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Copy pathCSRMatrix.hpp
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135 lines (117 loc) · 4.01 KB
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#ifndef _CSRMatrix_hpp_
#define _CSRMatrix_hpp_
//@HEADER
// ************************************************************************
//
// HPCCG: Simple Conjugate Gradient Benchmark Code
// Copyright (2006) Sandia Corporation
//
// Under terms of Contract DE-AC04-94AL85000, there is a non-exclusive
// license for use of this work by or on behalf of the U.S. Government.
//
// This library is free software; you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as
// published by the Free Software Foundation; either version 2.1 of the
// License, or (at your option) any later version.
//
// This library is distributed in the hope that it will be useful, but
// WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
// USA
// Questions? Contact Michael A. Heroux (maherou@sandia.gov)
//
// ************************************************************************
//@HEADER
#include <cstddef>
#include <vector>
#include <algorithm>
#ifdef HAVE_MPI
#include <mpi.h>
#endif
namespace miniFE {
template<typename Scalar,
typename LocalOrdinal,
typename GlobalOrdinal>
struct
CSRMatrix {
CSRMatrix()
: has_local_indices(false),
rows(), row_offsets(), row_offsets_external(),
packed_cols(), packed_coefs(),
num_cols(0)
#ifdef HAVE_MPI
,external_index(), external_local_index(), elements_to_send(),
neighbors(), recv_length(), send_length(), send_buffer(), request()
#endif
{
}
~CSRMatrix()
{}
typedef Scalar ScalarType;
typedef LocalOrdinal LocalOrdinalType;
typedef GlobalOrdinal GlobalOrdinalType;
bool has_local_indices;
std::vector<GlobalOrdinal> rows;
std::vector<LocalOrdinal> row_offsets;
std::vector<LocalOrdinal> row_offsets_external;
std::vector<GlobalOrdinal> packed_cols;
std::vector<Scalar> packed_coefs;
LocalOrdinal num_cols;
#ifdef HAVE_MPI
std::vector<GlobalOrdinal> external_index;
std::vector<GlobalOrdinal> external_local_index;
std::vector
66DE
<GlobalOrdinal> elements_to_send;
std::vector<int> neighbors;
std::vector<LocalOrdinal> recv_length;
std::vector<LocalOrdinal> send_length;
std::vector<Scalar> send_buffer;
std::vector<MPI_Request> request;
#endif
size_t num_nonzeros() const
{
return row_offsets[row_offsets.size()-1];
}
void reserve_space(unsigned nrows, unsigned ncols_per_row)
{
rows.resize(nrows);
row_offsets.resize(nrows+1);
packed_cols.reserve(nrows * ncols_per_row);
packed_coefs.reserve(nrows * ncols_per_row);
}
void get_row_pointers(GlobalOrdinalType row, size_t& row_length,
GlobalOrdinalType*& cols,
ScalarType*& coefs)
{
ptrdiff_t local_row = -1;
//first see if we can get the local-row index using fast direct lookup:
if (rows.size() >= 1) {
ptrdiff_t idx = row - rows[0];
if (idx < rows.size() && rows[idx] == row) {
local_row = idx;
}
}
//if we didn't get the local-row index using direct lookup, try a
//more expensive binary-search:
if (local_row == -1) {
typename std::vector<GlobalOrdinal>::iterator row_iter =
std::lower_bound(rows.begin(), rows.end(), row);
//if we still haven't found row, it's not local so jump out:
if (row_iter == rows.end() || *row_iter != row) {
row_length = 0;
return;
}
local_row = row_iter - rows.begin();
}
LocalOrdinalType offset = row_offsets[local_row];
row_length = row_offsets[local_row+1] - offset;
cols = &packed_cols[offset];
coefs = &packed_coefs[offset];
}
};
}//namespace miniFE
#endif