Can I provision half a core as a virtual CPU?

Posted by ramdaz on Server Fault See other posts from Server Fault or by ramdaz
Published on 2011-02-14T04:15:37Z Indexed on 2011/02/14 7:27 UTC
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virtualization

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xen

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Cloud

I am virtualization newbie. Please advise on these questions. Please note using a commercial VM software like Citrix or VMware is not a choice for me.

I have at my disposal a couple of 2x 4 core servers with 32 GB RAM. I need to create 16 VMs on each server to test some web applications.

Can I provision half a core as a virtual CPU for each VM? To my best knowledge I can't do so on Xen. Is it possible on KVM or some other free open source VM solution?
If it's not possible to assign half a core, how do I ensure that uniform processing power is available for all VMs?
Since the job is to create separate instances for hosting 16 web apps in a physical server, do you recommend setting up a private cloud using Ubuntu Enterprise Cloud as a better option?
Is there HA solution under KVM, like Remus for Xen?

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