From 864febf9f946e961e6349baac243aa3617086e61 Mon Sep 17 00:00:00 2001 From: bangerth Date: Tue, 11 Mar 2008 19:09:35 +0000 Subject: [PATCH] Shorten the PETSc entry, add an entry on Trilinos. git-svn-id: https://svn.dealii.org/trunk@15886 0785d39b-7218-0410-832d-ea1e28bc413d --- deal.II/doc/readme.html | 55 +++++++++++++++++++++++++++++------------ 1 file changed, 39 insertions(+), 16 deletions(-) diff --git a/deal.II/doc/readme.html b/deal.II/doc/readme.html index 487a733be8..a27641d78e 100644 --- a/deal.II/doc/readme.html +++ b/deal.II/doc/readme.html @@ -5,7 +5,7 @@ The deal.II Readme - + @@ -552,22 +552,17 @@
deal.II can interface to the PETSc - library. PETSc's main strength is to provide lots of functions for - linear algebra, among several other things. It comes with + library. PETSc's provides lots of functions for + linear algebra, among other things, for example implementations of a variety of linear solvers, as well as various - different sparse and dense matrix and vector formats, for which + different sparse and dense matrix and vector formats. deal.II has wrapper classes that provide almost the same interfaces as the built-in deal.II linear algebra classes. The main advantage of PETSc is the variety of its algorithms, and that all of them can work in a parallel setting, i.e. matrices and vectors can be distributed across a cluster of - computers that communicate via MPI. This makes PETSc the choice of - linear algrebra implementations for very large problems that do not fit - into a single computer's memory or have run-times that are too long for - a single computer. At present, our interfaces are only wrappers for - vector and matrix formats, as well as to their solver and preconditioner - classes. However, we plan to extend this to a tighter coupling in the - future. + computers that communicate via MPI, providing deal.II + with parallel computing capabilities.

@@ -581,11 +576,12 @@ compiled. If these environment variables are set, then deal.II will pick them up during configuration, and store them. It will then also recognize that PETSc shall be used, and - enable the wrapper classes (they are disabled by default, if PETSc is - unavailable). However, you can override the values of these environment - variablaes by using the --with-petsc=DIR and - --with-mpi-arch=ARCH switches to - ./configure. If you do have a PETSc installation + enable the wrapper classes. The + --with-petsc=DIR and + --with-petsc-arch=ARCH switches to + ./configure can be used to override the values + of PETSC_DIR and PETSC_ARCH or if these + environment variables are not set at all. If you do have a PETSc installation and have set the PETSC_DIR and PETSC_ARCH environment variables but do not wish deal.II to be configured for PETSc use, you @@ -612,6 +608,33 @@

+ + +
Trilinos
+
+

+ deal.II can also interface to the Trilinos software + library. Trilinos, like PETSc, provides a large number of linear algebra + and other classes that can be used on sequential or parallel + computers. It is written in C++ and considered more modern than PETSc. +

+ +

+ As with our PETSc support, deal.II + has wrappers that allow Trilinos linear algebra classes to be used with + the same interface as deal.II classes. These + interfaces can be enabled by setting the TRILINOS_DIR + environment variable to the path to an existing Trilinos installation, + or using the --enable-trilinos=/path/to/trilinos switch of + the ./configure script. The Trilinos installation needs to + provide the same kind of libraries that deal.II is + configured for, i.e. if you want deal.II to use shared libraries, then + Trilinos needs to use shared libraries as well. +

+
+ +
Metis
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