From 58a7589d7de8b9e673479213a3d5d2417516f88d Mon Sep 17 00:00:00 2001
From: Markus Blatt <markus@dr-blatt.de>
Date: Thu, 27 Mar 2014 11:49:41 +0100
Subject: [PATCH] Throw an error when using a sequential solver in parallel

---
 opm/core/linalg/LinearSolverIstl.cpp | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/opm/core/linalg/LinearSolverIstl.cpp b/opm/core/linalg/LinearSolverIstl.cpp
index 5355d05b..fdb6c58a 100644
--- a/opm/core/linalg/LinearSolverIstl.cpp
+++ b/opm/core/linalg/LinearSolverIstl.cpp
@@ -24,6 +24,7 @@
 
 #include <opm/core/linalg/LinearSolverIstl.hpp>
 #include <opm/core/linalg/ParallelIstlInformation.hpp>
+#include <opm/core/utility/ErrorMacros.hpp>
 
 // Silence compatibility warning from DUNE headers since we don't use
 // the deprecated member anyway (in this compilation unit)
@@ -50,7 +51,7 @@
 
 #include <stdexcept>
 #include <iostream>
-
+#include <type_traits>
 
 namespace Opm
 {
@@ -224,6 +225,10 @@ namespace Opm
             break;
         case FastAMG:
 #if defined(HAS_DUNE_FAST_AMG) || DUNE_VERSION_NEWER(DUNE_ISTL, 2, 3)
+            if(std::is_same<C,Dune::OwnerOverlapCopyCommunication<int,int> >::value)
+            {
+                OPM_THROW(std::runtime_error, "Trying to use sequential FastAMG solver for a parallel problem!");
+            }
             res = solveFastAMG(opA, x, b, sp, comm, linsolver_residual_tolerance_, maxit, linsolver_verbosity_,
                                linsolver_prolongate_factor_);
 #else