[HACKERS] Memory profiling in postgreSQL

[Rafaqat Ali]

Hello all .
    Can anyon eplz tell me how memory profiling is done in postgreSQL. I read on a website I don't remember now that postgres creates a file pgsql/data/base/dbname and stores memory profiling information in it. postgres creates a folder with integer name in pgsql/base/ and in that folder a binary file was when I run postmaster.
   I want to know where does postgres save memory profiling information in human readable format.
            Thanx in advanc.
                     Regards
                          Rafaqat Ali