entire data structure to calculate size. 

With scatter-gather support (exposed by the mojo system API), we will be able to have the best of both approaches.

I've done some investigation into this. Unfortunately on Windows we would be forced to issue multiple Write/ReadFile calls per message as there appears to be no scatter-gather mechanism for named pipes. We'll probably get more mileage out of other optimization efforts first.

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