Virtual Institute – High Productivity Supercomputing

23rd VI-HPS Tuning Workshop (LLNL, Livermore/CA, USA) - Performance Tool Deep-dive Workshop

Date

Wednesday 27th - Friday 29th July, 2016.

Location

The workshop will take place at the Lawrence Livermore National Laboratory, Livermore/CA, USA.

Organizing Institution

LLNL

Goals

This workshop is organized by VI-HPS to:

  • 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

On completion participants should be familiar with common performance analysis and diagnosis techniques and how they can be employed in practice (on a range of HPC systems). Those who prepared their own application test cases will have been coached in the tuning of their measurement and analysis, and provided optimization suggestions.

Programme Overview

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

  • Score-P instrumentation and measurement
  • CUBE analysis report exploration and processing
  • Scalasca automated trace analysis
  • Vampir interactive trace analysis
  • MUST runtime error detection for MPI
  • ARCHER runtime error detection for OpenMP
  • MAQAO performance analysis and optimization

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. There is no fee for participation, however, participants are responsible for their own travel and accommodation.

Classroom capacity is limited, therefore priority will be given to applicants with MPI, OpenMP and hybrid OpenMP+MPI parallel codes already running on the workshop computer systems, and those bringing codes from similar systems to work on. Workstations are provided to connect to the workshop computer systems, however, (eduroam) wifi will be available so participants could also use personal notebook computers with SSH and X11 configured.

Outline

The workshop introduces the open-source community-developed Score-P instrumentation and measurement infrastructure, and the Scalasca and Vampir tools using it, to provide a practical basis for portable performance analysis of parallel applications. It will be delivered as a series of presentations with associated tools demonstrations. Starting with basic application instrumentation and measurement to generate execution profiles, then improving measurement quality via customization capabilities, progresses to interactive and automated analyses of execution traces. The MUST and ARCHER tools for MPI and OpenMP correctness checking and MAQAO tool for x86 performance analysis and optimization complete the agenda.

While analysis of provided example codes will be used to guide the class through the relevant steps and familiarise with usage of the tools, coaching will also be available to assist participants to analyse their own parallel application codes and may suggest opportunities for improving their execution performance and scalability.

Preliminary programme

Day 1: Wednesday 27th July
09:30 Welcome message [Martin Schulz, LLNL]
  • Introduction to VI-HPS & overview of tools [Martin Schulz, LLNL]
  • Introduction to parallel performance engineering [Christian Feld, JSC]
  • Building and running NPB-MZ-MPI/BT-MZ on Cab [Christian Feld]
  • Instrumentation & measurement with Score-P [C. Feld & B. Wesarg]
  • Profile analysis report exploration with CUBE [David Böhme, LLNL]
  • Configuring & customising Score-P measurements [C. Feld & B. Wesarg]
  • Automated trace analysis with Scalasca [David Böhme, LLNL]
  • Interactive trace analysis with Vampir [Bert Wesarg, TUDresden]
  • 12:00
    (lunch)
    13:00 Hands-on coaching to apply tools to analyze participants' own code(s).
  • Score-P cheat sheet
  • 17:30 (adjourn)

    Day 2: Thursday 28th July
    09:30 Résumé/Resume [Martin Schulz, LLNL]
  • x86 performance analysis & optimization with MAQAO [Cédric Valensi & Emmanuel Oseret , UVSQ]
  • MPI runtime error detection with MUST [Joachim Protze, RWTH]
  • OpenMP runtime error detection with ARCHER [Joachim Protze, RWTH]
  • Review of VI-HPS tools presentations [Christian Feld, JSC]
  • 12:00
    (lunch)
    13:00 Hands-on coaching to apply tools to analyze participants' own code(s).
  • MAQAO quick reference sheet
  • 17:30 (adjourn)

    Day 3: Friday 29th July
    09:30 Hands-on coaching to apply tools to analyze participants' own code(s).
    12:00
    (lunch)
    13:00 Hands-on coaching to apply tools to analyze participants' own code(s).
    16:00 (adjourn)

    Registration

    Contact one of the local organizers below.

    Contact

    Local Arrangements

    Martin Schulz
    Center for Applied Scientific Computing,
    Lawrence Livermore National Lab.
    E-mail: schulzm[at]llnl.gov
        David Böhme
    Center for Applied Scientific Computing,
    Lawrence Livermore National Lab.
    Email: boehme3[at]llnl.gov

    Tuning Workshop Series

         Brian Wylie
         Jülich Supercomputing Centre
         Email: b.wylie[at]fz-juelich.de