14th VI-HPS Tuning Workshop (RIKEN AICS, Kobe, Japan)

Date

Tuesday 25th - Thursday 27th March, 2014.

Location

The workshop will take place at RIKEN Advanced Institute for Computational Science (AICS), 7-1-26, Minatojima-minami-machi, Chuo-ku, Kobe, Hyogo, 650-0047, Japan.

How to get to AICS

Organizing Institutions

Goals

This workshop is organized by VI-HPS and RIKEN AICS 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
Scalasca automated trace analysis
Vampir interactive trace analysis
BSC tools for trace analysis and performance prediction

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. To connect to the workshop computer systems, participants are expected to use their own 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 hands-on practical exercises using a Fujitsu PrimeHPC FX10 and/or K computer. 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.

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. Specifics relevant to use of K computer, such as its interconnection network, hardware counters, batch job file staging, etc., will also be covered.

Preliminary programme

Day 1:	*Tuesday 25th March*
09:00	Welcome message [Sato, RIKEN AICS]
09:05	Introduction Introduction to VI-HPS & overview of tools [Wylie, JSC] Introduction to parallel performance engineering [Lücke, GRS] Lab setup Computer systems and software environment Building and running NPB-MZ-MPI/BT-MZ
10:30	(break)
11:00	Instrumentation & measurement with Score-P [Wylie, JSC] Score-P hands-on exercises Execution profile analysis report exploration with CUBE [Lücke, GRS] CUBE hands-on exercises
12:30	(lunch)
13:30	Configuration & customisation of Score-P measurements [Wylie, JSC] Score-P hands-on exercises
15:00	(break)
15:30	Automated trace analysis with Scalasca [Wylie, JSC] Scalasca hands-on exercises Interactive trace analysis with Vampir [Domke, TITech] Vampir hands-on exercises
17:00	Review of day and schedule for remainder of workshop
17:30	(adjourn)

Day 2:	*26th March*
09:00	Hands-on coaching to apply tools to analyze participants' own code(s), with additional presentations and discussions about topics of interest.
14:00	Understanding applications with Paraver and Dimemas [Gimenez, BSC]
16:00	Visit to the K computer (with G8 ECS Project)
17:00	Review of day and schedule for remainder of workshop
17:30	(adjourn)
Day 3:	*27th March*
09:00	Hands-on coaching to apply tools to analyze participants' own code(s), with additional presentations and discussions about topics of interest.
17:00	Review of day and schedule for remainder of workshop
17:30	(adjourn)

Hardware and Software Platforms

pi: Fujitsu PrimeHPC FX10 at Kobe University will be used for the hands-on exercises with accounts provided during the workshop:

96 compute nodes comprised of SPARC64 IXfx processors (1.848 GHz, 16 cores) and 32 GB shared memory, Tofu interconnect
RHEL Server, Fujitsu MPI & compilers,....

K computer: 864 cabinets each with 96 compute nodes and 6 I/O nodes, SPARC64 VIIIfx processors (2.0 GHz, 8-cores), 16 GB node memory, Tofu interconnect, FEFS filesystem, RHEL Server, Fujitsu MPI & compilers. Existing account required!

Other systems where up-to-date versions of the tools are installed may also be used, though support may be limited. Participants are expected to already possess user accounts on non-local systems they intend to use, and should be familiar with the procedures for compiling and running parallel applications on those systems.