The ASCENS project works with systems of self-aware, self-adaptive and self-expressive ensembles. Performance awareness represents a concern that cuts across multiple aspects of such systems, from the techniques to acquire performance information by monitoring, to the methods of incorporating such information into the design making and decision making processes. This chapter provides an overview of five project contributions – performance monitoring based on the
instrumentation framework, measurement evaluation using the
formalism, performance modeling with fluid semantics, adaptation with
and design with
– all in the context of the cloud case study.