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

[Matthew Palmer <mpalmer@xxxxxxxxxxx>]

On Mon, Jun 05, 2006 at 12:14:55AM -0500, Javier Guerra wrote:
> On Sunday 04 June 2006 10:53 pm, Matthew Palmer wrote:
> > That's the crazy thing -- we've been monitoring everything we can, and we
> > can't find any anomalous bottlenecks.  The application is naturally CPU
> 
> just a wild guess, but on a heavily multithreaded and multiprocessor system 
> like yours, its quite possible that a given JVM could use a non-optimal 
> strategy on a Xen system.  I think it's important to test different JVM's, 
> and different 'bitness' of them (64bit vs. 32bit). Since 32bit x86 is _SO_ 
> register-starved, and Xen interferes with the infamous TLS trick, you should 
> try to use a 64bit clean system.  since you already stated that your software 
> can't run on a 64bit JVM, maybe you could get some insight by running a 
> benchmark with similar threading and processor requirements, on all 
> combinations of 32bit, 64bit, Xen and non-Xen.

Hmm.  You've given me some more ideas for benchmarking; I'll try out some
different combos (the different JVM idea is a particularly good one) and
report back to the list.

Thanks a lot for your help,
- Matt

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