postmaster grows

Hi.
I have a RedHat Linux 6.2 (kernel 2.2.18pre1 SMP) on Intel platform.
Postgres-7.0.3-2 (RPM).
It grows. Initially about 5mb it grows to 60-70 mb after 2-3 weeks.
I use plpgsql.
If it does matter, server have a chrooted area. Postgres is running in root
but accessed both from root and from chroot (via hardlinked socket /tmp/.s.PGSQL.5432)
Some times ago i upgraded it from 7.0.2 version, that grew too.


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С уважением, Ващенко Максим,
Нижегородские информационные сети
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With best regards, Max Vaschenko,
Nizhny Novgorod Information Networks.