価値創造研究センター外国人客員教員Osni Marques先生（片桐研究室受け入れ）によるオンライン講演会が行われます
 
日時：2021年12月23日（木）10:00-11:00
 
場所： ZOOM開催です。参加希望者は片桐教授(katagiri@cc.nagoya-u.ac.jp)までメールにてご連絡ください。
 
題目： An Overview of the IDEAS-ECP Project and Minimization Strategies for Solving Eigenvalue Problem
 
講演者：Dr. Osni Marques　
 
概要：This presentation will consist of two parts. In the first part, I will give an overview of IDEAS-ECP, a project funded by the US Department of Energy Exascale Project (ECP) that seeks to promote software quality as essential for quality science. IDEAS-ECP evaluates and disseminates best practices and methodologies to improve developer productivity, software sustainability, and scientific reproducibility. I will summarize the activities carried by IDEAS-ECP, which range from collaborations with individual ECP teams to help in the understand productivity bottlenecks and improve software development practices, to interactions with ECP software developers to help identify training and support needs, and the organization of a variety of events that foster the discussion of software development experiences. In the second part, I will discuss ongoing work on unconstrained minimization schemes for dealing with eigenvalue problems. These schemes employ a preconditioned conjugate gradient approach that avoids an explicit reorthogonalization of the trial eigenvectors, in contrast to typical iterative eigenvalue solvers, therefore reducing communications and becoming a potential alternative for the solution of large problems on massively parallel computers. Our current focus is on problems related to electronic structure calculations.
Preliminary results show that the unconstrained formulation, together with an appropriate preconditioner, offers good convergence properties and scales well on a large number of cores.