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RE: [Xen-users] Xen domU in a compile farm

To: "François Visconte" <Francois.Visconte@xxxxxxxxxxxx>, xen-users@xxxxxxxxxxxxxxxxxxx
Subject: RE: [Xen-users] Xen domU in a compile farm
From: "Petersson, Mats" <Mats.Petersson@xxxxxxx>
Date: Mon, 4 Sep 2006 15:30:55 +0200
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Thread-topic: [Xen-users] Xen domU in a compile farm

> -----Original Message-----
> From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx 
> [mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of 
> François Visconte
> Sent: 04 September 2006 09:25
> To: xen-users@xxxxxxxxxxxxxxxxxxx; Francois.Visconte@xxxxxxxxxxxx
> Subject: [Xen-users] Xen domU in a compile farm
> Hello everyone,
> We plan to build a compile farm for various kind of software.
> As we use Xen for some server since a year ago, i would like 
> to know if 
> xen is
> a good candidate for this kind of use.
> Particularly, is xen virtualisation system can be used to 
> compile some 
> optimized software.
> Can we use exactly the same instruction set than on physical machines.
> What can of problem can be revealed by this kind of use.

As long as the hardware supports the instructions, it should work just fine, 
yes. Xen has sufficient support to work fine with SSE/MMX/3DNow! instructions 
just like it would on normal systems. If you're doing performance testing, you 
may need to make sure that you're not mixing Xen with non-Xen measurements, as 
the handling may take a different route. But I expect that you'd run bare-metal 
to get performance measurments anyways... 

[Exception: If you're accessing either virtualized hardware (in HVM) or 
page-tables (either HVM or PV) using SSE/MMX/3Dnow! type instructions, it won't 

> Cheers,
> François Visconte <visconte@xxxxxxxxxxxx>
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