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Efficient Parallel Programming with GASPI

Room 1.067 / Medienlabor HLRS (Höchstleistungsrechenzentrum Stuttgart), Universität Stuttgart, Nobelstr. 19, D-70569 Stuttgart


2014, Thursday, Jan. 30, 10:45 - 16:00


In this tutorial we present an asynchronous dataflow programming model for Partitioned Global Address Spaces (PGAS) as an alternative to the programming model of MPI.
GASPI, which stands for Global Address Space Programming Interface, is a partitioned global address space (PGAS) API. The GASPI API is designed as a C/C++/Fortran library and focused on three key objectives: scalability, flexibility and fault tolerance. In order to achieve its much improved scaling behaviour GASPI aims at asynchronous dataflow with remote completion, rather than bulk-synchronous message exchanges. GASPI follows a single/multiple program multiple data (SPMD/MPMD) approach and offers a small, yet powerful API (see also and
GASPI is successfully used in academic and industrial simulation applications.
Hands-on sessions (in C and Fortran) will allow users to immediately test and understand the basic constructs of GASPI.
This course provides scientific training in Computational Science, and in addition, the scientific exchange of the participants among themselves.


10:45-11:00 Registration
11:00-12:00 General introduction to GASPI
12:00-12:45 One sided communication in GASPI
12:45-13:45 Lunch
13:45-14:10 Memory segments in GASPI
14:10-14:30 GASPI collectives
14:30-14:50 Coffee Break
14:50-15:20 Data Flow in GASPI
15:20-15.40 Failure tolerance and passive communication in GASPI
15:40-16:00 Questions and Answers




Dr. Christian Simmendinger, T-Systems Solutions for Research GmbH
Dr. Mirko Rahn, Fraunhofer ITWM
Dr. Daniel Gruenewald, Fraunhofer ITWM


via online registration form.

Please book Course 2014-GASPI.


for registration is Jan. 26, 2014 (extended deadline).


Members of German universities and public research institutes: none.
Members of universities and public research institutes within Europe or PRACE: none.
Members of other universities and public research institutes: 120 EUR.
Others: 200 EUR.
(includes food and drink at coffee breaks, will be collected on the first day of the course, cash only)


Unix / C or Fortran


HLRS is part of the Gauss Centre for Supercomputing (GCS), which is one of the six PRACE Advanced Training Centres (PATCs) that started in Feb. 2012.
HLRS is also member of the Baden-Württemberg initiative bwHPC-C5.
This course is provided within the framework of the bwHPC-C5 user Support. This course is not part of the PATC curriculum and is not sponsored by the PATC program.


Additional information can be found, e.g., at and

Travel-Info Stuttgart

See HLRS address and travel-info. The next public transport stations are: "Universität, Stuttgart" (S-Bahn station, 15 min on foot) and "Lauchhau, Stuttgart" (Bus station, 4 min on foot to HLRS, bus lines 84, 92, 746, 747, 748, but not 82! from S-Bahn station "Universität, Stuttgart" and bus line 81 from S-Bahn station "Stuttgart-Vaihingen").
Accomodation: see HLRS accomodation-info. Private Bed&Breakfast is also available (might be cheaper than the hotels), e.g., A DJH youth hostel is also available.
Further links: Online-Stadtplan des Stadtmessungsamtes Stuttgart or

Local Organizer

Jutta Oexle phone 0711 685 87207, oexle[at]

Cancelation Policy

If you cannot come to the course, please send an email to the organizer as soon as possible. This would allow us to accept additional participants from the waiting-list. There is no cancelation fee.
NO-SHOW: Registered persons that do not cancel and do not show up without any reasons are blocked for the next year on any of our workshops (because it is too expensive to produce unused copies of the slides for them).


Each participant will get a paper copy of all slides.

Shortcut-URL of this course:


Jutta Oexle phone 0711 685 87207, oexle[at]