[rabbitmq-discuss] Performance of One vs. Many Topic Exchanges

[Chris]

I am implementing an abstraction over dynamic pub/sub.  The idea is that
you have named "themes", and within those themes you have "subjects" that
can be used as a filter.  Themes may or may not be transient.

I think have two choices:

1) Each named "theme" is a separate topic exchange and "subjects" map
directly to routing keys *(i.e., "stocks" topic exchange, with messages
having routing keys like "nasdaq.apple.price")*.

2) There is a single topic exchange and the routing key is a composite of
theme and subject *(i.e., "themes" topic exchange, with messages having
routing keys like "theme.stocks.subject.nasdaq.apple.price")*.

Although #1 has a better one-to-one mapping to my problem, I am inclined to
go with #2 because it is much easier to manage (a single exchange that
never gets deleted, vs many exchanges that I must manage the lifecycle of).

The only thing I am unsure of is if there is any difference in performance?
 Multiple exchanges are more expensive in memory, but will a single
exchange need more CPU to route messages because it is dealing with so many
more disparate bindings?

Thanks for any guidance.
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