[Xen-research] Re: bringing multiple VMs at the same time on a multicore system

[Wesley Emeneker <wesley.emeneker@xxxxxxxxx>]

I've been researching (and measuring) this on x86_64 for about a year now.
I've been focusing on how cache structures affect the performance of a
range of scientific applications with various levels of VCPU-pinning.

Some of the questions are:
1. How much do the applications like/hate sharing a last level cache
(usually L2 or L3 depending on what the micro-architecture is)?
2. Do TLBs have much of an effect?
3. Depending on the answer to question 1, how well can applications
share a cache? i.e. if we have a CPU-intensive, small-memory application
how well does it share with a memory-hungry app?


What I've found is that a good many scientific applications actually
like sharing a cache.
If they don't share one, performance often suffers.



Wesley Emeneker


> 
> If we consider the future of computer systems with many cores, the
> problem of bringing multiple VMs at the same time on a multicore
> system becomes critical from the performance and speed point of view.
> I'd like to know whether is there any research on this topic?
> 
> Regards,
> Mehdi

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