Elastic Compute Units
The elastic compute unit (ECU) was introduced by Amazon EC2 as an abstraction of computer resources. Amazon’s Definition of ECU notes “We use several benchmarks and tests to manage the consistency and predictability of the performance of an EC2 Compute Unit. One EC2 Compute Unit provides the equivalent CPU capacity of a 1.0-1.2 GHz 2007 Opteron or 2007 Xeon processor. This is also the equivalent to an early-2006 1.7 GHz Xeon processor referenced in our original documentation”
Read more about this topic: Amazon Elastic Compute Cloud
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