Introduction to the LIKWID tool suite (online)

Section outline

• Select section General Information

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  General Information

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  LIKWID stands for "Like I Knew What I'm Doing." It is a tool suite for performance-aware programming on modern clusters. LIKWID is in use at many computing centers worldwide and can be employed on the full spectrum of platforms, from laptop to supercomputer.

  LIKWID comprises a variety of command-line tools and follows the UNIX philosophy of "one tool, one purpose." In this course, we will cover the following tools in depth:

  • likwid-topology, a node-level topology exploration tool
  • likwid-pin, for enforcing thread-core affinity in thread-parallel programs
  • likwid-mpirun, for starting MPI and MPI/OpenMP-hybrid programs and enforcing thread-core affinity
  • likwid-perfctr, for counting hardware events and measuring derived metrics
  • likwid-bench, a microbenchmarking framework

  A strong focus will be on diagnostic performance engineering using hardware performance counters on real application codes. Hands-on exercises will enable attendees to consolidate the acquired knowledge.

  Requirements

  • Basic understanding of parallel programming with MPI and OpenMP
  • Fluency on the Linux command line
  • Editing files through ssh connection via vim, emacs, nano, ...
  • A current web browser since system access is provided through Jupyter notebooks.

  
  

  Instructors

  Thomas Gruber and Georg Hager (NHR@FAU)

  This course is organized by Erlangen National High Performance Computing Center (NHR@FAU)

  Time & Date

  July 23, 2024, 9:30 a.m. - 4:30 p.m. CEST

  
  

  
  

  • Select activity General remarks

    

    General remarks File PDF
  • Select activity Logging in

    

    Logging in Page
• Select section Topology and Affinity

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  Topology and Affinity

  • Select activity Slides: likwid-topology, likwid-pin, likwid-setFrequencies

    

    Slides: likwid-topology, likwid-pin, likwid-setFrequencies File PDF
  • Select activity Hands-on: likwid-topology, likwid-pin

    

    Hands-on: likwid-topology, likwid-pin Page
• Select section Hardware Performance Counters

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  Hardware Performance Counters

  • Select activity Slides: Hardware Performance Counters

    

    Slides: Hardware Performance Counters File PDF
  • Select activity Short description of the MFPCG solver

    

    Short description of the MFPCG solver File PDF
  • Select activity Hands-on: Hardware Performance Counters

    

    Hands-on: Hardware Performance Counters Page
• Select section ccNUMA

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  ccNUMA

  • Select activity Hands-on: ccNUMA (Part 1)

    

    Hands-on: ccNUMA (Part 1) Page
  • Select activity Slides: ccNUMA

    

    Slides: ccNUMA File PDF
  • Select activity Hands-on: ccNUMA (Part 2)

    

    Hands-on: ccNUMA (Part 2) Page
• Select section Microbenchmarking

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  Microbenchmarking

  • Select activity Slides: Microbenchmarking

    

    Slides: Microbenchmarking File PDF
  • Select activity Hands-on: Empirical Roofline Model

    

    Hands-on: Empirical Roofline Model Page
  • Select activity Gnuplot script for Empirical Roofline Model with LIKWID

    

    Gnuplot script for Empirical Roofline Model with LIKWID File PLOT
• Select section Feedback

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  Feedback

  Please fill out the feedback form at:

  https://survey.nhr.fau.de/index.php/567395?lang=en