From: Bruno Turcksin <bruno.turcksin@gmail.com>
Date: Wed, 12 Jun 2013 19:58:45 +0000 (+0000)
Subject: Add documentation about 64bit indices.
X-Git-Tag: v8.0.0~295
X-Git-Url: https://gitweb.dealii.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=15ec4cbec249a0d34b97b6d85eace196df8fcfc0;p=dealii.git

Add documentation about 64bit indices.

git-svn-id: https://svn.dealii.org/trunk@29812 0785d39b-7218-0410-832d-ea1e28bc413d
---

diff --git a/deal.II/doc/readme.html b/deal.II/doc/readme.html
index e80ebdac83..74ba479fdb 100644
--- a/deal.II/doc/readme.html
+++ b/deal.II/doc/readme.html
@@ -414,6 +414,19 @@
           <code>-DDEAL_II_COMPONENT_PARAMETER_GUI=ON</code>. Beware of the
           fact that <code>parameter_gui</code> needs development packages for Qt.
 	</p>
+
+      <li>
+  <p>
+    <i>64bit indices</i>: By default, deal.II use unsigned int (32bit)
+    indices. This limits the number of unknowns to approximately four
+    billions. If larger problem must be solved, pass the
+    <code>-DDEAL_II_WITH_64BIT_INDICES=ON</code> argument to
+    <code>cmake</code>. To use this option with PETSc, PESTc must be compiled
+    with the option <code>--with-64-bit-indices</code>. 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).
+  </p>
+
     </ul>