Most HPC systems are clusters of shared memory nodes. To use such systems efficiently both memory consumption and communication time has to be optimized. Therefore, hybrid programming may combine the distributed memory parallelization on the node interconnect (e.g., with MPI) with the shared memory parallelization inside of each node (e.g., with OpenMP or MPI-3.0 shared memory).
This course analyzes the strengths and weaknesses of several parallel programming models on clusters of SMP nodes. Multi-socket-multi-core systems in highly parallel environments are given special consideration. MPI-3.0 has introduced a new shared memory programming interface, which can be combined with inter-node MPI communication. It can be used for direct neighbor accesses similar to OpenMP or for direct halo copies, and enables new hybrid programming models. These models are compared with various hybrid MPI+OpenMP approaches and pure MPI.
Numerous case studies and micro-benchmarks demonstrate the performance-related aspects of hybrid programming. Hands-on sessions are included on all days. Tools for hybrid programming such as thread/process placement support and performance analysis are presented in a "how-to" section.
This course provides scientific training in Computational Science and, in addition, the scientific exchange of the participants among themselves.
This course is a joint training event of EuroCC@GCS and EuroCC-Austria, the German and Austrian National Competence Centres for High-Performance Computing. It is organized by the HLRS in cooperation with the VSC Research Center, TU Wien and NHR@FAU.
This hybrid event will take place online and at HLRS, University of Stuttgart Nobelstraße 19 70569 Stuttgart, Germany Room 0.439 / Rühle Saal Location and nearby accommodations
21. Jan 2025 08:45
23. Jan 2025 16:30
Hybrid Event - Stuttgart, Germany
Englisch
Fortgeschritten
Paralleles Programmieren
Programmiersprachen für wissenschaftliches Rechnen
MPI
MPI+OpenMP
OpenMP
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Learn more about course curricula and content levels.
Claudia Blaas-Schenner (VSC Research Center, TU Wien and EuroCC-Austria), Georg Hager (NHR@FAU, Uni. Erlangen), Rolf Rabenseifner (HLRS, Uni. Stuttgart)
The presentation times listed in the agenda are tentative.
1st day – 21 January 2025 --- PRELIMINARY AGENDA ---
08:45 Join in 09:00 Welcome 09:10 Hunter's hardware architecture and its programming models Dr. Christian Simmendinger (HPE) and Igor Pasichnyk (AMD) 10:00 Break 10:15 Introduction to the general MPI+X course with exercises 11:00 Programming Models 11:05 - MPI + OpenMP 11:45 Practical (how to compile and start) 12:30 Lunch 14:00 - continue: MPI + OpenMP 14:45 Break 15:00 - continue: MPI + OpenMP 15:45 Practical (how to do pinning) 16:15 Q & A 16:30 End of first day
2nd day – 22 January 2025
08:45 Join in 09:00 - continue: MPI + OpenMP 09:00 Practical (hybrid through OpenMP parallelization) 10:30 Break 10:45 - Overlapping Communication and Computation 11:15 Practical (taskloops) 12:15 - MPI + OpenMP Conclusions 12:30 Lunch 14:00 - MPI + Accelerators 15:00 Break 15:15 - MPI + Accelerators (continued) 16:15 Q & A 16:30 End of second day
3rd day – 23 January 2025
08:45 Join in 09:00 Programming Models (continued) 09:05 - MPI + MPI-3.0 Shared Memory 10:00 Break 10:15 - MPI Memory Models and Synchronization 11:00 Break 11:15 - Pure MPI 11:35 - Recap - MPI Virtual Topologies 12:05 - Topology Optimization 12:30 Lunch 14:00 - Topology Optimization, continued 14:10 Conclusions 14:25 Practical (replicated data) 15:45 Q & A, Feedback 16:00 Q & A 16:30 End of third day (course)
A link to the course material (slides and exercises) will be available at course start
Register via the button at the top of this page (will be available soon). This course will be hybrid, i.e. it will take place at HLRS on-site but it will also be possible to attend online. Participants, online as well as on-site, have to be aware and agree that they might appear in the live video stream taken by a camera in the back of the lecture room or by a webcam on laptops. We strongly recommend to attend this course on-site since on-site attendance is much more effective and efficient in our experience. Therefore we might give priority to on-site over online participants during registration.
Please be aware that the Zoom session will be recorded. You declare that you are aware of and consent to the recording by registering.
Registration closes on Friday 27 Dec 2024.
Students without Master's degree or equivalent. Participants from EU or EuroCC countries only: 0 EUR PhD students or employees at a German university or public research institute: 0 EUR PhD students or employees at a university or public research institute in an EU or EuroCC country other than Germany: 0 EUR. Other participants, e.g., from industry, other public service providers, or government. Participants from EU or EuroCC countries only: 0 EUR
Our course fee includes coffee breaks (in classroom courses only).
For lists of EU and EuroCC countries have a look at the Horizon Europe and EuroCC website.
Only participants from institutions belonging to these countries can take part in this course.
Maksym Deliyergiyev phone 0711 685 87261, maksym.deliyergiyev(at)hlrs.de
HLRS is part of the Gauss Centre for Supercomputing (GCS), together with JSC in Jülich and LRZ in Garching near Munich. EuroCC@GCS is the German National Competence Centre (NCC) for High-Performance Computing. HLRS is also a member of the Baden-Württemberg initiative bwHPC.
This course is provided within the framework of EuroCC2 and the bwHPC training program.
This is a joint training event of EuroCC@GCS and EuroCC-Austria.
Besides the content of the training itself, an important aspect of this event is the scientific exchange among the participants. We try to facilitate such communication by
See the training overview and the Supercomputing Academy pages.
November 04 - Dezember 06, 2024
Online (flexible)
Dezember 02 - 05, 2024
Online by JSC
Januar 13 - 31, 2025
Februar 17 - 21, 2025
Stuttgart, Germany
März 17 - 21, 2025
Dresden, Germany
