From: Wolfgang Bangerth <bangerth@colostate.edu>
Date: Thu, 27 Sep 2018 16:05:44 +0000 (-0600)
Subject: Do some hp DoF index allocation tasks in parallel.
X-Git-Tag: v9.1.0-rc1~674^2~1
X-Git-Url: https://gitweb.dealii.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=3a96da9c3a3789da67e175ebc82ad0ab6a0aed96;p=dealii.git

Do some hp DoF index allocation tasks in parallel.
---

diff --git a/source/hp/dof_handler.cc b/source/hp/dof_handler.cc
index 582b581890..78d6cf29b2 100644
--- a/source/hp/dof_handler.cc
+++ b/source/hp/dof_handler.cc
@@ -648,8 +648,12 @@ namespace internal
 
           reserve_space_release_space(dof_handler);
 
-          reserve_space_cells(dof_handler);
-          reserve_space_vertices(dof_handler);
+          Threads::TaskGroup<> tasks;
+          tasks +=
+            Threads::new_task(&reserve_space_cells<1, spacedim>, dof_handler);
+          tasks += Threads::new_task(&reserve_space_vertices<1, spacedim>,
+                                     dof_handler);
+          tasks.join_all();
         }
 
 
@@ -666,12 +670,14 @@ namespace internal
 
           reserve_space_release_space(dof_handler);
 
-          // FIRST CELLS AND FACES
-          reserve_space_cells(dof_handler);
-          reserve_space_faces(dof_handler);
-
-          // VERTEX DOFS
-          reserve_space_vertices(dof_handler);
+          Threads::TaskGroup<> tasks;
+          tasks +=
+            Threads::new_task(&reserve_space_cells<2, spacedim>, dof_handler);
+          tasks +=
+            Threads::new_task(&reserve_space_faces<2, spacedim>, dof_handler);
+          tasks += Threads::new_task(&reserve_space_vertices<2, spacedim>,
+                                     dof_handler);
+          tasks.join_all();
         }
 
 
@@ -690,12 +696,15 @@ namespace internal
 
           reserve_space_release_space(dof_handler);
 
-          // FIRST CELLS AND FACES
-          reserve_space_cells(dof_handler);
-          reserve_space_faces(dof_handler);
-
+          Threads::TaskGroup<> tasks;
+          tasks +=
+            Threads::new_task(&reserve_space_cells<3, spacedim>, dof_handler);
+          tasks +=
+            Threads::new_task(&reserve_space_faces<3, spacedim>, dof_handler);
+          tasks += Threads::new_task(&reserve_space_vertices<3, spacedim>,
+                                     dof_handler);
 
-          // LINE DOFS
+          // While the tasks above are running, we can turn to line dofs
 
           // the situation here is pretty much like with vertices:
           // there can be an arbitrary number of finite elements
@@ -794,9 +803,8 @@ namespace internal
                   }
             }
 
-
-          // VERTEX DOFS
-          reserve_space_vertices(dof_handler);
+          // Ensure that everything is done at this point.
+          tasks.join_all();
         }