Seminare 2016

Wie in den vorangegangenen Jahren wird das CCCS auch 2016 während des Semesters monatliche Forschungsseminare durchführen. Die Seminare finden üblicherweise jeweils am ersten Dienstag der Monate März, April und Mai (Frühjahrssemester) sowie Oktober, November und Dezember (Herbstsemester) statt. Zusätzliche Extra-Seminare können arrangiert werden.

Wir haben den Seminarraum im "Schnitz" an der Rosshofgasse (Petersgraben 51) reserviert; die Seminarvorträge finden jeweils über Mittag statt (ca. 12:10-13:15 Uhr).

Die CCCS Seminare sind seit Herbstsemester 2015 für Studierende via MOnA belegbar: Vorlesungsnummer 41270-01, Computational Sciences - Anwendungsgebiete, 1 ECTS. Weitere aktualisierte Angaben dazu finden sich im Vorlesungsverzeichnis der Uni Basel.

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14./15. März 2016, H. Harbrecht, Departement Mathematik & Informatik, Uni Basel

Titel: BIOTOP-Workshop on Boundary Elements and Adaptivity

Weitere Angaben: (Seminarraum 05.001, Spiegelgasse 5, 4051 Basel)
Ein Tag der zweitägigen SNF-Veranstaltung wird als CCCS Symposium durchgeführt.

Abstract: Various problems in science and engineering can be formulated as boundary integral equations. These are numerically solved by the boundary element method. For example, the boundary element method is the favourable approach for the treatment of exterior boundary value problems, as the infinite expansion of the domain does not pose a problem for the discretization anymore. This is particularly desirable for simulations in electromagnetics or in case of the Helmholtz equation.

The solution of a boundary integral equation often exposes local features, like for example edge or vertex singularities. Thus, adaptive procedures become important to automatically refine, coarsen, or relocate a mesh to generate the solution with a given target accuracy in optimal fashion. This workshop intends to bring together leading experts in adaptive boundary element methods.

Link to the workshop website with schedule & list of speakers

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05. April 2016, F. Ciorba, Departement Mathematik & Informatik, Uni Basel

Ort: Alte Unversität, Besprechungsraum 003, Rheinsprung 9/11, 4051 Basel

Titel: Performance Modeling & Optimization in High Performance Computing

Abstract: High performance computing (HPC) embodies sequential, parallel, and distributed computers. Parallel and distributed high performance computing systems are increasing in size (in terms of node and core count) and diversity (e.g., core types per node), leading to an increase in their complexity and available parallelism. The increased complexity and parallelism result in situations where the system (understood as the computing hardware and the applications it executes) performance degrades. Modeling system behavior is key to understanding what affects the performance (response time) of HPC systems. Performance modeling is instrumental in preventing performance degradation and optimizing the use of HPC systems. In this talk we will review previous work on achieving robust execution of parallel applications via a combination of robust resource allocation and dynamic loop scheduling. We will also discuss ongoing work on (1) mapping parallel applications onto highly adaptive energy-efficient computers such that the exploited parallelism is maximized and the communication cost is minimized, and (2) understanding failure occurrence in HPC systems by analysis and correlation of node outages based on system logs. We will conclude by providing insights into the future research plans of the HPC group at the Department of Mathematics and Computer Science, which include scheduling at multiple parallelism levels and modeling the resilience of HPC s.

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10. Mai 2016, Y. Willi, Departement Umweltwissenschaften, Botanik, Uni Basel

Ort: Botanisches Institut, Hörsaal, Schönbeinstrasse 6, 4051 Basel

Titel: New insights gained from population genomics

Abstract: Theory in biogeography and population genetics predicts that populations at the edges of geographic distributions may suffer from the accumulation of mutational load because they are either too small and isolated or they experienced a history of range expansion. Both demographic scenarios lead to mutation accumulation via genetic drift, along with an associated reduction in population growth rate. Under environmental change, such range edge populations may do poorly for several reasons: (1) adaptive genetic variation may limit the response to selection; (2) reduced reproductive output implies that populations may be unable to compensate for selective deaths under adaptation to a moving environmental optimum; and (3) low population size leads to reduced potential dispersal.
In my talk, I will present data on the geographic pattern and magnitude of mutation accumulation in a plant species across its entire distribution. Simulation results illustrate that genetic load quantitatively reduces population persistence under environmental change.

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Sommerpause

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03. Oktober 2016: Dr. Fabio Baruffa, Leibniz Supercomputing-Zentrum, München (D)

Zeit/Ort: 16:15 Uhr, Biozentrum der Universität Basel, Seminarraum 103, Klingelbergsrasse 70, 4056 Basel

Titel: "Towards code modernization and porting on Intel many-core architecture: the story of Gadget code"

Abstract: In the framework of the Intel Parallel Computing Centre at Leibniz Supercomputing Centre (LRZ), F. B. will present recent results on the performance optimization of Gadget-3 on multi and many-core computer architectures, including the new Intel Xeon Phi processor of second generation, codenamed Knights Landing (KNL). An overview of results for node-level scalability, vector efficiency and performance are presented here. Our work is based on an isolated, representative code kernel, where threading parallelism, data locality and vectorization efficiency was improved. The node-level parallel efficiency improved by factors ranging from 5x to 16x on Haswell and KNL nodes, respectively. Moreover, a vectorization efficiency of 80% (6.6x) on a prototypical target loop of the code is obtained without programming using intrinsics instructions.

Please note: The talk is related to the course 'HPC code-optimisation' for PhD students taught during the following three days by Dr. Baruffa at Physical Chemistry, computer room 2.11, on the ground floor.

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01. November 2016: Dr. Isabelle Marthot-Santaniello, Dept. Altertumswissenschaften, Uni Basel

Titel: "Computer Assisted Reconstruction of Ancient Aegypt Papiry"

Abstract: We are a research team in the Department of Antiquity Sciences (Ancient History) and we organize a papyrus exhibition in the UB in February 2017. Several of the pieces of a papyrus are fragments of well known literature, we thus know what text is missing. It would be great to be able to display a digital reconstruction of the item as it once was. Which CCCS member(s) would help/assist us with the digital reconstruction project?

This seminar is rather a project workshop.

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06. Dezember 2016 (Nikolaustag): Diverse Vortragende

Titel: Nikolaus von Kues - Philosoph, Jurist & mathematischer Theologe

Abstract: Kein Abstract verfügbar; Angaben finden sich unter Wikipedia.

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