High-Performance Computing
using Campus Cluster
Please navigate to
uiuc-cse.github.io/hpc-fa14
CSE Training • cse.illinois.edu/training/
Cluster Elements
HPC Strategies
vectorization
single operation across multiple data
distributed computing
multiple units on multiple data for same overall process
local threading
context-switching processes operating over
multiple control flows or multiple data
HPC Architecture
GPGPU
“If you were plowing a field, which would you rather use?
Two strong oxen or 1024 chickens?”
(Seymour Cray)
Linked CPUs
HPC Performance
Speedup
how much faster a parallel algorithm is than its sequential counterpart
S(N, P)=tN,P=1 / tN,P
HPC Performance
Strong Scaling
how the solution time varies with the number of processors P for a fixed total problem size N.
E(N) = t1 / (N tN)
HPC Performance
Weak Scaling
how the solution time varies with the number of processors P for a fixed problem size per processor N/P.
E(N)
= (t1
/ tN)
Writing Scientific Code
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Learn your development environment.
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Write self-documenting code.
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Modularize your code.
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Use standard files: README, INSTALL, CITATION, README
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Use a compilation system.
Use version control and issue-tracking.
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Develop and use a unit-testing scheme.
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Don't reinvent the wheel—find existing libraries.
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Don't hard-code values: use configuration files instead.
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Compile with all debug flags set (-Wall -Werror -g).
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Don't create new file formats.
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Have a long-term data management plan.
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Study strong and weak scaling to not waste cluster cycles.
Debugging Scientific Code
Nobody gets it right the first time, [including you]. (Lynne Williams)
Premature optimization is the root of all evil. (Donald Knuth)
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Confusion is a clue that something is wrong—notice it, don't ignore it. (Eliezer Yudkowsky, paraphrased)
Where can you go next?
http://hpcuniversity.org/roadmap/
Courses
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ECE 408/CS 483 Applied Parallel Programming
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ECE 492/CS 420/CSE 402 Introduction to Parallel Programming
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ECE 428/CS 425/CSE 424 Distributed Systems
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CS 524 Concurrent Programming Languages
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CS 525 Advanced Topics in Distributed Systems
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CS 533 Parallel Computer Architectures
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CS 554/CSE 512 Parallel Numerical Algorithms
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ECE 598HK/CS 598HK Many-Core Computing
MSE 498AF Computational Materials Science and Engineering
HPC-Fa14
By uiuc-cse
