Real-Time Model of Computation over HPC/Cloud Orchestration - The LEXIS Approach

In the LEXIS project, a tsunami and earthquake large scale pilot is being deployed on top of an innovative HPC/Cloud orchestration layer, combining real-time deadlines, high performance simulations and cloud processing. To handle this, we have relied on a suitable model of computation oriented towards performance and real-time requirements, and used it to model, map and integrate the pilot workflow over the LEXIS orchestration and data exchanges technologies. This paper describes how the model of computation expresses real-time constraints over workflows, how such a model can be used to compute the necessary resources for a target latency and quality of service, and how the LEXIS orchestration layer is extended to offer the necessary features to implement this workflow.