Costas Bekas  Costas Bekas photo       

contact information

Distinguished Research Staff Member, Mgr. Foundations of Cognitive Computing
IBM Research - Zurich, Switzerland
  +41dash44dash724dash89dash69

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Professional Associations

Professional Associations:  ACM  |  Society for Industrial and Applied Mathematics


2016

Stochastic matrix-function estimators: Scalable Big-Data kernels with high performance
Staar, Peter WJ and Barkoutsos, Panagiotis Kl and Istrate, Roxana and Malossi, A Cristiano I and Tavernelli, Ivano and Moll, Nikolaj and Giefers, Heiner and Hagleitner, Christoph and Bekas, Costas and Curioni, Alessandro
Parallel and Distributed Processing Symposium, 2016 IEEE International, pp. 812--821
Abstract


2015

An extreme-scale implicit solver for complex pdes: Highly heterogeneous flow in earth's mantle
Rudi, Johann and Malossi, A Cristiano I and Isaac, Tobin and Stadler, Georg and Gurnis, Michael and Staar, Peter WJ and Ineichen, Yves and Bekas, Costas and Curioni, Alessandro and Ghattas, Omar
Proceedings of the international conference for high performance computing, networking, storage and analysis, pp. 5, 2015
Abstract


2014

NanoStreams: Advancing the hardware and software stack for real-time analytics on fast data streams
Gillan, Charles J and Nikolopoulos, Dimitrios S and Bilas, Angelos and Bekas, Costas
eChallenges e-2014, 2014 Conference, pp. 1--8
Abstract

LibSkylark: Sketching-Based Matrix Computations for Machine Learning. IBM Research, in collaboration with Bloomberg Labs, NCSU
Avron, Haim and Bekas, Costas and Boutsidis, Christos and Clarkson, Kenneth and Kambadur, Prabhanjan and Kollias, Giorgos and Mahoney, Michael and Ipsen, Ilse and Ineichen, Yves and Sindhwani, Vikas and others
2014 - … , and Yahoo Labs. Available at http:// …, Stanford, UC Berkeley, and Yahoo Labs. Available at http://xdataskylark. github. io/libskylark

Shedding Light on Lithium/Air Batteries Using Millions of Threads on the BG/Q Supercomputer
Valéry Weber, Costas Bekas, Teodoro Laino, Alessandro Curioni, Adam Bertsch, Scott Futral
28th IEEE International Symposium on Parallel and Distributed Processing, pp. 735-744, 2014

Changing computing paradigms towards power efficiency
P. Klavik, A. Cristiano, I. Malossi, C. Bekas, A. Curioni
Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 372(2018), 20130278, The Royal Society, 2014


2013

Accelerating data uncertainty quantification by solving linear systems with multiple right-hand sides
V. Kalantzis, C. Bekas, A. Curioni, E. Gallopoulos
Numerical Algorithms 62(4), 637-653 , Springer, 2013


11 PFLOP/s simulations of cloud cavitation collapse
D. Rossinelli, B. Hejazialhosseini, P. Hadjidoukas, C. Bekas, A. Curioni, A. Bertsch, S. Futral, S.J. Schmidt, N.A. Adams and P. Koumoutsakos
SC '13 Proceedings of International Conference for High Performance Computing, Networking, Storage and Analysis, pp. 3, 2013

Early experiences with scientific applications on the IBM Blue Gene/Q supercomputer
S. Alam, C. Bekas, H. Boettiger, A. Curioni, G. Fourestey, W. Homberg, M. Knobloch, T. Laino, T. Maurer, B. Mohr, D. Pleiter, A. Schiller, T. Schulthess, V. Weber
IBM Journal of Research and Development 57(1/2), 1-9, 2013


2012

A MASSIVELY PARALLEL GENERAL PURPOSE MULTI-OBJECTIVE OPTIMIZATION FRAMEWORK, APPLIED TO BEAM DYNAMIC STUDIES
Y Ineichen, A Adelmann, C Bekas, A Curioni, P Arbenz
2012 - accelconf.web.cern.ch

Massively Parallel Graph Partitioning: A Case in Human Bone Simulations
C. Bekas, A. Curioni, P. Arbenz, C. Flaig, GH van Lenthe, R. Müller, AJ Wirth
Combinatorial Scientific Computing12, 407, Chapman & Hall, 2012

Algorithmic Rethinking and Code Reengineering for Truly Massively Parallel ab initio Molecular Dynamics Simulations
C. Bekas, A. Curioni
Hierarchical Methods for Dynamics in Complex Molecular Systems, 235, Forschungszentrum Jülich, 2012

A fast and scalable low dimensional solver for charged particle dynamics in large particle accelerators
Yves Ineichen, Andreas Adelmann, Costas Bekas, Alessandro Curioni, Peter Arbenz
Computer Science-Research and Development, 1-8, Springer, 2012


2011

Low-cost data uncertainty quantification
C. Bekas, A. Curioni, I. Fedulova
Concurrency and Computation: Practice and Experience 24(8), 908-920, Wiley Online Library, 2011

Toward architecture aware graph partitioning
A. Stathopoulos, C. Bekas, A. Curioni
5th SIAM Workshop on Combinatorial Scientific Computing, Darmstadt, Germany, pp. 34, 2011


2010

Special issue on parallel matrix algorithms and applications
Bekas, Costas and D’Ambra, Pasqua and Grama, Ananth and Saad, Yousef and Yanev, Petko
Parallel Computing 36(5), 213--214, North-Holland, 2010

Special issue on parallel matrix algorithms and applications
Costas Bekas, Pasqua D’Ambra, Ananth Grama, Yousef Saad, Petko Yanev
Parallel Computing 36(5), 213--214, North-Holland, 2010


A new energy aware performance metric
C Bekas, A Curioni
Computer Science-Research and Development 25(3), 1-9, Springer, 2010

Extreme scalability challenges in micro-finite element simulations of human bone
C. Bekas, A. Curioni, P. Arbenz, C. Flaig, G.H. Van Lenthe, R. Müller, AJ Wirth
Proc, pp. 2282-2296, Wiley Online Library, 2010


2009

Low cost high performance uncertainty quantification
C. Bekas, A. Curioni, I. Fedulova
Proceedings of the 2nd Workshop on High Performance Computational Finance, pp. 8, ACM, 2009


2008

Extreme scalability challenges in analyses of human bone structures
P. Arbenz, G.H. van Lenthe, R. Müller, AJ Wirth, C. Bekas, A. Curioni
Joint Meeting of the 8th World Congress on Computational Mechanics (WCCM8) and 5th European Congress on Computational Methods in Applied Sciences and Engineering (ECCOMAS 2008), Venice, Italy

Computation of large invariant subspaces using polynomial filtered Lanczos iterations with applications in density functional theory
C Bekas, E Kokiopoulou, Y Saad
SIAM Journal on Matrix Analysis and Applications 30(1), 397--418, Society for Industrial and Applied Mathematics, 2008



2007


An estimator for the diagonal of a matrix
C Bekas, E Kokiopoulou, Y Saad
Applied numerical mathematics 57(11-12), 1214--1229, Elsevier, 2007

New scalability frontiers in ab initio electronic structure calculations using the BG/L supercomputer
C. Bekas, A. Curioni, W. Andreoni
Proceedings of the 8th international conference on Applied parallel computing: state of the art in scientific computing, pp. 1026--1035, Springer, 2007


2006


Diagonalization methods in PARSEC
Y Saad, Y Zhou, C Bekas, M L Tiago, J Chelikowsky
physica status solidi (b) 243(9), 2188--2197, Wiley Online Library, 2006


2005

Polynomial filtered Lanczos iterations with applications in Density Functional Theory
C Bekas, E Kokiopoulou, Y Saad
SIAM J. Matrix Anal. Appl 30(1), 397--418, Citeseer, 2005

The design of a distributed MATLAB-based environment for computing pseudospectra
C Bekas, E Kokiopoulou, E Gallopoulos
Future Generation Computer Systems 21(6), 930--941, Elsevier, 2005

Computation of smallest eigenvalues using spectral Schur complements
C Bekas, Y Saad
SIAM Journal on Scientific Computing 27(2), 458, Society for Industrial and Applied Mathematics, 2005

Computing charge densities with partially reorthogonalized Lanczos
C Bekas, Y Saad, M L Tiago, J R Chelikowsky
Computer physics communications 171(3), 175--186, Elsevier, 2005


2004

Amls, spectral schur complements and iterative computation of eigenvalues
C Bekas, Y Saad
PMAA 04, Marseilles, France, 2004

Pseudospectra computation of large matrices
CN Bekas, E Gallopoulos, V Simoncini
Preprint, University of Minnesota, Citeseer, 2004

Computing smallest singular triplets with implicitly restarted Lanczos bidiagonalization
E Kokiopoulou, C Bekas, E Gallopoulos
Applied numerical mathematics 49(1), 39--61, Elsevier, 2004


2003

Transfer functions and path following for computing pseudospectra
C Bekas, E Gallopoulos, V Simoncini
Proceedings of the SIAM Conference in Applied Linear Algebra, Extended Abstract, Williamsburg, VA, 2003


2002

Parallel computation of pseudospectra using transfer functions on a MATLAB-MPI cluster platform
C Bekas, E Kokiopoulou, E Gallopoulos, V Simoncini
Recent Advances in Parallel Virtual Machine and Message Passing Interface, 199--207, Springer, 2002

Parallel computation of pseudospectra by fast descent
C Bekas, E Gallopoulos
Parallel Computing 28(2), 223--242, Citeseer, 2002


2001

Towards the effective parallel computation of matrix pseudospectra
C Bekas, E Kokiopoulou, I Koutis, E Gallopoulos
Proceedings of the 15th international conference on Supercomputing, pp. 260--269, 2001

Cobra: Parallel path following for computing the matrix pseudospectrum
C Bekas, E Gallopoulos
Parallel Computing 27(14), 1879--1896, Citeseer, 2001


2000

On the computational effectiveness of transfer function approximations to the matrix pseudospectrum
C Bekas, E Gallopoulos, V Simoncini
Proc, pp. 204--206, 2000


1998

Parallel algorithms for the computation of pseudospectra
C Bekas, I Koutis
Master's Thesis, Computer Engineering and Informatics Department, University of Patras, 1998


Year Unknown

Machine Learning Algorithms for the performance and energy-aware characterization of linear algebra Kernels on multithreaded architectures
Malossi, A Cristiano I and Ineichen, Yves and Bekas, Costas and Curioni, Alessandro and Quintana-Ort{\'\i}, Enrique S
Energy1, 1--5, 0
Abstract