Path: utzoo!utgpu!cunews!bnrgate!bigsur!bnr-rsc!nmerh53!hounsell
From: hounsell@nmerh53.BNR.CA (Rob Hounsell)
Newsgroups: comp.sys.hp
Subject: Demand-loaded vs. Shared binaries
Keywords: shared demand
Message-ID: <4670@bnr-rsc.UUCP>
Date: 21 Jun 91 15:34:03 GMT
Sender: news@bnr-rsc.UUCP
Reply-To: uunet!chekov!hounsell
Organization: Northern Telecom Canada
Lines: 39

Folks,

  We are in the middle of a debate about the exact definition of demand-loaded
versus shared binaries on our HP-UX 9000/300 and 9000/800 computers.

  Looking at the manuals on Laserrom, it states that only the HP300 series
support demand-loaded code, and that the series 800 (HP-PA) does not. Both
models support shared (and non-shared?) code.

  This brings up several questions, which I hope the gurus at HP can answer.
The Response Center was of some help...

1. If the 800s don't support demand-loaded paging, why does chatr allow you to
   change the attribute to demand-loaded?

2. If the monitor program is run on the 800s, why does it show paging stats in
   the virtual memory screen, if it doesn't support demand-loading? Does it 
   still use pages to swap in the entire shared code?

3. Can a binary be BOTH demand-loaded and shared? Does setting the demand-load
   flag prevent the code from being shared? Conversely, does setting the shared
   flag imply it is demand-loaded as well??? 

4. What is the result if you set 800 code to be demand-loaded? What does the
   loader do then?

  Based on looking at our machines, it doesn't seem possible that they can run
without doing some kind of paging instead of swapping. Can anyone clear this
up??

Thanks in advance,

Rob
+-----------------------------------------------------------------------------+
| Rob Hounsell                           UUNET:  ...!chekov!hounsell          |
| NT Product Support Technology          BNR WAN:  hounsell@nmerh53           |
|                                        PHONE: (613) 765-2904                |
|                                        ESN: 395-2904                        |
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