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From: aotto on 2 Apr 2008 07:30

Hi,

I have a question regarding migration from SLES9 to SLES10

currently we running an application on 32 Bit SLES9 compiled with
GCC-3.3

In future we want to run the same application on a 64 Bit SLES10
still compiled
as 32 Bit application using the gcc-4.1 compiler

The reason for this is:
1. The application at all does not using more than 2G as memory
2. The amount of work to migrate to a "real" 64 Bit application is
currently to big

But I still have one open question

If the 64 Bit SLES 10 host is using > 4G memory, it is possible to
use multiple
32 Bit apps with ~ 2G memory per app run on this host (access
physical memory larger
than 4G)

calculation:

64 Bit SLES10 host has 12G physical memory
can I run (at the same time) 10 x 32 Bit apps a 2G using together
10G of physical memory on the 64 BIT
SLES10 host?


thanks for the answer


mfg

Andreas Otto
From: Günther Schwarz on 2 Apr 2008 15:43
aotto wrote:

> If the 64 Bit SLES 10 host is using > 4G memory, it is possible to
> use multiple
> 32 Bit apps with ~ 2G memory per app run on this host (access
> physical memory larger
> than 4G)

Yes, why not? Make sure that the necessary 32 libraries are installed.

> calculation:
>
> 64 Bit SLES10 host has 12G physical memory
> can I run (at the same time) 10 x 32 Bit apps a 2G using together
> 10G of physical memory on the 64 BIT
> SLES10 host?

You might learn the hard way that 10*2!=10 ;-)
From your name I guess that you speak German. C't magazine has a good
article on 64 bit operating systems in the current issue 08/2008.

G�nther
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