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Ph.D de

Ph.D
Group : Parallelism

Programming hierarchical and heterogenous architectures

Starts on 01/09/2008
Advisor : ETIEMBLE, Daniel

Funding : AM
Affiliation : Université Paris-Sud
Laboratory : LRI

Defended on 10/11/2011, committee :
Rapporteurs :
— M. Philippe Clauss, Professeur à l'Université de Strasbourg
— M. Frédéric Loulergue, Professeur à l'Université d'Orléans

Examinateurs :
__ M. Gaétan Hains , Professeur à l'Université Paris-Est Créteil (UPEC) , Président de jury
— M. Alain Mérigot, Professeur à l'Université Paris-Sud 11 - IEF

Directeur de thèse :
— M. Daniel Etiemble, Professeur à l'Université Paris-Sud 11 -LRI
— M. Joel Falcou, Maître de conférence à l'Université Paris-Sud 11 -LRI

Research activities :

Abstract :
Applications based on streams, ordered sequences of data values, are important
targets of program optimization because of their high computational requirements
and the diversity of their application domains: communication, embedded systems,
multimedia, etc. One of the most important and difficult problems in special purpose
stream language design and implementation is how to schedule these applications
in a fine-grain way to exploit available machine resources.
In this thesis we propose a framework for fine-grain scheduling of streaming ap-
plications and nested loops in general. First, we try to pipeline steady state phases
(inner loops), by finding the repeated kernel pattern, and executing actor occur-
rences in parallel as much as possible. Then we merge the kernel prolog and epilog
of pipelined phases to move them out of the outer loop. Merging the kernel prolog
and epilog means that we shift actor occurrences, or instructions, from one phase it-
eration to another and from one outer loop iteration to another, a multidimensional
shifting.
Experimental shows that our framework can improve performance, parallelism
extraction without increasing the code size, in streaming applications and nested
loops in general.

Ph.D. dissertations & Faculty habilitations
APPRENTISSAGE ET OPTIMISATION SUR LES GRAPHES


ANALYSE DE DONNéES MULTI-MODALES POUR LES PATHOLOGIES COMPLEXES PAR LA CONCEPTION ET L’IMPLéMENTATION DE PROTOCOLES REPRODUCTIBLES ET RéUTILISABLES


DESIGNING INTERACTIVE TOOLS FOR CREATORS AND CREATIVE WORK
Creative work has been at the core of research in Human-Computer Interaction (HCI). I describe the results of a series of studies that look at how creators work, where creators include artists with years of professional practice, as well as learners, or novices and casual makers. My research focuses on three creation activities: drawing, physical modeling, and music composition. For these activities, I examine how artists switch between representations and how these representations evolve throughout their creative process, from early sketches to fine-grained forms or structured vocabularies. I present interactive systems that enrich their workflow (i) by extending their computer tools with physical user interfaces, or (ii) by making physical materials interactive. I also argue that sketch-based representations can allow for user interfaces that are more personal and less rigid. My presentation will reflect on lessons and limitations of this work and discuss challenges for future design-support tools.