How 2 shutoff verbose logging...

Could someone remind me of how to shutoff the following log
messages?

! postgres usage stats:
!       Shared blocks:          0 read,          0 written,
buffer hit rate = 0.00%
!       Local  blocks:          0 read,          0 written,
buffer hit rate = 0.00%
!       Direct blocks:          0 read,          0 written
! system usage stats:
!       0.000108 elapsed 0.000000 user 0.000000 system sec
!       [0.640000 user 0.040000 sys total]
!       0/0 [0/0] filesystem blocks in/out
!       0/0 [163/524] page faults/reclaims, 0 [0] swaps
!       0 [0] signals rcvd, 0/0 [0/0] messages rcvd/sent
!       0/0 [0/0] voluntary/involuntary context switches

I started postmaster with the following command:  postmaster -i
-o "-F -S 4096 -s"

And I have no pg_options file at all.

Cheers,
Ed Loehr