gdb debugging with postgres

hi ,

I am trying to attach a postgres process to gdb, Since I am using only 1
client , I am using the script give by Tom Lane posted in the mailing list.

http://www.postgresql.org/message-id/bd6a35510707221030p694cd515kfeb529078557ba42@mail.gmail.com

I started running the client by following command *psql test *where test is
my database.

But When I am running that script I am getting two client processes.

ravi 13368 13366 0 15:14 ? 00:00:00 postgres: checkpointer
process
ravi 13379 13366 0 15:14 ? 00:00:00 postgres: ravi test [local]
idle

Could any one tell me what is checkpointer process and is there any way of
running the script without that process.

Thank you,
K.Ravikiran