From 268c0e2a04b17c868fe8e5e7a470676d76b2b649 Mon Sep 17 00:00:00 2001 From: Wolfgang Bangerth Date: Wed, 12 Jun 2013 21:58:38 +0000 Subject: [PATCH] Add a couple of sentences. git-svn-id: https://svn.dealii.org/trunk@29813 0785d39b-7218-0410-832d-ea1e28bc413d --- deal.II/doc/readme.html | 11 ++++++++--- 1 file changed, 8 insertions(+), 3 deletions(-) diff --git a/deal.II/doc/readme.html b/deal.II/doc/readme.html index 74ba479fdb..4363532c9a 100644 --- a/deal.II/doc/readme.html +++ b/deal.II/doc/readme.html @@ -418,13 +418,18 @@

  • 64bit indices: By default, deal.II use unsigned int (32bit) - indices. This limits the number of unknowns to approximately four + indices for degrees of freedom, using + the types::global_dof_index type. This limits the number of + unknowns to approximately four billions. If larger problem must be solved, pass the -DDEAL_II_WITH_64BIT_INDICES=ON argument to - cmake. To use this option with PETSc, PESTc must be compiled + cmake. You will not be able to solve problems of this size on + a single machine, but only when using clusters of computers and linear + algebra packages PETSc or Trilinos. + To use this option with PETSc, PESTc must be compiled with the option --with-64-bit-indices. To use this option with Trilinos, Trilinos 11.2 or later is needed (there is a bug in - Trilinos 11.0 that prevent the use of 64bit indices). + Trilinos 11.0 that prevents the use of 64bit indices).

    -- 2.39.5