debugger question

Hello:

I am brand new to Postgresql.

I ran the following commands.
./configure
gmake
su
gmake install
adduser postgres
mkdir /usr/local/pgsql/data
chown postgres /usr/local/pgsql/data
su - postgres
/usr/local/pgsql/bin/initdb -D /usr/local/pgsql/data
/usr/local/pgsql/bin/postmaster -D /usr/local/pgsql/data >logfile 2>&1 &
/usr/local/pgsql/bin/createdb test
/usr/local/pgsql/bin/psql test

I would like to start using gdb.

What is the simplest way of doing this? I read the instructions
on this page

http://sites.google.com/a/cs.berkeley.edu/cs186-fa09/home/assignments/assignment2/pggdb

, but this is what I get.

gdb) attach 1731
Attaching to program: /usr/local/pgsql/bin/postgres, process 1731
ptrace: Operation not permitted.
(gdb) break cost_seqscan
Breakpoint 1 at 0x81cdf97: file costsize.c, line 163.
(gdb) c
The program is not being run.

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Please help.

Thanks.

MMK.

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