From: bangerth Date: Sat, 24 Sep 2011 03:32:13 +0000 (+0000) Subject: Add a paragraph. X-Git-Url: https://gitweb.dealii.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=3e6ff7fdb920af785724ff321b80a3435ad6254a;p=dealii-svn.git Add a paragraph. git-svn-id: https://svn.dealii.org/trunk@24402 0785d39b-7218-0410-832d-ea1e28bc413d --- diff --git a/deal.II/examples/step-31/doc/intro.dox b/deal.II/examples/step-31/doc/intro.dox index 423e6bde2b..4d87b0865c 100644 --- a/deal.II/examples/step-31/doc/intro.dox +++ b/deal.II/examples/step-31/doc/intro.dox @@ -969,6 +969,16 @@ operator part of the momentum equation. The ability to solve problems in %parallel will be explored in step-32, using the same problem as discussed here. +PETSc, which we have used in step-17 and step-18, is certainly a powerful +library, providing a large number of functions that deal with matrices, +vectors, and iterative solvers and preconditioners, along with lots of other +stuff, most of which runs quite well in %parallel. It is, however, a few years +old already than Trilinos, written in C, and generally not quite as easy to +use as some other libraries. As a consequence, deal.II has also acquired +interfaces to Trilinos, which shares a lot of the same functionality with +PETSc. It is, however, a project that is several years younger, is written in +C++ and by people who generally have put a significant emphasis on software +design.

The testcase