| |
| //@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 |
| |
| #ifndef HPCCG_H |
| #define HPCCG_H |
| #include "HPC_sparsemv.hpp" |
| #include "ddot.hpp" |
| #include "waxpby.hpp" |
| #include "HPC_Sparse_Matrix.hpp" |
| |
| #ifdef USING_MPI |
| #include "exchange_externals.hpp" |
| #include <mpi.h> // If this routine is compiled with -DUSING_MPI |
| // then include mpi.h |
| #endif |
| int HPCCG(HPC_Sparse_Matrix * A, |
| const double * const b, double * const x, |
| const int max_iter, const double tolerance, int & niters, double & normr, double * times); |
| |
| // this function will compute the Conjugate Gradient... |
| // A <=> Matrix |
| // b <=> constant |
| // xnot <=> initial guess |
| // max_iter <=> how many times we iterate |
| // tolerance <=> specifies how "good"of a value we would like |
| // x <=> used for return value |
| |
| // A is known |
| // x is unknown vector |
| // b is known vector |
| // xnot = 0 |
| // niters is the number of iterations |
| #endif |
