How to Scale Multiple Processes in a Cluster?

Salery provides concurrency by preorking, so you'd have multiple processes. You can also use giavento rventlet, which may task execution ar incronis using sockets. And if this is your use case and you're mostly io bound, i suggest starting multiple celary processes in one cluster that consume from the same a message broker. That way you'd be able to run yod, be able to deliver hundreds of thousands of emals per second.