Introduction

Hypre is a library for solving large, sparse linear systems of equations on massively parallel computers. The main features of this library are:

• Scalable preconditioners. Hypre contains several families of preconditioned algorithms focused on the scalable solution of very large sparse linear systems. These algorithms include structured multigrid and element-based algebraic multigrid
  
• Implementation of a suit of common iterative methods. Hypre provides commonly used Krylov-based iterative methods to be used with its scalable preconditioners. These include Conjugate Gradient and GMRES for symmetric and unsymmetric matrices, respectively.
  
• Intuitive grid-centric interfaces. Hypre provides data structures to represent and manipulate sparse matrices through interfaces. Each interface provides access to several solvers without the need to write new interface codes. These interfaces include stencil-based structured/semi-structured interfaces, finite-element based unstructured interface, and a linear algebra based interface.
  
• Configuration Options. Hypre can be installed in several computer platforms by simply setting a set of installation parameters. These parameters or options include compilers, optimization modes, and versions of MPI and BLAS routines particular to the users' computational environment. In most cases, users only need to type a configure command followed by a make command.
  
• Dynamic configuration of parameters. Hypre works for users with different levels of expertise. More experience users can take further control of the solution process through various tunning parameters.
  
• User defined interfaces for multiple languages. Hypre currently supports Fortran and C languages.

Users

The problems of interest arise in the simulation codes being developed at the United States Department of Energy's Lawrence Livermore National Laboratory (LLNL), and also elsewhere, to study physical phenomena in the defense, environmental, energy, and biological sciences.

Hypre supports four conceptual interfaces. The first one is a structured grid interface called struct and it aims applications with logically rectangular grids. The second kind is a semi-structured grid interface named sstruct that targets applications with grids that are mostly structured, but with some unstructured features (e.g., AMR, block-structured, overset). The third kind is a unstructured grid interface designed for Finite Element applications called FEI. The last type is a Linear-Algebraic Interface for applications with sparse linear systems of equations IJ.

The images in the left panel come from applications that use Hypre (click on the icon to display the full image in a new window).

Documentation

• Hypre Reference Manual
• Hypre Users Manual

• Related Tools:

• LOPBCG-Hypre Eigensolver

Developers