From: David Wells Date: Thu, 14 Jul 2016 21:16:44 +0000 (-0400) Subject: Add a warning against using --download-mpich. X-Git-Tag: v8.5.0-rc1~866^2 X-Git-Url: https://gitweb.dealii.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=886e2fe51c358a8d21fb331370071bbca259021b;p=dealii.git Add a warning against using --download-mpich. This is a PETSc option that usually causes trouble, especially when a user already has MPI installed on their machine. --- diff --git a/doc/external-libs/petsc.html b/doc/external-libs/petsc.html index 10a92ab7b7..78b75b2762 100644 --- a/doc/external-libs/petsc.html +++ b/doc/external-libs/petsc.html @@ -113,7 +113,12 @@

This automatically builds PETSc with both MPI and the algebraic - multigrid preconditioner package Hypre (which we use in step-40). + multigrid preconditioner package Hypre (which we use in step-40). If you + would like to use PETSc with MPI then we recommend that you install MPI + through your package manager instead of letting PETSc install it: put + another way, installing PETSc with the flag --download-mpich + often causes problems (such as linking errors or poor performance) + that may be avoided by using whatever your system provides instead.
Now let PETSc check his own sanity: