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Sandia National Laboratories is a multi-program laboratory managed and operated by Sandia Corporation, a wholly owned subsidiary of Lockheed Martin Corporation,

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Presentation on theme: "Sandia National Laboratories is a multi-program laboratory managed and operated by Sandia Corporation, a wholly owned subsidiary of Lockheed Martin Corporation,"— Presentation transcript:

1 Sandia National Laboratories is a multi-program laboratory managed and operated by Sandia Corporation, a wholly owned subsidiary of Lockheed Martin Corporation, for the U.S. Department of Energy’s National Nuclear Security Administration under contract DE-AC04-94AL Photos placed in horizontal position with even amount of white space between photos and header The Mantevo Project : Tools for codesign Richard F. Barrett Scalable Computer Architectures Sandia National Laboratories, NM SAND P ASCR X-Stack PI and coordination meeting March 22, 2013 Lawrence Berkeley National Laboratory 1

2 Development Team  Daniel Barnette (Sandia), Richard Barrett (Sandia, Co-lead), David Beckingsale (U. Warwick), Jim Belak (LLNL), Mike Boulton (U. Bristol), Paul Crozier (Sandia), Doug Doerfler (Sandia), Carter Edwards (Sandia), Wayne Gaudin (AWE), Tim Germann (LANL), Si Hammond (Sandia), Andy Herdman (AWE), Mike Heroux (Sandia, Co-lead), Stephen Jarvis (U. Warwick), Paul Lin (Sandia), Justin Luitjens (Nvidia), Andrew Mallinson (U. Warwick), Simon McIntosh-Smith (U. Bristol), Sue Mniszewski (LANL), Jamal Mohd-Yusof (LANL), David Richards (LLNL), Christopher Sewell (LANL), Sriram Swaminarayan (LANL), Heidi Thornquist (Sandia), Christian Trott (Sandia), Courtenay Vaughan (Sandia), Alan Williams, and your name here. 2

3 Theory Simulation Experiment Pillars of science 3 Performance models Miniapps on testbeds Architecture simulators, e.g. SST

4  1M+ SLOC, written using  MPI + Fortran/C/C++ (+ OpenMP),  depending on multiple tpls,  executing on multiple generations of machines from multiple vendors,  capture the work of generations of scientists, and are  getting mission-driven work done today! Application codes are…

5 Miniapps : Tools enabling exploration 5 FocusProxy for a key app performance issue IntentTool for codesign: output is information Scope of changeAny and all SizeK SLOC AvailabilityOpen source (LGPL) Developer/ownerApplication team Life spanUntil its no longer useful Related: BenchmarkOutput: metric to be ranked. Compact appApplication relevant answer. Skeleton appInter-process comm, application “fake” Proxy appÜber notion

6 Note:  Goal is to tune application, not miniapp.  Assessing the predictive capabilities of miniapps  v_SAND.pdf  Trinity procurement using miniapps:  rfp/draft-nersc-8-trinity-benchmarks/ 6

7 Mantevo project 7 Miniapp CloverLeafCompressible Euler eqns on Cartesian grid, explicit, 2 nd order CoMDMolecular dynamics, mimics SPaSM. HPCCGConjugate gradient solver miniFEImplicit finite element solver miniGhostFDM/FVM explicit miniMDMolecular dynamics (Lennard-Jones) miniXyceSPICE-style circuit simulator mini”Aero”*tbd miniAMR*Eulerian on structured grid with AMR miniExDyn-FEExplicit Dynamics (Kokkos-based) miniITC-FEImplicit Thermal Conduction (Kokkos-based) miniWave* Lagrangian FEM for the hyperbolic wave equation PathFinder*Data analytics phdMeshExplicit FEM: contact detection * in development Version 1.0

8 Snapshot of Technologies MPIIntrins.CUDAOpenAccOpnCL Kokkos Array Cilk+ OpenMP TBB ArBB/CE AN qthreadspthreads MKL/Ma th Lib. Adv. Lang. DSLs DPTP NVIDIA (GPU)? AMD (CPU)? AMD (APU)?? Intel (CPU)? Intel (MIC)? IBM (BG)?? ARM? miniFE miniMD miniGhost LULESH S3D CoMD Vectorization ThreadingNode Level Future Languages

9 Impact of memory speeds, Charon and miniFE 9 Nehalem Charon and miniFE MagnyCours miniFE red : FEA blue : CG

10 10 CTH (and miniGhost) Original Re-ordered Charon miniFE Communication patterns

11 Revisiting halo exchange strategies: 11 num_vars do i = 1, num_tsteps end do do j = 1, num_vars end do compute Multi- MBytes CTH : Eulerian Multi-material modeling application. 3-d, finite volume, stencil computation. BSP with message aggregation (BSPMA). miniGhost Mantevo miniapp configured as proxy.

12 CTH and miniGhost Chama Cielo

13 CTH and miniGhost Chama Cielo Profiling shows that computation time remains constant, but need more experiments to make stronger claim.

14 Alternative inter-node strategy : Single Variable Aggregated Faces (SVAF) 14 Future architectures : less global bandwidth proportional to msg injection rate and bw end do compute do i = 1, num_tsteps do j = 1, num_vars end do

15 15 Cielo Chama SVAF performance

16 miniGhost : Difference stencils on XK6 node 16 Not enough memory

17 miniGhost : Strong scaling on XK domain, 20 variables 17 Begin gpu

18 Summary  Concrete steps can be taken to preparing applications for what we see impacting exascale computation.  These steps lead to stronger performance on current and emerging architectures.  Miniapps and testbeds enable a tractable means for exploring these issues.  Mailing lists: On-going work  Intel φ, Kepler, ARM, XC, Tilera, Convey, Xeon, Opteron, …  Revolutionary programming models, languages, mechanisms 18

19  Towards Performance Predictive Application-Dependent Workload Characterization, W. Alkohlani and J. Cook, In Performance Modeling, Benchmarking and Simulation of High Performance Computer Systems (PMBS12),  Exascale Work-load Characterization and Architecture Implications, P. Balaprakash, D. Buntinas, A. Chan, A. Guha, R. Gupta, S. H. K. Narayanan, A. A. Chien, P. Hovland, and B. Norris. Technical Report ANL/MCS- P , Argonne National Laboratory, July  A case for dual stack virtualization: consolidating hpc and commodity applications in the cloud, B. Kocoloski, J. Ouyang, and J. Lange. In Proceedings of the Third ACM Symposium on Cloud Com- puting, SoCC ’12, New York, NY, USA,  Report of Experiments and Evidence for ASC L2 Milestone Demonstration of a Legacy Application’s Path to Exascale, B.W. Barrett et al. Technical Report SAND , Sandia National Laboratories,  Task Mapping for Noncontiguous Allocations, S.P. Feer, Z.D. Rhodes, N.W. Price, D.P. Bunde, and V.J. Leung. Technical report, SAND C, Submitted.  Communication Optimization Beyond MPI, Andrew Friedley and Andrew Lumsdaine. In Proceedings of the 2011 IEEE International Symposium on Parallel and Distributed Processing Workshops and PhD Forum, IPDPSW ’11. IEEE Computer Society,  On the Viability of Checkpoint Compression for Extreme Scale Fault Tolerance, Dewan Ibtesham, Dorian Arnold, Kurt B. Ferreira, and Patrick G. Bridges. In Proceedings of the 2011 international conference on Parallel Processing - Volume 2, Euro-Par’11. Springer-Verlag,  Charm++ for productivity and performance, L. Kale et al.,  GPU Acceleration of Data Assembly in Finite Element Methods and Its Energy implications, L.Tang, X.Sharon Hu, Danny Z. Chen, M. Niemier, R.F. Barrett, S.D. Hammond, and G. Hsieh  A performance model with a fixed point for a molecular dynamics kernel, Robert W. Numrich and Michael A. Heroux.. Computer Science - Research and Development, 23(3-4), June  Micro-applications for communication data access patterns and mpi datatypes, Timo Schneider, Robert Gerstenberger, and Torsten Hoefler. In Proceedings of EuroMPI, Lecture Notes in Computer Science, volume Springer,  Exploring latency-power tradeoffs in deep non-volatile memory hierarchies, Doe Hyun Yoon, Tobin Gonzalez, Parthasarathy Ranganathan, and Robert S. Schreiber. In Proceedings of the 9th conference on Computing Frontiers, CF ’12, pages 95–102, New York, NY, USA, ACM. 19

20  Mantevo Home Page  Improving Performance via Mini-applications. M.A. Heroux et al. Technical Report SAND , Sandia National Laboratories, September  Using the Cray Gemini Performance Counters, K.T. Pedretti, C.T.Vaughan, K.S.Hemmert, and R.F. Barrett. In Proc. 55th Cray User Group Meeting,  Exascale Computing and the Role of Co-design. In High Performance Computing: From Grids and Clouds to Exascale, chapter. J. Ang et al. IOS Press Inc,  Emerging High Performance Computing Systems and Next Generation Engineering Analysis Applications, J.A. Ang, R.F. Barrett, S.D. Hammond, and A.F. Rodrigues. In Pacific Rim Workshop on Innovations in Civil Infrastructure Engineering. National Taiwan University of Science and Technology, SAND P.  Summary of Work for ASC L2 Mile- stone 4465: Characterize the Role of the Mini-Application in Predicting Key Performance Characteristics of Real Applications, R.F. Barrett, P.S. Crozier, S.D. Hammond, M.A. Heroux, P.T. Lin, T.G. Trucano, and C.T. Vaughan. Technical Report SAND , Sandia National Laboratories,  Assessing the Validity of the Role of Mini- Applications in Predicting Key Performance Characteristics of Scientific and Engineering Applications, R.F. Barrett, P.S. Crozier, S.D. Hammond, M.A. Heroux, P.T. Lin, T.G. Trucano, and C.T. Vaughan. In preparation.  Exascale Design Space Exploration and Co-design. R.F. Barrett, D.W. Doerfler, S.S. Dosanjh, S.D. Hammond, K.S. Hemmert, M.A. Heroux, P.T. Lin, J.P. Lutjiens, K.T. Pedretti, A.F. Rodrigues, and T.G. Trucano. Under review,  Navigating An Evolutionary Fast Path to Exascale, R.F. Barrett, S.D. Hammond, C.T. Vaughan, D.W. Doerfler, M.A. Heroux, J.P. Luitjens, and D. Roweth. In Performance Modeling, Benchmarking and Simulation of High Performance Computer Systems (PMBS12), Extended version: Technical Report SAND , Sandia National Laboratories,  Application Explorations for Future Interconnects, R.F. Barrett, C.T. Vaughan, S.D. Hammond, and D. Roweth. In Workshop on Large Scale Parallel Processing, at the IEEE International Parallel & Distributed Processing Symposium (IPDPS) Meeting,  MiniGhost: A Miniapp for Exploring Boundary Exchange Strategies Using Stencil Computations in Scientific Parallel Computing, R.F. Barrett, C.T. Vaughan, and M.A. Heroux. Technical Report SAND , Sandia National Laboratories, May  Toward codesign in high performance computing systems, R.F. Barrett, X. S. Hu, S.S. Dosanjh, S. Parker, M.A. Heroux, and J. Shalf. In Proceedings of the International Conference on Computer- Aided Design, ICCAD ’12, New York, NY, USA, ACM.  Mantevo views: A flexible system for gathering and analyzing data for the mantevo project, Cameron Christesen. College of St. Benedict/St. John’s University Senior Honors Thesis, Undergraduate Thesis. 20


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