Virtual Institute — High Productivity Supercomputing

25th VI-HPS Tuning Workshop (RWTH, Aachen, Germany)


Monday 27th - Friday 31st March 2017


The workshop will take place in Seminarraum 003 of RWTH Aachen University IT Center extension building, Kopernikusstrasse 6, Aachen, Germany.

Organizing Institutions



This workshop organized by VI-HPS for the German PRACE Advanced Training Centre will:

  • give an overview of the VI-HPS programming tools suite
  • explain the functionality of individual tools, and how to use them effectively
  • offer hands-on experience and expert assistance using the tools

Programme Overview

Presentations and hands-on sessions are planned on the following topics:

  • Setting up, welcome and introduction
  • Score-P instrumentation and measurement
  • Scalasca automated trace analysis
  • Vampir interactive trace analysis
  • Paraver/Extrae/Dimemas trace analysis and performance prediction
  • MAQAO performance analysis & optimisation
  • TAU performance system
  • MUST runtime error detection for MPI
  • ARCHER runtime error detection for OpenMP
  • Extra-P automated performance modeling
  • ... and potentially others

A brief overview of the capabilities of these and associated tools is provided in the VI-HPS Tools Guide.

The workshop will be held in English and run from 09:00 to not later than 18:00 each day, with breaks for lunch and refreshments. For participants from public research institutions in PRACE countries, the course fee is sponsored through the PRACE PATC program. All participants are responsible for their own travel and accommodation.

Classroom capacity is limited, therefore priority will be given to applicants with parallel codes already running on the workshop computer system (CLAIX), and those bringing codes from similar x86 cluster systems to work on. Participants are therefore encouraged to prepare their own MPI, OpenMP and hybrid MPI+OpenMP parallel application codes for analysis.

Participants are expected to use their own notebook computers to connect to the workshop computer systems via SSH: X11 will also be required for the graphical tools.

Programme in Detail

Workshop participants who already have accounts and their application prepared for the CLAIX computer system may wish to skip the optional Monday morning setup session.

Day 1: Monday 27 March
10:00 [Optional] Individual preparation of participants' own codes.
(registration & set-up of accounts on workshop computers)
12:45 (lunch)
14:00 Welcome
  • Introduction to VI-HPS & overview of tools [Brian Wylie, JSC]
  • Introduction to parallel performance engineering [M.-A. Hermanns, JSC]
  • 15:30 (break)
    16:00 Lab setup
  • Computer systems and software environment [Dirk Schmidl, RWTH]
  • Building and running NPB-MZ-MPI/bt-mz on CLAIX [Brian Wylie, JSC]
  • Preparation of participants' own codes on workshop computer systems.
    18:00 (adjourn)

    Day 2: Tuesday 28 March
    09:00 Score-P instrumentation & measurement toolset [Christian Feld, JSC & Bert Wesarg, TUDresden]
  • Score-P hands-on exercises
  • CUBE profile explorer hands-on exercises [Marc-André Hermanns, JSC]
  • 10:30 (break)
    11:00 Score-P analysis scoring & measurement filtering  [Christian Feld, JSC & Bert Wesarg, TUDresden]
  • Measuring hardware counters and other metrics 
  • Scalasca automated trace analysis [Brian Wylie, JSC]
  • Scalasca hands-on exercises
  • 12:45 (lunch)
    13:45 Hands-on coaching to apply tools to analyze participants' own code(s).
    17:30 Review of day and schedule for remainder of workshop
    18:00 (adjourn)
    19:00 Social Event sponsored by PRACE: Restaurant Macaroni, Schmiedstrasse 24, Aachen

    Day 3: Wednesday 29 March
    09:00 Vampir interactive trace analysis [Bert Wesarg, TUDresden]
  • Vampir hands-on exercises
  • 10:30 (break)
    11:00 Paraver tracing tools suite [Judit Giménez & Lau Mercadal, BSC]
  • Paraver hands-on exercises
  • 12:45 (lunch)
    13:45 Hands-on coaching to apply tools to analyze participants' own code(s).
    17:30 Review of day and schedule for remainder of workshop
    18:00 (adjourn)

    Day 4: Thursday 30 March
    09:00 MAQAO performance analysis tools [Cédric Valensi & Emmanuel Oseret, UVSQ]
  • MAQAO hands-on exercises (Quick reference)
  • 10:30 (break)
    11:00 TAU performance system [Sameer Shende, UOregon]
  • TAU hands-on exercises
  • 12:45 (lunch)
    13:45 Hands-on coaching to apply tools to analyze participants' own code(s).
    17:30 Review of day and schedule for remainder of workshop
    18:00 (adjourn)

    Day 5: Friday 31 March
    09:00 MUST MPI runtime error detection [Joachim Protze, RWTH]
  • MUST hands-on exercises
  • ARCHER OpenMP runtime error detection [Joachim Protze, RWTH]
  • ARCHER hands-on exercises
  • 10:30 (break)
    11:00 Extra-P performance modelling [Alexandru Calotoiu, TUDarmstadt]
  • Extra-P hands-on exercises
  • Review
    12:45 (lunch)
    13:45 Hands-on coaching to apply tools to analyze participants' own code(s).
    17:00 (adjourn)

    Hardware and Software Platforms

    CLAIX2016: NEC x86_64 Linux cluster system:

    • 600+ 'MPI' compute nodes each with two Intel Xeon E5-2650v4 'Broadwell' processors (2.2GHz, 12 cores per processor, 2 hardware threads per core) and 128GB shared memory
    • 8 'SMP' compute nodes each with eight Intel Xeon E7-8860v4 'Broadwell' processors (2.2GHz, 18 cores per processor, 2 hardware threads per core) and 1024GB shared memory
    • Intel Omni-Path high performance network; Lustre parallel filesystem
    • software: CentOS 7.2 GNU/Linux, Intel MPI; Intel, GCC and other compilers; LSF batch system

    The local HPC system CLAIX is the primary platform for the workshop and will be used for the hands-on exercises. Course accounts will be provided during the workshop. Participants with accounts on the JURECA cluster and JUQUEEN BlueGene/Q at JSC will also be assisted using those systems. Other systems where up-to-date versions of the tools are installed can also be used when preferred, though support may be limited and participants are expected to already possess user accounts. Regardless of whichever systems they intend to use, participants should be familiar with the relevant procedures for compiling and running their parallel applications (via batch queues where appropriate).


    Register via the PRACE training portal: the number of participants is limited and selection made based on the information provided when registering. Post-workshop evaluation forms for PRACE-sponsored training are accessed via the same page on the portal: all participants are required to provide an evaluation (anonymously)!

    Accommodation in Aachen

    A contingent of rooms at various hotels in Aachen have been reserved until the end of February: after that there's no guarantee desired rooms will still be available. Alternatively consult the full accommodation list.


    Tuning Workshop Series

    Brian Wylie
    Jülich Supercomputing Centre
    Forschungszentrum Jülich GmbH
    Phone: +49 2461 61-6589
    Email: b.wylie [at]

    Local Arrangements

    Agnes Ramalho Mendes
    IT Center
    RWTH Aachen University
    Phone: +49 241 80-29708
    Email: hpcevent [at]


    PRACE This workshop is a PRACE Advanced Training Centre (PATC) course, organised by JSC for the Gauss Centre for Supercomputing.