Maximum limit was considering CI statement for no of different process. Every workprocess is an operating system process which utilizes OS and hardware resources. So, you should use a fixed number of processes on an instance.This fixed limit depends on yhe kernel and system resources. There are many SAP notes which can help you in deciding how many processes you want for CI and DI.The division between these processes should be governed by operation modes.Also, a kind of system decides how many( types of processes )work processes are required. For eg. An ECC system requires more dialog than bw whereas bw reqiuires more background than XI / PI. Other than that number of CPU cores, physical and swap memory w
Ith buffers must be adequate. For more analysis refer help.sap and KBAs and OS/DB/ Products
Specific notes.
Rest all depends on your system load.
Divyanshu.