> Does anyone have any similar resources for Rails stacks?

Of course; this:

Use Something Else.

I've downvoted you for providing a worthless answer.

The poster asked for similar resources on scaling Rails up; maybe something like https://github.com/blog/117-scaling-lesson-23742 or http://axonflux.com/building-and-scaling-a-startup would have been useful.

I sincerely doubt that the top-poster has Twitter-level problems or resources. He may have a Rails site that's crapping out under load, and needs resources for optimizing both application performance and database access.

"Just move everything to Java" is a meaningless answer. It doesn't help him at all, not unless he's got a year and change to retrain/rehire his engineers and completely rebuild his application.

You should be so lucky as to have to take something to Twitter-scale.

I worry that if they went hand-rolled assembly, everyone would be jumping in that bandwagon.

Twitter is actually not that high-volume. They peak at 6000 messages/sec and average much lower (http://blog.twitter.com/2011/03/numbers.html). Meanwhile Tibco will sell you a device doing 100,000 messages/sec sustained (http://www.tibco.com/products/soa/messaging/messaging-applia...). There are plenty of people working on systems more scaley than Twitter.

That's not really a fair comparison however. There's an non-negligible difference between just crunching messages, and then distributing said 6k messages/sec into a directed graph of users. Those 6k messages/sec is just the input, the output is far greater.

That is what RV does.