SUMMARY: Solaris 8 on sun4u/sun4u1 : 32 or 64 bits

From: DAUBIGNE Sebastien - BOR <SDaubigne_at_bordeaux-bersol.sema.slb.com>
Date: Mon Jan 19 2004 - 09:16:24 EST
Thanks to Roland Rebstock and Russell Page.

Answer is : "There is no performance gain or loss when booting Solaris to 32
bit or 64bit when running Oracle. The Solaris 64bit O/S will run without any
performance issues with 32 bit applications".

---
Sebastien DAUBIGNE
sdaubigne@bordeaux-bersol.sema.slb.com
<mailto:sdaubigne@bordeaux-bersol.sema.slb.com>  - (+33)5.57.26.56.36
SchlumbergerSema - SGS/DWH/Pessac

-----Message d'origine-----
De:	sunmanagers-bounces@sunmanagers.org
[SMTP:sunmanagers-bounces@sunmanagers.org] @ la place de DAUBIGNE Sebastien
- BOR
Date:	mercredi 14 janvier 2004 11:56
@:	sunmanagers@sunmanagers.org
Objet:	Solaris 8 on sun4u/sun4u1 : 32 or 64 bits

As you know, Solaris 8 boots with 64 bits kernel as default when running on
E6500/E10K. I would like to hear your opinion on booting 32 bits kernel with
theses architectures.

An Oracle tech recommended to boot with 32 bits kernel for Oracle 8i
(8.1.7.4)  32 bits to perform better.
Here is his statement :
"Solaris 8 OS 32bits with Oracle 8i 32bits will perform well for you
application. There is no reason to run Solaris 8 64bits with Oracle 8i 64
bits, except when you have to exceed 32 bits limits".

I could easily understand that Oracle 32bits is sufficient and Oracle 64
bits only necessary when you need very large SGA or such 64 bits-related
things.

But for Solaris 8, I though that 64 bits kernel was recommended and
performed better for all UltraSparc2/UltraSparc3 servers. If not the case,
why would Solaris boots the 64 bits kernel as default ? Is this
necessary/better to boot 32 bits kernel when no 64 bits apps are running ?

Any opinion appreciated.

---
Sebastien DAUBIGNE
sdaubigne@bordeaux-bersol.sema.slb.com
<mailto:sdaubigne@bordeaux-bersol.sema.slb.com>  - (+33)5.57.26.56.36
SchlumbergerSema - SGS/DWH/Pessac
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Received on Mon Jan 19 09:16:13 2004

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