break if Umfpack does not reach tolerance

AMDiS/src/UmfPackSolver.h

@@ -60,8 +60,9 @@ namespace AMDiS {
     template< typename Vector> 
     int solve(const Matrix& A, Vector& x, Vector& b) 
     { 
-      if (!solver) {
-	if (!symmetric_strategy)
+     FUNCNAME("(UmfPackSolver.h)::solve()");
+     if (!solver) {
+        if (!symmetric_strategy)
 	  solver = new mtl::matrix::umfpack::solver<matrix_type>(A);
 	else
 	  solver = new mtl::matrix::umfpack::solver<matrix_type>(A, UMFPACK_STRATEGY_SYMMETRIC);
@@ -84,7 +85,7 @@ namespace AMDiS {
         oem.setErrorCode(code);
         std::cout << "UmfPackSolver: ||b-Ax|| = " << residual << "\n";
 	if (residual > oem.getTolerance()) {
-          WARNING("Tolerance tol=%e could not be reached!\n", oem.getTolerance());
+	    ERROR_EXIT("Tolerance tol=%e could not be reached!\n Set tolerance by '->solver->tolerance:' \n", oem.getTolerance());	  
 	}
       }
       return code;