How many Semaphores needed?

For Oracle Enterprise Server 8.1.7.4
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We are working on getting a new HP-UX 11i (64-bit) server and need to know the semaphore requirements for the unix group.
As per Oracle's recommendation for each instance -

Semaphores = ((value of processes in init file)*2) + a few for Oracle's internal use.

My questions are -

# is the equation same for 64-bit OS (and database)?
Is this a good estimate depending upon if I estimated my processes correctly for all the instances?

# Does this number change with Oracle 9i?

Thanks,
- Rajeev

I'd suggest these values for HP/UX 11i (64-bit). We have used the same values on HP/UX 10.2 (32-bit) on 7.x, 8.x, and 9.x without problems.

SEMMAP (SEMMNI + 2)
SEMMNI 4096
SEMMNS (SEMMNI * 2)
SEMMNU (NPROC - 4)
SEMVMX 32768
SHMMAX Available physical memory
SHMMNI 512
SHMSEG 32

Here's a few that have bit us in the past:
NPROC 4000
MAXUPRC ((NPROC*9)/10)
NFILE (15 * NPROC + 2048)
NFLOCKS 4096


You didn't ask for it, but .. Best of luck .. on your migration to Linux. (just poking fun)

-Ken