Jülich Supecromputing Centre, Rotunda, building 16.4, room 301
JUQUEEN is JSC's large special purpose supercomputer, an IBM Blue Gene/Q with 5.9 Petaflop/s. Although production on JUQUEEN started more than two years ago, users still need to make special efforts in order to get the most out of this unique research tool and get accustomed to the hard- and software.
Each year the workshop also focuses on one special user group with additional parallel talks and closer support (this does not exclude other users). The third workshop in this series invites users from earth system modelling. This will be supported by our Simulation Laboratories for Climate Science and Terrestrial Systems.
The aim of this hands-on workshop is to support current users of JUQUEEN in porting their software, in analysing its performance, and in improving its efficiency. The workshop topics start with an introduction to JUQUEEN's hard- and software and related best practices. It will also explain the available performance and debugging tools and explain parallel I/O with its data formats. Special topics may then provide more in-depth knowledge on specific BG/Q features such as prefetching, SIMDsation with QPX, low-level networking, and active storage as well as topics close to earth system modelling.
It is highly recommended that project PIs send at least one expert on their code to this workshop.
Prerequisites
Participants should belong to a currently active simulation project on JUQUEEN (project-ID!) and should already have an active user account (user-id!). Test runs during the workshop will be done on the participants' own project accounts.
In order to gain maximum benefit from this workshop, participants should have an in-depth (hands-on) knowledge of the algorithms and codes used in their project.
In addition, we also ask participants to prepare a test case to evaluate the initial performance of their code and to monitor the progress.
Registration
Registrations are only considered until 19 December 2014.
Note that in the application form we ask some information about your project and code in order to better plan the workshop program. This workshop is a PRACE Advanced Training Centres course (PATC). The application form is provided on the PRACE website.
Due to available space, the maximal number of participants is limited. Participants will be notified early in January 2015.
Agenda
All talks will be in the Rotunda (building 16.4, room 301). The hands-on sessions will take place in a Computer Lab (building 16.3, room 021). Talks marked with a * are for the special interest group from earth system modelling.
Markus Geimer, JSC Performance tools and debuggers
12:00-12:30
Paul Gibbon, JSC Support structure at JSC
12:30-13:30
Lunch break
13:30-17:00
Hands-on session
15:00
Coffee break
16:00-17:00 *
Earth system modelling groups * Presentation of the earth system modelling codes:
Klaus Görgen, JSC Some JUQUEEN geoscience usage examples from SimLab TerrSys
Guowei He, IBG-3 Data assimilation with TerrSysMP
Hedieh Ebrahimi, Amphos21 Use of PFLOTRAN on JUQUEEN - A User's Perspective
Tobias Schruff, RWTH (IWW) Fluid-Particle Multiphase Flow Simulations for the Study of Sand Infiltration into Immobile Gravel-Beds
17:00-17:30
Feedback and first experiences
17:35-17:53
Bus SB20 from Forschungszentrum "Seecasino" to Jülich "Neues Rathaus"
17:40-17:53
Bus SB220 from Forschungszentrum "Seecasino" to Jülich "Neues Rathaus"
18:30
Social event (dinner at a restaurant in Jülich)
Day 2, Tuesday, 3 February 2015
Time
Session
08:13-08:33
Bus SB20 from Jülich "Neues Rathaus" to Forschungszentrum Jülich "Seecasino"
09:00-12:30
Hands-on session
09:00-10:00
Sebastian Lührs, Kay Thust, JSC Parallel I/O
10:00-10:30
Dirk Pleiter, JSC Realising active storage concepts on BlueGene/Q
10:30-11:00
Coffee break
11:00-11:30
Thorsten Hater, JSC Multithreading with OpenMP
11:30-12:00
Stefan Krieg, JSC Advanced features fo BG/Q via intrinsics
12:30-13:30
Lunch break
13:30-17:00
Hands-on session
13:30-14:00
Alberto F. Martin, CIMNE Scaling up Multilevel Domain Decomposition to the full JUQUEEN supercomputer
14:00-15:00*
Earth system modelling groups * Presentation of the earth system modelling codes:
Catrin Meyer, JSC Performance Analysis of the Climate Model ICON for the Project "High Definition Clouds and Precipitation for advancing Climate Prediction (HDCP2)"
Thomas Jahns, DKRZ ICON from a non-scientist's perspective
Jonas Berndt, IEK-8 Short range ensemble meteorological forecasting for estimating available wind energy
Jülich Supercomputing Centre (JSC) Institute for Advanced Simulation (IAS) Forschungszentrum Jülich GmbH D-52425 Jülich, Germany
Access to Forschungszentrum Jülich
To access JSC you first need to sign up as a visitor to Forschungszentrum Jülich. We will have provided the necessary data and information to our Visitors' Reception. Please note, however, that each participant must present a valid identity card or passport to be able to enter the Forschungszentrum.
If you make use of the shuttle service, entering though the gate will be much easier and prepared for. If this is not the case and you arrive on your own, please go to the Visitors' Reception at the main gate and mention the JUQUEEN workshop and the local contact Dirk Brömmel.
Once you arrive at JSC, you can then register for the workshop.
Access to JUQUEEN
The hands-on sessions will take place in our computer labs and we encourage everyone to make use of the provided workstations. The benefit will be a more stable connection and better usability of the graphical tools we provide on JUQUEEN.
The workstations in our labs do require a separate user account and you will have received details of this account before you come to Juelich. This account will only be valid for the time of the workshop and will be deleted afterwards.
Since you will be using your project's compute time resources on JUQUEEN, please make sure that logging in to our HPC systems with your project account is possible. As you know, this requires ssh-key authentication.
You have two possibilities to achieve this:
You will have received the public key of your personal computer lab account via email. You should make this key known to JUQUEEN. In order to enable log-ins with this key, copy it to your $HOME on JUQUEEN and execute the following command:
cat ${HOME}/id.pub >> ${HOME}/.ssh/authorized_keys (Or an appropriate line if you changed the path or filename.)
As an alternative, at the expense of spreading your private data: Copy the private ssh-key you already use and that matches the public key on JUQUEEN to the computer lab account. This can be done during the workshop provided you have access to your private key (e.g. via scp or on a USB key).
Wireless access at JSC
If you wish to connect to our wireless network during the workshop, your laptop will have to be registered first. Please email us the hardware address (MAC) of your wireless network card (e.g. 01:23:45:67:89:ab). Alternatively, access can also be granted once you are here.
Accomodation
Participants are responsible for booking their own hotel accommodation. A regular bus service (line SB11) connects Aachen, Jülich and the Forschungszentrum.
Walking distance from Jülich train station: 15 min
You can see the bus route, the hotels and the restaurant (red dot 'D' for dinner) on the map below. To identify your nearest stop (yellow circles) follow the link and look for bus route SB11.