PartitionerTest< PartitionerSubclass, MeshClass > Class Template Reference

#include <partitioner_test.h>

Inheritance diagram for PartitionerTest< PartitionerSubclass, MeshClass >:

Public Member Functions
void	setUp ()
void	tearDown ()
void	testPartition (processor_id_type n_parts)
void	testPartitionEmpty ()
void	testPartition1 ()
void	testPartition2 ()
void	testPartitionNProc ()

Detailed Description

template<typename PartitionerSubclass, typename MeshClass>
class PartitionerTest< PartitionerSubclass, MeshClass >

Definition at line 31 of file partitioner_test.h.

Member Function Documentation

setUp()

template<typename PartitionerSubclass , typename MeshClass >

void PartitionerTest< PartitionerSubclass, MeshClass >::setUp

(

)

Definition at line 33 of file partitioner_test.h.

  {}

tearDown()

template<typename PartitionerSubclass , typename MeshClass >

void PartitionerTest< PartitionerSubclass, MeshClass >::tearDown

(

)

Definition at line 36 of file partitioner_test.h.

  {}

testPartition()

template<typename PartitionerSubclass , typename MeshClass >

void PartitionerTest< PartitionerSubclass, MeshClass >::testPartition

(

processor_id_type

n_parts

)

Definition at line 39 of file partitioner_test.h.

References libMesh::MeshTools::Generation::build_cube(), libMesh::HEX8, std::min(), and TestCommWorld.

  {
    MeshClass mesh(*TestCommWorld);

    MeshTools::Generation::build_cube (mesh,
                                       3, 3, 3,
                                       0., 1., 0., 1., 0., 1.,
                                       HEX8);

    // FIXME: Splitting meshes into more than n_proc parts currently
    // requires us to start with a mesh entirely assigned to proc 0
    PartitionerSubclass newpart;
    newpart.partition(mesh, 1);

    for (auto elem : mesh.element_ptr_range())
      CPPUNIT_ASSERT_EQUAL(elem->processor_id(), processor_id_type(0));

    for (auto node : mesh.node_ptr_range())
      CPPUNIT_ASSERT_EQUAL(node->processor_id(), processor_id_type(0));

    // But then we can manually partition, into at most many parts as
    // were requested.
    newpart.partition(mesh, n_parts);

    // We expect the partitioner not to suck - every processor
    // rank (up to n_elem()) ought to have at least one element on it.
    const processor_id_type n_nonempty =
      std::min(n_parts, processor_id_type(3*3*3));

    // Let's make sure we can see them all even on a DistributedMesh
    mesh.allgather();

    processor_id_type nonempty_procs = 0;
    for (processor_id_type p=0; p != n_nonempty; ++p)
      {
        const std::size_t n_elem_on_p =
          std::distance(mesh.pid_elements_begin(p),
                        mesh.pid_elements_end(p));
        if (n_elem_on_p)
          nonempty_procs++;
      }

    // Unfortunately, it turns out that our METIS and ParMETIS
    // partitioners *do* suck, and can't reliabily give us more than
    // 13 non-empty ranks on the above 27 element mesh.
    CPPUNIT_ASSERT(nonempty_procs >= n_nonempty ||
                   nonempty_procs >= 13);
  }

testPartition1()

template<typename PartitionerSubclass , typename MeshClass >

void PartitionerTest< PartitionerSubclass, MeshClass >::testPartition1

(

)

Definition at line 98 of file partitioner_test.h.

  {
    this->testPartition(1);
  }

testPartition2()

template<typename PartitionerSubclass , typename MeshClass >

void PartitionerTest< PartitionerSubclass, MeshClass >::testPartition2

(

)

Definition at line 103 of file partitioner_test.h.

  {
    this->testPartition(2);
  }

testPartitionEmpty()

template<typename PartitionerSubclass , typename MeshClass >

void PartitionerTest< PartitionerSubclass, MeshClass >::testPartitionEmpty

(

)

Definition at line 88 of file partitioner_test.h.

References libMesh::Parallel::Communicator::size(), and TestCommWorld.

  {
    MeshClass mesh(*TestCommWorld);
    PartitionerSubclass newpart;

    // With a 0 element mesh this should just give us 0 subpartitions
    // regardless of n_procs
    newpart.partition(mesh, TestCommWorld->size());
  }

testPartitionNProc()

template<typename PartitionerSubclass , typename MeshClass >

void PartitionerTest< PartitionerSubclass, MeshClass >::testPartitionNProc

(

)

Definition at line 108 of file partitioner_test.h.

References libMesh::Parallel::Communicator::size(), and TestCommWorld.

  {
    this->testPartition(TestCommWorld->size());
  }

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The documentation for this class was generated from the following file:

• tests/partitioning/partitioner_test.h