Re:Node.js has jumped the shark
by jshen on Tuesday October 04, 2011 @05:13PM
(#3072945)
No, heroku doesn't work that way, heroku lets you spin up processes and those processes can be threaded. I use JRuby and get one process that can use all cores.
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I think it's safe to say that typical Ruby deployments (as I qualified) are not using JRuby, especially not those on Heroku. Thus, even if the process spawns threads, they will be limited to one core at a time.
Whether JRuby's threads are actually running on multiple cores simultaneously depends on what mode Heroku is running the JVM in.