Ulrich Rüde, Informatik, FAU Hans-Peter Bunge, Geophysik, LMU Barbara Wohlmuth, Mathematik, TUM Gerhard Wellein, Regionales Rechenzentrum, FAU SPP 1648/1 - SPP Software for Exascale Computing Bonn, 9. Juli 2012

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

2 TERRA-NEO Peter Bunge (LMU München), Ulrich Rüde, Gerhard Wellein (Erlangen), Barbara Wohlmuth (TU München)

Challenges in Earth mantle modeling!•  Forward problem

•  Global nonlinear heat convection and flow problem

•  High resolution for global long term simulation

•  Inherent uncertainties of geophysical parameters

•  Lack of initial conditions renders this an inverse problem

Rheology is the frontier for Geophysics in coming decades!

•  it determines the force balance

•  it cannot be obtained in the lab

•  it must be extracted from the geologic record

... by computational techniques

3 TERRA-NEO Peter Bunge (LMU München), Ulrich Rüde, Gerhard Wellein (Erlangen), Barbara Wohlmuth (TU München)

Exa-Scale Computational Challenge:!Co-Design along the CSE Pipeline !

•  Numerics •  Model adapted accurate and stable hybrid DG-FEM •  Scalable algorithms: Multigrid preconditioning

•  Innovative Parallelization Technology •  Communication-avoiding asynchronous multigrid •  Ultra-scalability to 108 cores and beyond

•  Software Architecture •  Sustainable community code •  Heterogeneous architectures

•  Model Based Performance Engineering •  Power efficiency •  Algorithmically supported resilience

4 TERRA-NEO Peter Bunge (LMU München), Ulrich Rüde, Gerhard Wellein (Erlangen), Barbara Wohlmuth (TU München)

Pro

ject

C

ons

ort

ium!

Mo

del D

evelop

ers!Geophysics ! user community!

Exascale! Systems!

5 TERRA-NEO Peter Bunge (LMU München), Ulrich Rüde, Gerhard Wellein (Erlangen), Barbara Wohlmuth (TU München)

Addressing crucial exascale challenges !

•  Ultra-scalability beyond 108 cores

•  Novel asynchronous algorithmic paradigms

Visions of TERRA-NEO!for exascale!

•  Programming

•  Portability

•  Parallelization

•  Resilience

•  Energy

for geophysics!•  Portable, sustainable, robust community code

•  Fundamental rheologic insight from the inversion of geologic data