A Programming Interface for Overload Control in Staged Event-Based Architectures

Overload control requires different scheduling policies in different application scenarios. In this work, we propose an API that allows the programmer to choose and program scheduling policies in the specific setting of a staged event driven architecture. Through the study of various scheduling policies, we have extracted common requirements and built an interface that allows developers to build and combine scheduling controllers. The implementation is specific to the Leda event driven architecture, but the same model could be applied in other systems with similar needs. Using this interface, we have built controllers for a set of scheduling policies, and we report the results of experiments with these policies in two Leda applications with different load profiles.