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The Highly Scalable Iterative Solver Library PHIST

Basermann, Achim and Röhrig-Zöllner, Melven and Thies, Jonas (2015) The Highly Scalable Iterative Solver Library PHIST. 21th Advanced Supercomputing Environment (ASE) Seminar of the University of Tokyo, 2. Dez. 2015, Tokio, Japan.

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As modern supercomputers approach the Exascale, many numerical libraries face scalability issues due to the massive increase in CPU cores compared to memory bandwidth. Sparse matrix algorithms, e.g. iterative linear and eigenvalue solvers, are particularly affected by the relatively slow memory subsystem. In the German Research Foundation (DFG) project ESSEX (Equipping Sparse Solvers for Exascale), we developed the flexible software framework PHIST for implementing iterative methods on HPC systems. PHIST (Pipelined Hybrid Iterative Solver Toolkit) has been developed containing an interface to the existing numerical software framework Trilinos originally. PHIST also includes adapters to basic building block libraries so that high-level algorithm developments can benefit from high-performance kernel implementations, e.g. sparse matrix-vector multiplication kernels. Moreover, PHIST provides systematic and continuous testing of all software components and allows us to develop stable implementations of innovative iterative methods in an evolving hard- and software environment. Using the PHIST framework, we present recent work on sparse eigenvalue solvers, from scalable basic operations to complete algorithms, with a focus on the difficult problem of finding interior eigenvalues. In this context, we also discuss the application of the CARP-CG method as a preconditioner for applications such as Graphene simulation.

Item URL in elib:https://elib.dlr.de/100610/
Document Type:Conference or Workshop Item (Speech)
Additional Information:Funded through DFG Priority Programme 1648 “Software for Exascale Computing”, Project ESSEX
Title:The Highly Scalable Iterative Solver Library PHIST
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Date:2 December 2015
Refereed publication:No
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:No
Keywords:Scalable library; iterative solvers; sparse eigenproblems; optimized kernels; hybrid parallelization; fault tolerance; test framework
Event Title:21th Advanced Supercomputing Environment (ASE) Seminar of the University of Tokyo
Event Location:Tokio, Japan
Event Type:Workshop
Event Dates:2. Dez. 2015
Organizer:Universität Tokio
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space System Technology
DLR - Research area:Raumfahrt
DLR - Program:R SY - Space System Technology
DLR - Research theme (Project):R - Vorhaben SISTEC (old)
Location: Köln-Porz
Institutes and Institutions:Institut of Simulation and Software Technology > Distributed Systems and Component Software
Deposited By: Basermann, Dr.-Ing. Achim
Deposited On:09 Dec 2015 16:20
Last Modified:31 Jul 2019 19:57

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