Re: [Xen-users] Java non-performant in a domU?

Christopher G. Stach II
Mon, 05 Jun 2006 03:08:58 -0000

Matthew Palmer wrote:
> Has anyone else seen a significant reduction in performance of Java
> applications running in a domU?  We''re seeing a reduction in
performance of
> around 30% when running a Java (Tomcat, etc webapp) in a domU over running
> it natively -- this is significantly worse than what we see for other
> applications.
>
> Wondering if anyone else has seen this problem (so we know we''re
not going
> nuts), and whether you were able to tune things to make it perform
> acceptably.
>
> In the absence of any solutions, we''re going to have write Xen off
on this
> project, which will be a big shame (and a nasty black mark in
Xen''s copybook
> in the eyes of The Powers That Be).
>
> - Matt
>
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I run lots of Sun JVMs (1.4.2 and 1.5.0 running Tomcat 5.0, Eclipse
3.1.2 and 3.2, Resin 3.0.14) in VMs and they perform about as well as
expected, being that the machine is being used by other VMs and Xen has
a little overhead.  They''re certainly not as fast as they normally are,
but not 30% slower when nothing else is loading the machine.

Is it memory, disk, or CPU that isn''t performing as well?

--
Christoper G. Stach II