cached - any tools to explain what has been cached on linux

[tleslie]

I set up a machine with postgres,
and a 16GB of RAM and its really quick as compared to
a similar machine running postgres with similar DB
and only 3GB RAM.

Does anyone know of any utils or profiling tools
that would explain what the cache in linux
is doing?

TOP: 

Mem:  16440144k total, 12889668k used,  3550476k free,    69076k buffers
Swap:  2104472k total,    10732k used,  2093740k free, 10203404k cached

i'd love to know how/what is in that 10 GB of cache

i know it stores allocation blocks for programs to use, but its
got to be so much more then that.

-tl

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