From: Rene Gassmoeller <rene.gassmoeller@mailbox.org>
Date: Wed, 2 Aug 2023 20:43:36 +0000 (-0400)
Subject: Avoid memory allocations in step 68
X-Git-Tag: relicensing~623^2
X-Git-Url: https://gitweb.dealii.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=refs%2Fpull%2F15832%2Fhead;p=dealii.git

Avoid memory allocations in step 68
---

diff --git a/examples/step-68/step-68.cc b/examples/step-68/step-68.cc
index 38bd36561b..58d49c5bd7 100644
--- a/examples/step-68/step-68.cc
+++ b/examples/step-68/step-68.cc
@@ -541,6 +541,7 @@ namespace Step68
     Vector<double> local_dof_values(fluid_fe.dofs_per_cell);
 
     FEPointEvaluation<dim, dim> evaluator(mapping, fluid_fe, update_values);
+    std::vector<Point<dim>>     particle_positions;
 
     // We loop over all the local particles. Although this could be achieved
     // directly by looping over all the cells, this would force us
@@ -564,7 +565,7 @@ namespace Step68
         // This is achieved using FEPointEvaluation object.
         const auto pic = particle_handler.particles_in_cell(cell);
         Assert(pic.begin() == particle, ExcInternalError());
-        std::vector<Point<dim>> particle_positions;
+        particle_positions.clear();
         for (auto &p : pic)
           particle_positions.push_back(p.get_reference_location());
 
diff --git a/tests/performance/timing_step_68.cc b/tests/performance/timing_step_68.cc
index 632fbf9711..3527985f4f 100644
--- a/tests/performance/timing_step_68.cc
+++ b/tests/performance/timing_step_68.cc
@@ -324,6 +324,7 @@ namespace Step68
     Vector<double> local_dof_values(fluid_fe.dofs_per_cell);
 
     FEPointEvaluation<dim, dim> evaluator(mapping, fluid_fe, update_values);
+    std::vector<Point<dim>>     particle_positions;
 
     const double this_mpi_process =
       static_cast<double>(Utilities::MPI::this_mpi_process(mpi_communicator));
@@ -339,7 +340,7 @@ namespace Step68
 
         const auto pic = particle_handler.particles_in_cell(cell);
         Assert(pic.begin() == particle, ExcInternalError());
-        std::vector<Point<dim>> particle_positions;
+        particle_positions.clear();
         for (auto &p : pic)
           particle_positions.push_back(p.get_reference_location());