MIDAS'09

  MIcrowave Data Analysis for petaScale computers

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• Meetings
• 1st informal meeting: Orsay, Dec, 17, 2009;
• 2nd informal meeting: Paris, Apr, 22, 2010;
• informal hands-on mtg: Paris, May, 6, 2010;
• official kick-off mtg: Paris, May, 7, 2010;
• 3rd informal meeting: Paris, Oct, 5, 2010;
• 1st-yr review meeting: Orsay, Jun, 6, 2011;
• 4th informal meeting: Paris, Oct, 6, 2011.
• Software
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Meetings:

• 1st informal meeting, Dec., 17, 2009 (held at LRI in Orsay)

PARTICIPANTS:

Guy Atenekeng Kahou (INRIA), Jean-Marc Colley (APC), Josquin Errard (APC), Joel Falcou (Paris-Sud), Julien Grain (IAS), Laura Grigori (INRIA), Eric Hivon (IAP), Ovidiu Hupca (INRIA), Maude Le Jeune (APC), Sylvain Peyronnet (Paris-Sud), Federico Stivoli (INRIA), Radek Stompor (APC), Matt Tristram (LAL)

GOALS

This was a "physicists talk to computer scientists" meeting ("ph2cs") aiming at presenting first the overall framework of the CMB data analysis to the computer scientists, and then, in some detail, some of the existing problems in this area. We aimed at defining the first round projects, which will become the first target of the common work.

PROGRAM: (viewgraphs available via the collaborators login above)

morning session

• Opening remarks/organizational structure of ANR-MIDAS'09 (R.Stompor)
• CMB data analysis overview (M. Tristram)
• Discussion on time domain level processing (coordinated by R. Stompor)
  • - time-domain convolution;
  • - Toeplitz x vector products and banded Toeplitz x vector products;
  • - selective Fourier operations, compressed sensing, etc ...
  • - low rank noise models.

afternoon session

• Map-making algorithms (F.Stivoli):
  • - iterative solvers;
  • - projection operators;
  • - preconditioners.
• Optimizable map apodizations for B-mode analysis (J.Grain):
  • - iterative solvers;
  • - preconditioners.
• Discussion on time domain level processing cont'd (coordinated by R.Stompor):
  • - time domain gap filling - stationary noise;
  • - time domain gap filling - non-stationary contributions.

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• 2nd informal (checkpoint) meeting, Apr, 22, 2010 (held @ APC in Paris)

PARTICIPANTS:

Guy Atenekeng Kahou (INRIA), Jean-Marc Colley (APC), Josquin Errard (APC), Pierre Esterie (Paris-Sud), Joel Falcou (Paris-Sud), Yabebal Fantaye (SISSA/APC), Julien Grain (IAS), Laura Grigori (INRIA), Eric Hivon (IAP), Ovidiu Hupca (INRIA), Maude Le Jeune (APC), Amal Khabou (INRIA), Sylvain Peyronnet (Paris-Sud), Federico Stivoli (INRIA), Radek Stompor (APC), Matt Tristram (LAL)

GOALS

It was a 1st meeting of the type "computer scientists talk to physicists" ("cs2ph"). Its focus was two-fold: on numerical techniques and mathematical algorithms potentially useful for the problems discussed and defined during the 1st Orsay meeting in Dec, 2009, and on the programming approaches to new processor architectures (GPU, GPGPU, etc).

PROGRAM: (viewgraphs available via the collaborators login above)

morning session

• Opening remarks/goals of the meeting (L.Grigori);
• Preconditioning for map-making in CMB (G. Atenekeng Kahou):
  • - general-purpose preconditioners for CMB: Jacobi splitting;
  • - customized preconditiers for CMB: customized Jacobi splitting, low-rank approximations;
  • - avoiding communication in PCGs.
• Compressive sensing (S. Peyronnet):
  • - approximate quick algorithms;
  • - exact solvers;
  • - CMB context.

afternoon session

• Issues in programming for GPUs (J.Falcou);
• - current and future computer architectures;
• - openMP and programming for GPUs;
• - limitations and strength of GPU programming models.
• CMB analysis using GPUs (O. Hupca)
  • - spherical harmonic transform with CUDA.
• Discussion and plans.

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• Informal, hands-on meeting, held on May, 06, 2010 @ APC

PARTICIPANTS:

Julian Borrill (C3/LBL), Chris Cantalupo (C3/LBL), Ovidiu Hupca (INRIA), Ted Kisner (C3/LBL), Maude Le Jeune (APC), Antoine Rogier (APC), Federico Stivoli (INRIA), Radek Stompor (APC), Matt Tristram (LAL)

GOALS

The main focus of the meeting was to define the design and content of an initial version of the middle-layer CMB data analysis library. The discussed issues included:

• programming language;
• programming model;
• initial functionality;
• work organization.

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• Official "kick-off" meeting, held on May, 07, 2010 @ APC

PARTICIPANTS:

Guy Atenekeng Kahou (INRIA), Alex Borghi (LRI), Julian Borrill (C3/LBL), Chris Cantalupo (C3/LBL), Jerome Darbon (ENS-Cachan), Cyril Demange (ANR), Willie Drouhet (APC/NPAC), Josquin Errard (APC), Giulio Fabbian (APC), Yabebal Fantaye (SISSA/APC), Julien Grain (IAS), Laura Grigori (INRIA), Thomas Herault (LRI), Ovidiu Hupca (INRIA), Ted Kisner (C3/LBL), Maude Le Jeune (APC), Antoine Rogier (APC), Federico Stivoli (INRIA), Radek Stompor (APC), Matt Tristram (LAL)

GOALS

It was a 1st collaboration-wide meeting including the partners from France and the US. The goals were

• to review the work on-going in all the nodes of the project;
• to coordinate efforts undertaken in France- and the US;
• to discuss and define future common projects;
• to set up the collaboration framework.

PROGRAM: (viewgraphs available via the collaborators login above)

morning session (chair: Laura Grigori)

• Le suivi du projet ANR, C. Demange (ANR)
• Project overview/organization, R. Stompor (APC)
• Science context: cosmology, CMB, etc, J. Grain (IAS)
• CMB data analysis, M. Tristram (LAL)
• Challenges in CMB data analysis/Berkeley effort, J. Borrill (C3/LBL)
• Efficient combinatorial parallel methods for signal/image processing, J. Darbon (ENS-Cachan)
• Compressive sensing, A. Borghi (LRI)

early afternoon session (chair: Thomas Herault)

• Map-making and destriper motivated preconditioners, F. Stivoli (INRIA)
• General and custom made preconditioners, G. Atenekeng Kahou (INRIA)
• Correlated component methods, M. Le Jeune (APC)
• Efficient QR decompositions, L. Grigori (INRIA)

late afternoon session (chair: Julian Borrill)

• MADmap - massively parallel map-making code, C. Cantalupo (C3/LBL)
• Scheduling techniques, T. Herault (LRI)
• Auto-tuning and hybrid multi-/many-core architectures, T. Kisner (C3/LBL)
• GPUs and CMB data analysis: alm2map example, O. Hupca (INRIA)

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• 3rd informal meeting, Oct, 05, 2010 (held at APC in Paris)

PARTICIPANTS:

Guy Atenekeng Kahou (INRIA), Jean-Marc Colley (APC), Jerome Darbon (ENS-Cachan), Josquin Errard (APC), Pierre Esterie (Paris-Sud), Joel Falcou (Paris-Sud), Julien Grain (IAS), Laura Grigori (INRIA), Eric Hivon (IAP), Maude Le Jeune (APC), Antoine Rogier (APC), Federico Stivoli (INRIA), Radek Stompor (APC), Matt Tristram (LAL)

GOALS

This was a progress checkpoint meeting in preparations for the end of the 1st year. We reviewed the recent progress and discussed the immediate and long-term goals.

PROGRAM: (viewgraphs available via the collaborators login above)

morning session

• Opening remarks (R.Stompor)
• CMB DA library - an overview (R.Stompor)
• CMB DA library - Toeplitz algebra module (A.Rogier/M.Le Jeune)

afternoon session

• Preconditioner techniques for map-making (G. Atenekeng Kahou/F.Stivoli)
• Spherical harmonic transform with GPU and CUDA (J.Falcou)
• Spherical harmonic tranform for many-cores (P.Esterie)
• CMB time domain data processing techniques (J.Darbon)

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• 1st-year review meeting, Jun, 06, 2011 (held at LRI in Orsay)

PARTICIPANTS:

Marc Baboulin (Paris-Sud), Josquin Errard (APC), Pierre Esterie (Paris-Sud), Giulio Fabbian (APC), Mathias Gaunard (Paris-Sud), Julien Grain (IAS), Laura Grigori (INRIA), Maude Le Jeune (APC), Antoine Rogier (APC), Radek Stompor (APC), Mikolaj Szydlarski (INRIA), Matt Tristram (LAL)

GOALS

This was a 1st-year review meeting summarizing the work done in the 1st year of the project and defining the major goals for the 2nd year. Specific emphasis was on the CMB DA library design and implementation.

PROGRAM: (viewgraphs available via the collaborators login above)

morning session

• Opening remarks (R.Stompor);
• CMB DA library - Toeplitz algebra module (A.Rogier);
• Spherical harmonic transforms on GPGPU platforms (M.Szydlarski);
• Embedded Domain Specific Language (EDSL) for the MIDAS libary (P.Esterie).

afternoon session

• Discussion on the library design, functionality, and implementation;
• Discussion on the implementation of the ANR mid-term review recommendations.

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• 4th informal meeting, Oct, 06, 2011 (held at APC in Paris)

PARTICIPANTS:

Pierre Cargemel (APC), Giulio Fabbian (APC), Laura Grigori (INRIA), Sophie Moufawad (INRIA), Maude Le Jeune (APC), Meisam Sharify (INRIA), Radek Stompor (APC), Mikolaj Szydlarski (INRIA)

GOALS

This was a first post-vacation meeting to jump start the work in the new academic year. We have briefly recapped the work done earlier and discussed at some length the plans for the coming year. We took the opportunity to welcome our three new collaborators Meisam Sharify, Sophie Moufawad, and Pierre Cargemel.

PROGRAM: (viewgraphs available via the collaborators login above)

morning session

• Opening remarks (R.Stompor);
• CMB data analysis for 'uninvolved' (G. Fabbian)
• Toeplitz algebra module as of the fall 2011 and after the departure of A.Rogier (M. Le Jeune);
• Spherical harmonic multi-coe and GPGPU transforms package (M.Szydlarski);
• Communication avoiding GMRES (S.Moufawad)

afternoon session

• CMB DA MIDAS library - what next ?! (R.Stompor);
• Discussion of the iterative solvers and communication bottlenecks.
• Planning for the future.

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