Problem of close system call on AIX

From: Noword Liu (flyooh_at_hotmail.com)
Date: 12/18/03 

Date: 17 Dec 2003 19:37:31 -0800

I write a little program to write some page(size=16384byte) many
times.When I call close(fd) to close file descriptor, this operation
cost so a long time. More times to write, more time costed to close
file desc. Could anybody help me or tell me why?

Thx