JBoss App Server Sizing

[gagangandhi]

Hi,
Is there a guide or a high level guideline to do the Sizing of a JBoss application server?
I understand there can hardly be any thumb rule for sizing - but if there is something that gives an approximate idea of the resource requirement (CPU/Memory) on a per user or per request basis - that would help.
Can someone pls provide links to case studies etc with details of the server size used and the load volume handled by the application?

Thanks in anticipation

[germanbalbastro]

Do you find any guide for sizing of a JBoss application server?
I need one!!
Thanks a lot