Postmaster is getting bigger

Hi everyone, 
 I posted this mail few days ago, but it
seemed that every one focused in about
ECPG problem.  I think it might be concerned 
if I would change another subject.
 I am revamping a computer system by Red Hat 6.0 +
PostgreSQL 6.5.3 + ecpg 2.7 + C. The user interface is
perl Pg + Apache. Everything seems fine, but when I
use "top" to display long term CPU processes, I find
the postmaster is getting bigger in step of 4 kb and
performance is getting worse GRADUALLY (It seems that
perl + Pg would make the size expansion more quickly
than ECPG). Here are some data display in "top": 
PID    SIZE    RSS     TIME    COMMAND
2526    1260   1260      0:00    postmaster  ---- when
postmaster started
2526   28384    20M     4:41    postmaster  ---- 2
days later
 I didn't find any error in tracing my program, and
the child postmaster is terminated correctly. I really
can't figure out the reason. Please give me advise. 
 I have installed the latest version 7.0RC5, but
Postmaster is getting bigger also (perl + Pg)

  Thanks              S.F.Lee

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