Zoltan2_BasicKokkosIdentifierAdapter.hpp

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// @HEADER
// *****************************************************************************
//   Zoltan2: A package of combinatorial algorithms for scientific computing
//
// Copyright 2012 NTESS and the Zoltan2 contributors.
// SPDX-License-Identifier: BSD-3-Clause
// *****************************************************************************
// @HEADER

#ifndef _ZOLTAN2_BASICKOKKOSIDENTIFIERADAPTER_HPP_
#define _ZOLTAN2_BASICKOKKOSIDENTIFIERADAPTER_HPP_

#include <Kokkos_Core.hpp>
#include <Zoltan2_IdentifierAdapter.hpp>
#include <Zoltan2_StridedData.hpp>

using Kokkos::ALL;

namespace Zoltan2 {

template <typename User>
  class BasicKokkosIdentifierAdapter: public IdentifierAdapter<User> {

public:
  typedef typename InputTraits<User>::scalar_t scalar_t;
  typedef typename InputTraits<User>::lno_t    lno_t;
  typedef typename InputTraits<User>::gno_t    gno_t;
  typedef typename InputTraits<User>::part_t   part_t;
  typedef typename InputTraits<User>::node_t   node_t;
  typedef typename node_t::device_type         device_t;
  typedef User user_t;

  BasicKokkosIdentifierAdapter(
    Kokkos::View<gno_t*, device_t> &ids,
    Kokkos::View<scalar_t**, device_t> &weights);

  // The Adapter interface.

  size_t getLocalNumIDs() const override {
    return idsView_.extent(0);
  }

  void getIDsView(const gno_t *&ids) const override {
    auto kokkosIds = idsView_.view_host();
    ids = kokkosIds.data();
  }

  void getIDsKokkosView(Kokkos::View<const gno_t *, device_t> &ids) const override {
    ids = idsView_.view_device();
  }

  int getNumWeightsPerID() const override {
    return weightsView_.extent(1);
  }

  void getWeightsView(const scalar_t *&wgt, int &stride,
                      int idx = 0) const override
  {
    auto h_wgts_2d = weightsView_.view_host();

    wgt = Kokkos::subview(h_wgts_2d, Kokkos::ALL, idx).data();
    stride = 1;
  }

  void getWeightsKokkosView(Kokkos::View<scalar_t **, device_t> &wgts) const override {
    wgts = weightsView_.template view<device_t>();
  }

private:
  Kokkos::DualView<gno_t *, device_t> idsView_;
  Kokkos::DualView<scalar_t **, device_t> weightsView_;
};

// Definitions

template <typename User>
BasicKokkosIdentifierAdapter<User>::BasicKokkosIdentifierAdapter(
    Kokkos::View<gno_t *, device_t> &ids,
    Kokkos::View<scalar_t **, device_t> &weights)
{
  idsView_ = Kokkos::DualView<gno_t *, device_t>("idsView_", ids.extent(0));
  Kokkos::deep_copy(idsView_.view_host(), ids);

  weightsView_ = Kokkos::DualView<scalar_t **, device_t>("weightsView_",
                                                         weights.extent(0),
                                                         weights.extent(1));
  Kokkos::deep_copy(weightsView_.view_host(), weights);

  weightsView_.modify_host();
  weightsView_.sync_host();
  weightsView_.template sync<device_t>();

  idsView_.modify_host();
  idsView_.sync_host();
  idsView_.template sync<device_t>();
}

} //namespace Zoltan2

#endif