Das ZIH-Kolloquium ist eine öffentliche Veranstaltung. Es
findet regelmäßig am 4. Donnerstag eines Monats um 15:00 Uhr
im Willers-Bau A317 statt.
Bei zusätzlichen oder außerplanmäßigen Veranstaltungen sind
Zeit und Örtlichkeit explizit angegeben.
Nächster Termin
23. Mai 2013: Horst Malchow (Universität
Osnabrück, Institut für Umweltsystemforschung): "Pattern
formation in non-equilibrium systems" The exploration of
pattern formation mechanisms in nonlinear complex systems is
one of the central scientific problems. The development of
the theory of self-organized temporal, spatial or functional
structuring of nonlinear systems far from equilibrium has
been one of the milestones of structure research. The
occurrence of multiple steady states and transitions from
one to another after critical fluctuations, the phenomena of
excitability, oscillations, waves and, in general, the
emergence of macroscopic order from microscopic interactions
in various nonlinear nonequilibrium systems in nature and
society has required and stimulated many theoretical and, if
possible, experimental studies.
Mathematical and computational modelling has turned out to be
one of the useful methods to improve the understanding of such
structure generating mechanisms. After a more general
introduction, examples from population dynamics are
presented.
Weitere Termine
13. Juni 2013:zusätzliches Kolloquium mit Scott
Michael (SciApT, Indiana University): "The Power of User
Statistics: Using analytics to improve service to end
users"
In this talk I will present an overview of the statistics
tracking system developed for use on supercomputing platforms
by the Research Technologies division at Indiana University
(IU). Combining and viewing statistical data from many sources
including multiple compute platforms, high performance file
systems, archive systems, can be a daunting task. Finding
useful and actionable information in this data presents an even
greater challenge. However, by aggregating data from multiple
resources we have been able to gain a more comprehensive view
of users activity and identify users whose workflows could be
improved. In addition to describing the basic design and
infrastructure of the system, I will present several use cases
where we have been able to improve user experience and increase
the usage efficiency of IU supercomputing resources.
13. September 2013:zusätzliches Kolloquium mit
Howard Jay Siegel, Anthony A. Maciejewski (Colorado State
University)
26. September 2013: Davi Böhme (GRS
Aachen)
24. Oktober 2013: Sascha Hunold (TU Wien)
Vergangene Termine
25. April 2013: Wolfgang Frings (FZ Jülich) "SIONlib:
Scalable Massively Parallel I/O to Task-Local Files"
Parallel applications often store data in multiple task-local
files, for example, to create checkpoints, to circumvent memory
limitations, or to record performance data. When operating at
very large processor configurations, such applications often
experience scalability limitations when the simultaneous
creation of thousands of files causes metadata-server
contention. Furthermore, large file counts complicate the file
management and operations on those files can even destabilize
the file system. Even if a parallel I/O library is used and
task-local files are replaced by a single shared file, new
meta-data bottlenecks will be observed especially at very large
scale. This talk will introduce SIONlib, a parallel I/O library
that addresses also those new bottlenecks by transparently
mapping a large number of task-local files onto a small number
of physical files via internal metadata handling and by block
alignment to ensure high performance. By discussing the design
principles of SIONlib we address also the challenges that will
arise on upcoming exascale systems and show how they could be
solved with a software-only approach.
28. März 2013: Ulrich Kähler(DFN) "Die Authentifizierung-
und Autorisierungs-Infrastruktur des Deutschen Forschungsnetzes
(DFN-AAI)- - sicherer und einfacher Zugang zu geschützten
Ressourcen"
Der DFN-Verein betreibt eine Authentifizierung- und
Autorisierungs-Infrastruktur (DFN-AAI), um Nutzern von
Einrichtungen aus Wissenschaft und Forschung (Teilnehmer) über
das Wissenschaftsnetz einen Zugang zu geschützten Ressourcen
(z.B. wissenschaftlichen Veröffentlichungen, lizenzpflichtiger
Software, Großrechnern, GRID-Ressourcen) von Anbietern zu
ermöglichen. Nutzer, die auf geschützte Ressourcen zugreifen
wollen, können sich an ihrer Heimateinrichtung authentifizieren
und nach Übertragung der zur Autorisierung notwendigen Daten
(Attribute) Zugang zu den Ressourcen erlangen.
Der DFN-Verein koordiniert in Rücksprache mit den Teilnehmern
und Anbietern die Modalitäten und Richtlinien für die
Kommunikation innerhalb der DFN-AAI und passt sie dem
technischen Fortschritt an.
28. Februar 2013: Andreas Dress (Bielefeld) "Modelling,
Simulating and Analysing Structure Formation in Tissue and in
Cellular Automata"
Structure formation has fascinated mankind ever since
antiquity. And, after the introduction of infinitesimal
calculus, partial differential equations appeared for a long
time to constitute the only proper mathematical methodology to
generate and analyse spatio-temporal models of structure
formation. So, it came as a slight surprise that even rather
coarse-grained and simplistic CA-type models could capture
essential features of structure formation processes. In the
lecture, I will first recall how we first learned about this
almost 30 years ago when, jointly with Martin Gerhardt, Nils
Jaeger, Peter Plath, and Heike Schuster, we tried to analyse
heterocatalytic processes on metal surfaces and, this way,
discovered that such processes might potentially form
interesting spatial-temporal patterns -- a finding that was
confirmed only later by Ronald Imbihl in a number of beautiful
experiments (now in Hannover, then working at Gerhard Ertl's
lab in Berlin). I will then go on to present various CA-type
models that were later developed jointly with Peter Serocka at
Bielefeld in the 1990s and clearly exhibited striking phase
transitions in "pattern space", going e.g. from patterns of
ever turning spirals to patterns of "growing, intermingling,
and solidifying empires" upon one slight change of parameters
for one time step, only, -- thus furnishing intriguing
metaphors for the onset and establishment of e.g. cancer in
healthy tissue caused (perhaps) by a slight disturbance of cell
metabolism. Finally, I will turn to a mathematical analysis of
certain CA dynamics and discuss some mathematical tools like
discrete Fourier transforms that, as was recently shown by LIN
Wei from Fudan U, can be used to treat at least some aspects of
these models in proper mathematical terms.
zusätzliches Kolloquium am 7. Februar 2013, 15 Uhr
WILA317: Ivo Sbalzarini (Max-Planck-Institut für Molekulare
Zellbiologie und Genetik, Zentrum für Systembiologie Dresden) -
The Parallel Particle Mesh (PPM) library and a domain-specific
language for particle methods
Particle methods provide a unifying framework for simulations
of both discrete and continuous models. We present the PPM
library, a scalable and transparent middleware for hybrid
particle-mesh simulations on distributed-memory parallel
computers. We discuss recent progress in hybrid
multi-threading/multi-processing and adaptive-resolution
simulations. In addition, we present a domain-specific language
for parallel particle-mesh methods and the associated compiler
and programming environment.
24. Januar 2013: Andre Brinkmann (Johannes
Gutenberg-Universität Mainz) "HPC Storage: Challenges and
Opportunities of new StorageTechnologies" (Folien)
Storage systems have been regarded as a necessary, but mostly
uninteresting component of high performance computers. Several
trends are currently changing this role.
First of all, the amount of data written and read from HPC
storage is increasing at an incredible speed even in the domain
of traditional HPC. While, e.g., checkpointing has been a
common, but feasible task in mid-sized cluster environments, it
becomes extremely costly and frequent in multi-petabyte
installations. A second trend is that several new data centric
applications from the life science and physics domain appear
and that HPC is widening its realm to include these
applications from the field of big data and data analytics.
This new role of storage is reinforced by a widening
performance gap between processors and traditional hard
disks.
This talk will cover several techniques to use existing hpc
storage more efficiently and to include big data solutions
within an HPC center as well as approaches to include new
storage technologies, like flash and phase-change memory in the
HPC stack.
servicedesk@tu-dresden.de