That is a highly variable "it depends". On a 4 core IBM Blade, I let CF have 25 max CF/JRun threads to play with. Even then, things would just bomb out to hell if the database puked and started refusing connections (3 different database servers, several instances on each to handle database requests depending on where the data lived). If you've not checked out FusionReactor or SeeFusion, it's helpful in finding out where the breaking point is.
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