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A comment on Salvatore Sanfilippo talks Redis design and internals.

Re:Salvatore Sanfilippo talks Redis design and internals by SebMueller on Tuesday January 18, 2011 @03:20AM (#2115087)
How can I scale redis Pub/Sub system when I need more messages/second?
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Re:Salvatore Sanfilippo talks Redis design and internals by antirez on Tuesday January 18, 2011 @03:27AM (#2115097)
Pub/Sub is receiver-intensive, not publish-intensive, so basically if you have many subscribers the best thing you can do is to setup a few slaves.

PUBLISH commands are propagated on slaves. So you can attach your subscribers in a random slave.

Another approach is, if you don't have any pattern matching subscriber, to shard based on the hash of the key.

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