[n_are_q]

Aren't metrics such as "seconds on an ec2 instance" not particularly meaningful because you get highly variable performance per instance based on who else is using the actual hardware? Am I correct to assume that m2.2xlarge instances are shared like other instance types?

[benologist]

There was a great blog post the other week that explained the multi-tenancy stuff really well:

http://perfcap.blogspot.com/2011/03/understanding-and-using-...

Somewhere there's an HN discussion for it too.