I've seen lots of formulas out there based on number of sessions currently
running, number of batch jobs, your batch job limit etc..
In fact I believe the archives may give you those formulas.

We use the formula:

1.5mb X #processes + 100mb

You can get the number of processes running by doing a

SHOWPROC PIN=1;tree;system > temp
LISTFTEMP TEMP,2  << the EOF-2 is # of processes

You also want to get your number of processes during your systems peak
period.

This is not an arbitrary formula but is derived from the formula used by the
dump-to-disk calculations.

dtodsiz.hp36375.telesup 'calc'

The statement, "buy as much as you can afford" has some merits but if you
where to say that to your non-technical manager I think you know what their
reaction would be. I find presenting a factual number is more likely to open
their eyes.



Another consideration on memory is related to MPE/iX 7.0 -

With 7.0 it now scales your MAXPIN (SHOWVAR HPMAXPIN) based on
your systems memory using the following algorithm:

mem <=  64mb   MAXPIN =  400
mem <= 256mb   MAXPIN = 1000
mem <= 512mb   MAXPIN = 2000
mem <=   1gb   MAXPIN = 4000
mem <=   2gb   MAXPIN = 8190
mem >    2gb + BIGPIN enabled + PP1  MAXPIN = 12000

If you have a 6.0 system with 512mb memory running 2500 process you will not
be
able to run those processes after upgrading to 7.0.

Regards,

Guy Paul
NAOD MPE IT Support
Hewlett-Packard Company



-----Original Message-----
From: John Penney [mailto:[log in to unmask]]
Sent: Tuesday, January 08, 2002 11:06
To: [log in to unmask]
Subject: Memory Size Calculation Formula


Dear Listers:

IIRC there used to be some formula or rule of thumb whereby you can
calculate the memory needed to run x numbers of sessions on a 3000. Can
anyone out there refresh my admittedly sometimes senior memory? I can't find
anything in my hp manuals nor on hp's web site.

TIA

John M Penney
Systems Programmer
Production Services
Information Services Department
Pierce County
Tacoma, WA
253-798-6215
253-798-6680 Fax
[log in to unmask]

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