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UnitTestElemSuppAlg.C
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UnitTestElemSuppAlg.C
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#include <gtest/gtest.h>
#include <limits>
#include <random>
#include "UnitTestUtils.h"
#include <stk_mesh/base/MetaData.hpp>
#include <stk_mesh/base/BulkData.hpp>
#include <stk_mesh/base/CoordinateSystems.hpp>
#include <stk_mesh/base/Field.hpp>
#include <stk_mesh/base/FieldBLAS.hpp>
#include <stk_mesh/base/NgpMesh.hpp>
#include <master_element/MasterElementFactory.h>
#include <stk_util/parallel/Parallel.hpp>
#include <Kokkos_Core.hpp>
#include <ElemDataRequests.h>
#include <ScratchViews.h>
#include <ngp_utils/NgpFieldManager.h>
#include "UnitTestKokkosUtils.h"
namespace {
#ifndef KOKKOS_ENABLE_CUDA
void element_discrete_laplacian_kernel_3d(
sierra::nalu::MasterElement& meSCS,
const ScalarFieldType* discreteLaplacianOfPressure,
const ScalarFieldType* nodalPressureField,
sierra::nalu::ScratchViews<double>& elemData)
{
const int nDim = 3;
const int nodesPerElem = meSCS.nodesPerElement_;
const int numScsIp = meSCS.num_integration_points();
const int* lrscv = meSCS.adjacentNodes();
sierra::nalu::SharedMemView<double*>& elemNodePressures = elemData.get_scratch_view_1D(*nodalPressureField);
sierra::nalu::SharedMemView<double**>& scs_areav =
elemData.get_me_views(sierra::nalu::CURRENT_COORDINATES).scs_areav;
sierra::nalu::SharedMemView<double***>& dndx =
elemData.get_me_views(sierra::nalu::CURRENT_COORDINATES).dndx;
stk::mesh::NgpMesh::ConnectedNodes elemNodes = elemData.elemNodes;
for (int ip = 0; ip < numScsIp; ++ip ) {
double dpdxIp = 0.0;
for ( int ic = 0; ic < nodesPerElem; ++ic) {
for ( int j = 0; j < nDim; ++j ) {
dpdxIp += dndx(ip, ic, j)*elemNodePressures(ic)*scs_areav(ip,j);
}
}
EXPECT_TRUE(std::abs(dpdxIp) > tol);
const stk::mesh::Entity lNode = elemNodes[lrscv[2*ip+0]];
const stk::mesh::Entity rNode = elemNodes[lrscv[2*ip+1]];
Kokkos::atomic_add(stk::mesh::field_data(*discreteLaplacianOfPressure, lNode), dpdxIp);
Kokkos::atomic_add(stk::mesh::field_data(*discreteLaplacianOfPressure, rNode), -dpdxIp);
}
}
class SuppAlg
{
public:
virtual ~SuppAlg(){}
virtual void elem_execute(stk::topology topo,
sierra::nalu::MasterElement& meSCS,
sierra::nalu::ScratchViews<double>& elemData) = 0;
};
class DiscreteLaplacianSuppAlg : public SuppAlg
{
public:
DiscreteLaplacianSuppAlg(sierra::nalu::ElemDataRequests& dataNeeded,
const VectorFieldType* coordField,
const ScalarFieldType* discreteLaplacianOfPressure,
const ScalarFieldType* nodalPressureField,
const stk::topology &topo)
: discreteLaplacianOfPressure_(discreteLaplacianOfPressure),
nodalPressureField_(nodalPressureField)
{
// add the master element
sierra::nalu::MasterElement* meSCS = sierra::nalu::MasterElementRepo::get_surface_master_element(topo);
dataNeeded.add_cvfem_surface_me(meSCS);
//here are the element-data pre-requisites we want computed before
//our elem_execute method is called.
dataNeeded.add_coordinates_field(*coordField, 3,
sierra::nalu::CURRENT_COORDINATES);
dataNeeded.add_master_element_call(sierra::nalu::SCS_AREAV,
sierra::nalu::CURRENT_COORDINATES);
dataNeeded.add_master_element_call(sierra::nalu::SCS_GRAD_OP,
sierra::nalu::CURRENT_COORDINATES);
dataNeeded.add_gathered_nodal_field(*nodalPressureField, 1);
}
virtual ~DiscreteLaplacianSuppAlg() {}
virtual void elem_execute(stk::topology /* topo */,
sierra::nalu::MasterElement& meSCS,
sierra::nalu::ScratchViews<double>& elemData)
{
element_discrete_laplacian_kernel_3d(meSCS,
discreteLaplacianOfPressure_, nodalPressureField_, elemData);
}
private:
const ScalarFieldType* discreteLaplacianOfPressure_;
const ScalarFieldType* nodalPressureField_;
};
//=========== Test class that mimics an element alg with supplemental alg and views ========
//
class TestElemAlgorithmWithSuppAlgViews
{
public:
TestElemAlgorithmWithSuppAlgViews(stk::mesh::BulkData& bulk)
: suppAlgs_(),
dataNeededByKernels_(bulk.mesh_meta_data()),
bulkData_(bulk)
{}
void execute()
{
const stk::mesh::MetaData& meta = bulkData_.mesh_meta_data();
const stk::mesh::BucketVector& elemBuckets = bulkData_.get_buckets(stk::topology::ELEM_RANK, meta.locally_owned_part());
stk::mesh::NgpMesh ngpMesh(bulkData_);
sierra::nalu::nalu_ngp::FieldManager fieldMgr(bulkData_);
sierra::nalu::ElemDataRequestsGPU dataNeededNGP(fieldMgr, dataNeededByKernels_, meta.get_fields().size());
const int bytes_per_team = 0;
const int bytes_per_thread = sierra::nalu::get_num_bytes_pre_req_data<double>(dataNeededNGP, meta.spatial_dimension(), sierra::nalu::ElemReqType::ELEM);
auto team_exec = sierra::nalu::get_host_team_policy(elemBuckets.size(), bytes_per_team, bytes_per_thread);
Kokkos::parallel_for(team_exec, [&](const sierra::nalu::TeamHandleType& team)
{
const stk::mesh::Bucket& bkt = *elemBuckets[team.league_rank()];
stk::topology topo = bkt.topology();
sierra::nalu::MasterElement* meSCS = dataNeededNGP.get_cvfem_surface_me();
sierra::nalu::ScratchViews<double> prereqData(team, meta.spatial_dimension(), topo.num_nodes(), dataNeededNGP);
Kokkos::parallel_for(Kokkos::TeamThreadRange(team, bkt.size()), [&](const size_t& jj)
{
fill_pre_req_data(dataNeededNGP, ngpMesh, stk::topology::ELEMENT_RANK, bkt[jj], prereqData);
fill_master_element_views(dataNeededNGP, prereqData);
for(SuppAlg* alg : suppAlgs_) {
alg->elem_execute(topo, *meSCS, prereqData);
}
});
});
}
std::vector<SuppAlg*> suppAlgs_;
sierra::nalu::ElemDataRequests dataNeededByKernels_;
private:
stk::mesh::BulkData& bulkData_;
};
TEST_F(Hex8Mesh, elem_supp_alg_views)
{
fill_mesh_and_initialize_test_fields("generated:20x20x20");
TestElemAlgorithmWithSuppAlgViews testAlgorithm(bulk);
//DiscreteLapacianSuppAlg constructor says which data it needs, by inserting
//things into the 'dataNeededByKernels_' container.
// find a topo, assume this is a homogeneous hex8 mesh
for (size_t k = 0; k < partVec.size(); ++k )
if ( partVec[k]->topology() != stk::topology::HEX_8 ) {
throw std::runtime_error("UnitTestElemSuppAlg only supports a homogeneous HEX8 mesh: " + partVec[k]->topology().name());
}
stk::topology partTopo = partVec[0]->topology();
SuppAlg* suppAlg = new DiscreteLaplacianSuppAlg(testAlgorithm.dataNeededByKernels_,
coordField,
discreteLaplacianOfPressure, nodalPressureField, partTopo);
testAlgorithm.suppAlgs_.push_back(suppAlg);
testAlgorithm.execute();
check_discrete_laplacian(exactLaplacian);
delete suppAlg;
}
//end of stuff that's ifndef'd for KOKKOS_ENABLE_CUDA
#endif
}