TERRA-NEO - Integrated Co-Design of an Exascale Earth Mantle Modeling Framework

TERRA-NEO - 百亿亿次地幔建模框架的集成协同设计

• 批准号: 230862710
• 负责人: Professor Dr. Hans-Peter Bunge, Ph.D.
• 金额: --
• 依托单位: Lehrstuhl für Numerische Mathematik (M2)
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2012
• 资助国家: 德国
• 起止时间: 2011-12-31 至 2019-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/230862710?language=en
• 关键词: TERRA; NEO; Integrated; Co; Design

Much of what one refers to as geological activity of the Earth is due to the fact that heat is transported from the interior of our planet to the surface in a planetwide solid-state convection of the Earth's mantle. Linking mantle processes to their surface manifestations is seen widely today as one of the most fundamental problems in the Earth sciences, while being at the same time a matter of direct practical relevance through their impact on the evolution of sedimentary basins and their paramount economical importance.The sheer magnitude of the computational challenge of earth mantle simulations on modern super- computer architectures can be grasped easily from the dramatic growth of disciplinary complexity. Dominating roadblocks in Geophysics are model complexity and uncertainty in parameters and data, e.g., rheology and seismically imaged mantle heterogeneity, as well as the enormous space and time scales one must resolve. In Algorithmics, the traditional view of optimality is more and more obsolete and must be replaced by new HPC performance oriented metrics. In Exascale Computing, the disruptive transition from modest concurrency to billions of threads leaves the software devel- opment trailing behind. This consortium has already demonstrated the potential of interdisciplinary research by a series of joint publications, see Part B Subsection 1.1, and is fully committed to the cross-disciplinary collaboration that is necessary for creating TERRA-NEO as new community-usable, sustainable exascale simulation framework.The new community code TERRA-NEO will be based on a carefully designed multi-scale finite ele- ment discretization using an icosahedral mesh with block-wise refinement for the non-linear trans- port processes in the Earth mantle. This permits the construction of exascale solvers with maximal scalability and optimal efficiency. We have already demonstrated the computation of flow fields on petascale supercomputers with a resolution of globally 1km that would have been unthinkable until recently since it requires the solution of indefinite systems of more than 10 to the 12 unknowns per time step.Advancing to exascale, we will develop communication-avoiding, asynchronous solution techniques that alleviate the traditional over-synchronization of hierarchical iterative methods, enabling the solution of inverse problems and the quantification of uncertainties. Advanced resiliency techniques will be supported on the algorithmic level. TERRA-NEO will be developed specifically for the upcoming heterogeneous exascale computers in an architecture-aware design process that is guided by performance models, leading to a holistic co-design of the data structures and algorithms.

人们所说的地球的地质活动大部分是由于热量从地球内部通过地幔的固态对流传输到地球表面。如今，将地幔过程与其表面表现联系起来被广泛视为地球科学中最基本的问题之一，同时，通过它们对沉积盆地演化的影响和它们最重要的经济意义，它们也是一个直接的实际相关问题。计算机体系结构可以从学科复杂性的急剧增长中容易地掌握。地球物理学中的主要障碍是模型复杂性以及参数和数据的不确定性，例如，流变学和地震成像地幔不均匀性，以及巨大的空间和时间尺度必须解决。随着时间的推移，传统的最优性观点越来越过时，必须被新的面向HPC性能的指标所取代。在Exascale计算中，从适度并发到数十亿线程的破坏性转变使软件开发落后。该联合体已通过一系列联合出版物（见第B部分第1.1小节）展示了跨学科研究的潜力，并充分致力于开展跨学科合作，这对于将TERRA-NEO创建为社区可用的新的新的社区代码TERRA-NEO将基于精心设计的多尺度有限元素，采用分块加密的二十面体网格离散地幔非线性输运过程。这允许构建具有最大可扩展性和最佳效率的exascale求解器。我们已经演示了在千万亿次超级计算机上进行流场计算，其分辨率为全球1 km，这在最近之前是不可想象的，因为它需要解决每个时间步长超过10到12个未知数的不确定系统。推进到千万亿次，我们将开发避免通信的异步求解技术，以减轻传统的分层迭代方法的过度同步，使得能够解决逆问题和量化不确定性。将在算法层面上支持高级弹性技术。TERRA-NEO将专门为即将到来的异构艾级计算机开发，其架构感知设计过程由性能模型指导，从而实现数据结构和算法的整体协同设计。