An Exascale Programming, Multi-objective Optimisation and Resilience Management Environment Based on Nested Recursive Parallelism

AllScale Environment

The potential of existing programming models to effectively utilise future Exascale systems, while addressing the challenges of energy-efficiency, diminishing resilience and hardware diversity, is severey limited. It follows that the lack of appropriate, high-productivity and portable programming models for Exascale computing is a fundamental barrier for the future of science and engineering. We propose the AllScale environment for the effective development of highly scalable, resilient and performance-portable parallel applications for Exascale systems. AllScale follows three design principles:

  1. Use a single parallel programming model to target all the levels of hardware parallelism available in extreme scale computing systems.
  2. Leverage the inherent advantages of nested recursive parallelism for adaptive parallelisation, automatic resilience management and auto-tuning for multiple optimisation objectives.
  3. Provide a programming interface that will be fully compatible with widely used industry standards and existing toolchains.



The AllScale project is based on the following hypothesis:

A unified, recursive parallel programming model coupled with advanced, parallelism- and context-aware compiler and runtime optimisation, provides the potential for productive development of Exascale applications that are more scalable, versatile, resilient and portable than their conventionally implemented counterparts.