Huge Pages - setting the right value

Hi,
I'm currently testing performance with and without huge pages. Documentation
says that in order to estimate the number of huge pages needed one should
check the postmaster's VmPeak value. I wonder if it's only postmaster memory
usage what's matters? Or I could get better estimation from the most memory
intensive postgres process - not necessarly postmaster? I'm using following
command to check it:
for i in $(ps -ef | grep postgres|awk '{print $2}'); do grep ^VmPeak
/proc/${i}/status|awk '{print $2}' >> log; done; sort -n -r log | head -1

I'm asking because some other process takes 606788kB while postmaster only
280444kB.

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