From: Martin Kronbichler <kronbichler@lnm.mw.tum.de>
Date: Mon, 25 Nov 2013 09:19:25 +0000 (+0000)
Subject: Second part of r31784
X-Git-Tag: v8.1.0~178
X-Git-Url: https://gitweb.dealii.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=376155317a9eea01da3a8539978a751ec4433227;p=dealii.git

Second part of r31784

git-svn-id: https://svn.dealii.org/trunk@31790 0785d39b-7218-0410-832d-ea1e28bc413d
---

diff --git a/deal.II/include/deal.II/matrix_free/matrix_free.templates.h b/deal.II/include/deal.II/matrix_free/matrix_free.templates.h
index 0a4fa866e7..193df65ef7 100644
--- a/deal.II/include/deal.II/matrix_free/matrix_free.templates.h
+++ b/deal.II/include/deal.II/matrix_free/matrix_free.templates.h
@@ -142,7 +142,8 @@ internal_reinit(const Mapping<dim>                          &mapping,
       // initialize the basic multithreading information that needs to be
       // passed to the DoFInfo structure
 #ifdef DEAL_II_WITH_THREADS
-      if (additional_data.tasks_parallel_scheme != AdditionalData::none)
+      if (additional_data.tasks_parallel_scheme != AdditionalData::none &&
+          multithread_info.n_threads() > 1)
         {
           task_info.use_multithreading = true;
           task_info.block_size = additional_data.tasks_block_size;