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c1.medium used to be the cpu workhorse on ec2, but with the new generation, they're almost always not the ideal choice. For example, for this use case, what about c3.larges? They're cheaper and have more CPU [1]. And if you don't need to have a lot of storage, the smaller SSD's can even improve your throughput.

[1] http://www.ec2instances.info/

There's a nice AWS re:Invent 2014 presentation on performance tuning EC2 that starts talking about instance selection and moves onto more detailed topics (EC2 features, kernel tuning, observability).


This post was written a couple months before the c3s were released, I think.

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