Osni Marques is a Staff Scientist in the Applied Mathematics and Computational Research Division of Lawrence Berkeley National Laboratory. He has worked on various aspects of high-end scientific computing, including eigenvalue solvers for applications in engineering, biochemistry, earth sciences and electronic structure calculations; and algorithms for dense linear algebra calculations (eigenvalue problems and SVD) in the LAPACK and ScaLAPACK libraries. Currently, he has been working on improving the performance of specific components of an algebraic multigrid solver (in collaboration with LLNL), and the Alquimia biogeochemistry software (developed at LBNL). He has served on the programming committees of a number of scientific conferences, provided referee services to various DOE and NSF programs, and provided (as an IPA and detailee) expertise for DOE's Advanced Scientific Computing Research (ASCR) Program. Osni earned his Ph.D. in structural engineering at the Federal University of Rio de Janeiro, Brazil.

## Journal Articles

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J. González-Domínguez, O. Marques, M. J. Martín and J. Touriño,
"A 2D Algorithm with Asymmetric Workload for the UPC Conjugate Gradient Method",
The Journal of Supercomputing,
2014,
70:816-829,

###
A. Fujii, O. Marques,
"Axis Communication Method for Algebraic Multigrid Solver",
IEICE Transactions on Information and Systems,
2014,
E97-D:2955-2958,

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O. Marques, J. Demmel, C. Voemel, B. Parlett,
"A Testing Infrastructure for Symmetric Tridiagonal Eigensolvers",
ACM TOMS,
2008,
35,

###
J. Demmel, O. Marques, C. Voemel, B. Parlett,
"Performance and Accuracy of LAPACK's Symmetric Tridiagonal Eigensolvers",
SIAM Journal on Scientific Computing,
2008,
30:1508–1526,

###
A. Canning, O. Marques, C. Voemel, L.-W. Wang, J. Dongarra, J. Langou, S. Tomov,
"New eigensolvers for large-scale nanoscience simulations",
Journal of Physics: Conference Series,
2008,
125,
doi: 10.1088/1742-6596/125/1/012074

###
O. Marques, B. Parlett, C. Voemel,
"Computations of Eigenpair Subsets with the MRRR Algorithm",
Numer. Linear Algebra Appl.,
2006,
13:643–653,

###
O. Marques, C. Voemel, J. Riedy,
"Benefits of IEEE-754 Features in Modern Symmetric Tridiagonal Eigensolvers",
SIAM J. Sci. Comput.,
2006,
28:1613-1633,

###
D. Vasco, L. Johnson, O. Marques,
"Resolution, Uncertainty and Whole Earth Tomography",
Journal of Geophysical Research, Solid Earth,
2003,
108,

###
B. Parlett, O. Marques,
"An Implementation of the dqds Algorithm (positive case)",
Linear Algebra and its Applications,
2000,
309:217-259,

## Conference Papers

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Naoya Nomura, Akihiro Fujii, Teruo Tanaka, Kengo Nakajima, Osni Marques,
"Performance Analysis of SA-AMG Method by Setting Extracted Near-kernel Vectors",
VECPAR 2016,
Porto, Portugal,
Springer,
June 2016,

###
Osni Marques, Paulo B. Vasconcelos,
"Computing the Bidiagonal SVD through an Associated Tridiagonal Eigenproblem",
VECPAR 2016,
Porto, Portugal,
Springer,
June 2016,

###
Osni Marques, Alex Druinsky, Xiaoye S. Li, Andrew T. Barker, Panayot Vassilevski, Delyan Kalchev,
"Tuning the Coarse Space Construction in a Spectral AMG Solver",
ICCS 2016 (The International Conference on Computational Science),
San Diego, CA,
Elsevier,
June 2016,

###
Alex Druinsky, Pieter Ghysels, Xiaoye S. Li, Osni Marques, Samuel Williams, Andrew Barker, Delyan Kalchev, Panayot Vassilevski,
"Comparative Performance Analysis of Coarse Solvers for Algebraic Multigrid on Multicore and Manycore Architectures",
International Conference on Parallel Processing and Applied Mathematics (PPAM),
September 6, 2015,
doi: 10.1007/978-3-319-32149-3_12

###
J. Gonzalez-Domınguez, O. Marques, M. Martın, G. Taboada, J. Tourino,
"Design and Performance Issues of Cholesky and LU Solvers using UPCBLAS",
10th IEEE International Symposium on Parallel and Distributed Processing with Applications,
Madrid,
2012,

###
M. Kawai, T. Iwashita, H. Nakashima and O. Marques,
"Parallel Smoother Based on Block Red-Black Ordering for Multigrid Poisson Solver",
LNCS, Proc. VECPAR 2012, Kobe, Japan,
Springer,
2012,
7851:292-299,

###
J. Demmel, J. Dongarra, B. Parlett, W. Kahan, M. Gu, D. Bindel, Y. Hida, X. Li, O. Marques, J. Riedy, C. Vömel, J. Langou, P. Luszczek, J. Kurzak, A. Buttari, J. Langou, S. Tomov,
"Prospectus for the next LAPACK and ScaLAPACK Libraries",
PARA 2006,
Umeå, Sweden,
2006,

## Reports

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W. Kramer, J. Carter, D. Skinner, L. Oliker, P. Husbands, P. Hargrove, J. Shalf, O. Marques, E. Ng, A. Drummond, K. Yelick,
"Software Roadmap to Plug and Play Petaflop/s",
2006,

## Posters

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Alex Druinsky, Brian Austin, Sherry Li, Osni Marques, Eric Roman, Samuel Williams,
"A Roofline Performance Analysis of an Algebraic Multigrid Solver",
Supercomputing (SC),
November 2014,