ONLINE COURSE – VSC Training Course: Introduction to Hybrid Programming in HPC, June 17-19, 2020

    This course will be delivered as an ONLINE COURSE for remote participation because of the COVID-19 measures enforced by most European governments.

    REGISTRATION is strictly NECESSARY since the details to access the online course will be provided to the registered and accepted attendees only.

    Furthermore, accepted participants will be contacted about two weeks in advance and asked to provide some more data for the hands-on labs that will be needed for user account creation on the VSC clusters. At that time there will also be a short PRE-ASSIGNMENT that has to be completed before the course starts.


    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 both 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.

    Opens external link in new windowContent Levels: Beginners = 0:00h (0%) + Intermediate = 1:00h (8%) + Advanced = 11:00h (92%)
    (Please note that the content levels refer to the originally planned two days face-to-face course.)

    This course is a PRACE training event. It is organized by the VSC Research Center, TU Wien, in cooperation with LRZ, HLRS and RRZE.

    Agenda & Content:

    The online version of the course has been extended to three days (as compared to the originally planned two days face-to-face course) to allow for more time and flexibility with doing the hands-on labs remotely.

    1st day – 17 June 2020

    08:45   Join online
    09:00    Welcome
    09:05    Motivation
    09:15    Introduction
    09:45    Programming Models
    09:50       - MPI + OpenMP
    10:30   Coffee
    11:00       - continue: MPI + OpenMP
    12:00          Practical (how to compile and start)
    13:00   Lunch
    14:30          Practical (hybrid through OpenMP parallelization)
    16:00   End of first day

    2nd day – 18 June 2020

    08:45   Join online
    09:00       - Overlapping Communication and Computation
    09:30          Practical (taskloops)
    10:30   Coffee
    11:00       - MPI + OpenMP Conclusions
    11:15       - MPI + Accelerators
    11:45    Tools
    12:00    Programming Models (continued)
    12:05       - MPI + MPI-3.0 Shared Memory
    13:00   Lunch
    14:30          Practical (replicated data)
    16:00   End of second day

    3rd day – 19 June 2020

    08:45   Join online
    09:00       - MPI Memory Models and Synchronization
    09:40       - Pure MPI
    10:00       - Recap - MPI Virtual Topologies
    10:30   Coffee
    11:00       - Topology Optimization
    11:30          Practical/Demo (application aware Cartesian topology)
    12:30       - Topology Optimization (Wrap up)
    12:45     Conclusions
    13:00   Lunch
    14:30     Finish the hands-on labs, Discussion, Q & A, Feedback
    16:00   End of third day (course)


    Basic MPI and OpenMP knowledge as presented, e.g., in our VSC Training Courses on MPI and OpenMP.
    For the hands-on sessions you should know Unix/Linux and either C/C++ or Fortran.


    Georg Hager (RRZE / HPC, Uni. Erlangen), Rolf Rabenseifner (HLRS, Uni. Stuttgart),
    Claudia Blaas-Schenner and Irene Reichl (VSC Research Center, TU Wien)



    Date, Time, and Location:

    17. - 19.06.2020, 09:00 - 16:00, ONLINE COURSE


    The course is fully booked!

    If you would like to be added to the waiting list please send an email to:

    Registration period is from 30 March 2020 to 2 June 2020, and follows the "first come – first served" principle.
    For the online course we can take a maximum of 40 persons.
    Additional registrations will be added to a waiting list.


    This course is a PRACE Training Center (PTC) event. Therefore, the course is free of charge for all participants from the EU or from Opens external link in new windowPRACE-member countries.


    Course Material:

    All course material will be made available here at course start.

    The details to access the online course will be provided to the registered and accepted attendees only.


    Local Organizer / Contact:

    Claudia Blaas-Schenner,


    Training events (further courses) at:

    VSC: Opens external link in new

    HLRS: Opens external link in new