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Xorlev
on April 22, 2013
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Has Amazon EC2 become over subscribed? (2010)
c1.xlarges are thought to be effectively the only VM on a machine. I can't dig up the article that proposed the methodology for determining offhand.
c1.xlarges still underperform far under what I'd expect.
sliverstorm
on April 22, 2013
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Are VMs ever really performant?
Xorlev
on April 22, 2013
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Compared to the 26 ECU m3.2xl, the 20 ECU c1.xl underperforms it by 3x (basic web, JSON struct) in my tests.
corresation
on April 22, 2013
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Modern hypervisors have an overhead as low as 2%, so yes, they absolutely are. It is often worth virtualizing simply for the flexibility/management that it bring, even if it's a single virtual machine on a very large box.
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c1.xlarges still underperform far under what I'd expect.