Memory usage in more than 1 instance

Hi,
We have 2 instances on linux, RAM is 16GB. SGA_MAX_SIZE is 3 GB each instance and kernel parameter shmmax is set to 8GB.
Now i wanted to know that how oracle calculates the memory in the server. Is it calculates (3gb+3gb=6gb) or (3gb) only.
If possible then please provide any doc. link.
Thanx

Each instance has its own memory that is never shared with any other instance.
Oracle instance memory is always SGA and PGA.
See Concepts Guide for more info: http://download.oracle.com/docs/cd/E11882_01/server.112/e10713/memory.htm#i12483

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