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ADVANCED SCIENTIFIC COMPUTING
Dr. – Ing. Morris RiedelAdjunct Associated ProfessorSchool of Engineering and Natural Sciences, University of IcelandResearch Group Leader, Juelich Supercomputing Centre, Germany
PrologueAugust 22, 2017Room TG-227
High Performance Computing
LECTURE 0
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Outline of the Course
1. High Performance Computing
2. Parallelization Fundamentals
3. Parallel Programming with MPI
4. Advanced MPI Techniques
5. Parallel Algorithms & Data Structures
6. Parallel Programming with OpenMP
7. Hybrid Programming & Patterns
8. Debugging & Profiling Techniques
9. Performance Optimization & Tools
10. Scalable HPC Infrastructures & GPUs
Lecture 0 - Prologue
11. Scientific Visualization & Steering
12. Terrestrial Systems & Climate
13. Systems Biology & Bioinformatics
14. Molecular Systems & Libraries
15. Computational Fluid Dynamics
16. Finite Elements Method
17. Machine Learning & Data Mining
18. Epilogue
+ additional practical lectures for our
hands-on exercises in context
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Course Information
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Positioning in the Field of High Performance Computing
Consists of techniques for programming large-scale HPC Systems Approach: Get a broad understanding what HPC is and what can be done Goal: Train general HPC techniques and bits of domain-specific applications
Lecture 0 - Prologue
High Performance Computing(a field of constant changes)
HPC Course
Domain-specific Science &
Engineering A
Domain-specific Science &
Engineering B
Domain-specific Science &
Engineering C
Domain-specific Science &
Engineering D
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Course Motivation
Parallel processing and distributed computing have matured (over the past three decades) Both Emerged as a well developed field in computer science
‘Scientific computing‘ with Maple, Matlab, etc. Performed on small computing machines like Desktop PCs or Laptops Increasing number of cores enables ‘better scientific computing‘ today Good for small & less complex applications, quickly reach memory limits
‘Advanced scientific computing‘with computational simulations Performed on large parallel computers;
often scientific domain-specific approaches Use orders of magnitude more cores & memory Enables ‘simulations of reality‘ often based on
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Selected Learning Outcomes
Students understand… Latest developments in parallel processing
and high performance computing (HPC) How to create high-performance clusters What are scalable networks & workloads The importance of domain decomposition Complex aspects of parallel programming HPC environment tools that support programming or analyze behaviour Different abstractions of parallel computing on various levels Foundations and approaches of scientific domain specific applications
Students are able to … Programm and use HPC programming paradigms (i.e. MPI / OpenMP) Take advantage of innovative scientific computing simulations Work with technologies and tools to handle parallelism complexity
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Lecturer Morris Riedel (since ~2004 in HPC)
Holds PhD in Computer Science (from Karlsruhe Institute of Tech.) MSc in data visualization and steering of HPC & Grid applications
Over the time several Positions at Juelich Supercomputing Centre OS, Grid divisions; later deputy division leader federated systems and data Currently: Research Group Leader – High Productivity Data Processing
Selected other recent activities Working with CERN & LHC & Grid/Cloud
(Strategic Director of EU Middleware) Architect of Extreme Science and
Engineering Discovery Environment XSEDE (US HPC Infrastructure)
Co-Design of European Data Infrastructure (EUDAT) services, Research Data Alliance Big Data (Analytics) Chair, DEEP-EST HPC Machine Developments
University of IcelandCourses: HPC A / B, Statistical Data Mining, Cloud Computing & Big Data
Lecture 0 - Prologue
[1] Morris Riedel Web page
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Juelich Supercomputing Centre (JSC)
Part of Research Centre ‘Forschungszentrum Jülich’ in Germany Founded in 1956 as nuclear research facility, staff ~4500 90% Federal Republic of Germany; 10% State of North Rhine-Westphalia Research Areas: Health, Energy & Environment, Information, Key
Competency (e.g. HPC and computational science, big data processing) JSC is part of the Insitute for Advanced Simulation (IAS)
Operate supercomputers ( TOP500), cloud systems, and large storages Enable scientists to solve complex problems via simulations and analytics
Lecture 0 - Prologue
[2] Juelich Supercomputing Centre Web page8 / 37
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Juelich Supercomputing Centre – Major HPC Resources
JUQUEEN – Juelich BlueGene/Q 28 racks (7 rows à 4 racks); 28.672 nodes (458.752 cores) Nodeboard: 32 compute nodes (1 node 16 cores); main memory: 448 TB Overall peak performance: 5.9 Petaflop/s (Linpack: 5.0 Petaflop/s)
JURECA – Intel XEON Cluster with NVIDEA GPUs 75 nodes equipped with two NVIDIA K80 GPUs 1872 compute nodes; 45216 CPU cores; 79 TB main memory 1.8 (CPU) + 0.44 (GPU) Petaflop per second peak performance
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Juelich Supercomputing Centre – HPC & ‘Big Data‘ Ecosystem
Lecture 0 - Prologue
Lots of practice experience goes into the course to tacklereal world problems
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Lecture 1 – High Performance Computing
What means ‘high performance‘? Four basic building blocks of HPC TOP500 and Performance Benchmarks Relationship to ‘Parallelization‘
HPC Architectures Shared Memory & Distributed Memory Architectures Hybrid and Emerging Architectures Parallel Applications and Infrastructures
HPC Ecosystem Software Environments & Scheduling System Architectures & Data Access Multicore Processor Design Network Topologies Interesting international HPC Projects
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Lecture 2 – Parallelization Fundamentals
Parallel Applications Simple first parallel application examples Gradually more complex applications
Common Strategies for Parallelization Moore’s law Parallelization reasons and approaches Various domain decompositions Data parallelism methods Functional parallelism methods
Common goals & problems Speedup Higher throughput Better granularity Load imbalance
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Lecture 3 – Parallel Programming with MPI
Message Passing Interface (MPI) Concepts Distributed memory systems Message passing functions Understanding the functionality of MPI collectives Standardization & portability Using MPI rank and communicators
MPI Parallel Programming Basics Environment with libraries & modules Thinking Parallel Basic building blocks of a program Compilations of codes Parallel executions ‘Bad‘ code examples vs.
good code examplesLecture 0 - Prologue
HPC Machine
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Lecture 4 – Advanced MPI Techniques
MPI Communication Techniques MPI Communicators Cartesian Communicator Hardware & Communication Issues Network Interconnects Task-Core Mappings Application examples
MPI Parallel I/O Techniques I/O Terminologies & Challenges Parallel Filesystems MPI I/O Techniques Higher-Level I/O Libraries Portable File Formats Application examples
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Lecture 5 – Parallel Algorithms & Data Structures
Lecture 0 - Prologue
Selected Parallel Algorithms Vector Addition in MPI & OpenMP Matrix – Vector Multiplication in MPI Fast Fourier Transform with MPI Advanced Algorithm Examples Use of MPI collectives in applications
Selected Data Structures Basic MPI Datatypes Arrays &
Multi-dimensional datasets Derived MPI Datatypes Relationships to
Parallel IO & Filesystems
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Lecture 6 – Parallel Programming with OpenMP
Lecture 0 - Prologue
Shared-Memory Programming Concepts Parallel and Serial Regions Fork & Joins Master and Worker Threads Portability Application Examples Differences to distributed memory
OpenMP Parallel Programming Basics Basic building blocks Local/shared variables & Loops Synchronization & Critical Regions Selected Comparisons with MPI Simple Applications
int main()
{
#pragma omp parallel
printf(„Hello World“);
}
int main()
{
#pragma omp parallel
printf(„Hello World“);
}
mT T0
T1
T2
T3
masterthreadbecomes T0
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Lecture 7 – Hybrid Programming & Patterns
Hybrid Programming Motivation and Memory Benefits Programming Hybrid Systems Vector Mode and Task Mode Lessons Learned & Performance Another type of Hybrid Programming Application Examples
Programming Patterns Neareast Neighbour Communication Cartesian Communicator Shifts Stencil-based Iterative Methods Jacobi 2D Application Example Working with Halo Regions Application Examples
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Lecture 8 – Debugging & Profiling Techniques
Debugging Techniques Origin and Terminologies Bug Prevention Approaches Review Printf Debugging Advanced Debugging Techniques Selected Debugging Tools
Profiling Techniques Terminologies Understanding Wall-clock time Simple MPI Timing Approaches MPI Profiling Interface Selected Profiling Tools
Lecture 0 - Prologue
P1 P2 P3 P4 P5
Shar
ed M
emor
y
T1 T2 T3 T4 T5
x=1 or x=2x =?
x=1x=2
x =?
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Lecture 9 – Performance Optimization & Tools
Parallelization Terms & Theory Speedup & Load Imbalance Role of Serial Elements Scalability Metrics & Performance Amdahl’s Law & Performance Analysis
Performance Optimization Terminologies & Metrics Tracing Technique Open Tracing Format Selected Tools & Technologies
Selected Optimization Methods Simple Loops Constructs Improve MPI Function Calls MPI & OpenMP Problem Patterns
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Lecture 10 – Scalable HPC Infrastructures & GPUs
Scalable Infrastructures Large Scale HPC Infrastructures e-Science and Grid Computing Cloud Computing Infrastructures Collaborative Data Infrastructures Scientific Workflows Applications
GPGPUs Terminology & Architecture Programming Models Usage Models & Applications Nvidia & CUDA Examples OpenCL Approach Applications
Lecture 0 - Prologue
Large-scale HPC centres(e.g. EU HPC centres)
National HPC centres(e.g. German HPC centres)
Topical and Regional HPCCentres (e.g. climate centre)
Servers and small clusters(e.g. universities, institutes)
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Lecture 11 – Scientific Visualization & Steering
Scientific Visualization Motivation & Objectives Understanding HPC Simulation Data Selected Visualization Techniques Selected Tools and Technologies Multi-scale Visualization Example Application Examples
Computational Steering Motivation & Terminology Different Methods Iterative Application Examples Selected Tools and Technologies Advanced Interactive Visualization Application Examples
Lecture 0 - Prologue
(‘a picture is worth 1000 words numbers‘)
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Lecture 12 – Terrestrial Systems & Climate
Terrestrial Systems Numerical Terrestrial Simulations & Models ParFlow Hydrology Parallel Application CLM Land-Surface Model Parallel Application COSMO Weather Model Parallel Application Coupled Models & Other Models & Libraries Application Examples
Climate Numerical Weather Prediction & Forecast Role of Partial Differential Equations (PDEs) WRF Model Parallel Application SAR Weather Project & Business Case Other Models & Libraries Application Examples
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Lecture 13 – Systems Biology & Bioinformatics
Systems Biology Motivation & Basic Terminology Selected Scientific Case Protein Folding Role of Monte Carlo Methods SMMP & Neuroscience Parallel Applications Other Models & Libraries Application Examples
Bioinformatics Motivation & Basic Terminology Selected Scientific Case Gene Sequencing Role of Databases and Web-based Portals BLAST Parallel Application Other Tools & Techniques Application Examples
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Lecture 14 – Molecular Systems & Libraries
Molecular Systems Terminology & Motivation Ab Initio Calculations Molecular Docking & Dynamics Application Examples
Selected Methods & Libraries NAMD CPMD MP2C AMBER Parallel Interoperability
Application
Lecture 0 - Prologue
(force field)
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Lecture 15 – Computational Fluid Dynamics
Computational Fluid Dynamics Terminology & Motivation Naviar-Stokes Method Lattice-Boltzmann Method Large Eddy Turbulence Model Modelling Methodology Revisited Application Examples
Selected Libraries and Methods Fire Dynamics Simulator OpenFOAM HemeLB iFluids Application Examples
Lecture 0 - Prologue
(classical mechanics solutions are rather trajectories
of positions of a certain particle, here fluid velocity is in focus)
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Lecture 16 – Finite Elements Method
Finite Elements Methods Terminology & Motivation Boundary Value Problems Mesh Generation Technique Adaptive Mesh Refinement Application Examples
Selected Libraries and Methods Elmer Code_Aster Salome-Meca Platform Ansys OpenFOAM Revisited Application Examples
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Lecture 17 – Machine Learning & Data Mining
Machine Learning & Data Mining Terminology & Motivation Contrast to High Throughput Computing HPC for Classification,
Clustering & Regression Selected Remote Sensing Use Case Parallel Support Vector Machines HBDBSCAN for Clustering Inverse Problems Relationship to
Parallel I/O Application
Examples
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[Video] High Performance Computing by Dreamworks
Lecture 0 - Prologue
[3] YouTube, Dreamworks
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Course Organization
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UGLA Tool & Office Hours (!)
Reference course information High Performance Computing Forritun Ofurtölva (A) REI105M, spring 2017
Use it for course communication Every course member requires account Contact other students & discuss topics Recorded lectures & contact lecturer
Find course materials Slides & Handouts Further reading topics
(e.g. papers, practical lectures)
Questions, major difficulties, etc.? Don’t wait long! Use my office hours, send meeting request email to [email protected]
Lecture 0 - Prologue
[4] High Performance ComputingUGLA Course Page Online
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Overall Course Organization
3 Assignments (40 %) Guided by practical lectures in context with hands-on elements for all HPC configuration & parallel programming projects Influence in the overall grade TBD(all): Create Groups of 2-3 and send the group to [email protected]
Quizzes (10 %) Small quiz from time to time (pre-announced) to check understanding Jointly minor influence in the overall grade – good preparation for exam
Exam (50 %) End of the lecture series (~December) – major part of the overall grade ‘Not knowing everything is key – but understand the important elements‘
Invited Lectures A couple of presentations (e.g. companies, interesting projects, etc.)
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Associated Literature
Further bibliography and readings will be provided in context
Lecture 0 - Prologue
Introduction to High Performance Computing for Scientists and Engineers,Georg Hager & Gerhard Wellein,Chapman & Hall/CRC Computational Science,ISBN 143981192X, English, ~330 pages, 2010
[5] Introduction to High Performance Computing, 2010
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Jötunn Cluster – HI HPC Service
HPC Service @ University of Iceland Course usage: Small to medium sized computation Every member of the course requires an account
Cluster Setup Nodes: 4 cpu: 2x Intel Xeon
CPU E5-2690 v3 @ 2.60GHz (2.6 GHz, 12 core) Memory: 128GB DDR4 Interconnect: 10 Gb/s ethernet
Software Setup Scheduling: SLURM Monitoring: Ganglia Libraries: MPI, OpenMP
Lecture 0 - Prologue
Every course member receives an account from the HI HPC Service
Service can be asked when serious problems with the scheduling may be experienced:[email protected][6] Jotunn Cluster Online
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[Video] PRACE – What is High Performance Computing
Lecture 0 - Prologue
[7] PRACE, High Performance Computing
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Lecture Bibliography
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Lecture Bibliography
[1] Morris Riedel Web page, Online: http://www.morrisriedel.de
[2] Juelich Supercomputing Centre Web page, Online: http://www.fz-juelich.de/ias/jsc/EN/Home/home_node.html
[3] YouTube Video, Dreamworks, High Performance Computing, Online: http://www.youtube.com/watch?v=TGSRvV9u32M
[4] High Performance Computing UGLA Course Page, Online: https://ugla.hi.is/kv/index2.php?sid=219&namsknr=70067120176&kennsluvefur_efnisatridi=1
[5] Introduction to High Performance Computing for Scientists and Engineers, Georg Hager & Gerhard Wellein, Chapman & Hall/CRC Computational Science, ISBN 143981192X, English, ~330 pages, 2010, Online:http://www.amazon.de/Introduction-Performance-Computing-Scientists-Computational/dp/143981192X
[6] Jötunn HPC Cluster, Online: http://ihpc.is/jotunn/ [7] PRACE – Dare to Think the Impossible, YouTube Video,
Online: http://www.youtube.com/watch?v=fgy-ZkJyom0
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