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//=====================================================
// Copyright (C) 2011 Andrea Arteaga <andyspiros@gmail.com>
//=====================================================
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License
// as published by the Free Software Foundation; either version 2
// of the License, or (at your option) any later version.
//
// This program 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 General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
//
#ifndef BTL_BLACS_INTERFACE_H
#define BTL_BLACS_INTERFACE_H
#include <vector>
#include <algorithm>
#include "blacs.h"
extern "C" {
void descinit_(int*, const int*, const int*, const int*, const int*, const int*, const int*, const int*, const int*, int*);
int numroc_(const int*, const int*, const int*, const int*, const int*);
}
#include "scatter.h"
#include "gather.h"
template<typename real>
class blacs_interface
{
public:
typedef real real_type;
typedef std::vector<real_type> stl_vector;
typedef stl_vector stl_matrix;
typedef real* gene_matrix;
typedef real* gene_vector;
static void free_matrix(gene_matrix & A, int N){
delete A;
}
static void free_vector(gene_vector & B){
delete B;
}
static inline void matrix_from_stl(gene_matrix & A, stl_matrix & A_stl){
int N = A_stl.size();
A = new real[N];
for (int j=0;j<N;j++)
A[j] = A_stl[j];
}
static inline void vector_from_stl(gene_vector & B, stl_vector & B_stl){
int N = B_stl.size();
B = new real[N];
for (int i=0;i<N;i++)
B[i] = B_stl[i];
}
static inline void vector_to_stl(gene_vector & B, stl_vector & B_stl){
int N = B_stl.size();
for (int i=0;i<N;i++)
B_stl[i] = B[i];
}
static inline void matrix_to_stl(gene_matrix & A, stl_matrix & A_stl){
int N = A_stl.size();
for (int i=0;i<N;i++)
A_stl[i] = A[i];
}
static inline void copy_vector(const gene_vector & source, gene_vector & cible, int N){
for (int i=0;i<N;i++)
cible[i]=source[i];
}
static inline void copy_matrix(const gene_matrix & source, gene_matrix & cible, int N){
for (int i=0;i<N;i++)
cible[i]=source[i];
}
public:
static int context() {
int ctxt, ignored, what = 0;
blacs_get_(&ignored, &what, &ctxt);
return ctxt;
}
static int myid() {
int procnum, myid;
blacs_pinfo_(&myid, &procnum);
return myid;
}
static void scatter_matrix(const stl_vector& GlobalMatrix, stl_vector& LocalMatrix,
int& GlobalRows, int& GlobalCols,
int& BlockRows, int& BlockCols,
int& LocalRows, int& LocalCols
) {
scatter(context(), GlobalMatrix, LocalMatrix, GlobalRows, GlobalCols, BlockRows, BlockCols, LocalRows, LocalCols);
}
static void scatter_matrix(const stl_vector& GlobalMatrix, stl_vector& LocalMatrix,
int *desc,
const int& GlobalRows=0, const int& GlobalCols=0,
const int& BlockRows=0, const int& BlockCols=0
) {
int GlobalRows_ = GlobalRows, GlobalCols_ = GlobalCols,
BlockRows_ = BlockRows, BlockCols_ = BlockCols,
LocalRows_, LocalCols_;
const int ctxt = context();
scatter(ctxt, GlobalMatrix, LocalMatrix,
GlobalRows_, GlobalCols_, BlockRows_, BlockCols_, LocalRows_, LocalCols_
);
const int iZERO = 0;
int info;
const int LLD = std::max(1, LocalRows_);
descinit_(desc, &GlobalRows_, &GlobalCols_, &BlockRows_, &BlockCols_,
&iZERO, &iZERO, &ctxt, &LLD, &info
);
}
static void gather_matrix(stl_vector& GlobalMatrix, const stl_vector& LocalMatrix,
int& GlobalRows, int& GlobalCols,
int& BlockRows, int& BlockCols,
int& LocalRows, int& LocalCols
) {
gather(context(), GlobalMatrix, LocalMatrix, GlobalRows, GlobalCols, BlockRows, BlockCols, LocalRows, LocalCols);
}
static void gather_matrix(stl_vector& GlobalMatrix, const stl_vector& LocalMatrix,
int* desc
) {
int GlobalRows = desc[2], GlobalCols = desc[3],
BlockRows = desc[4], BlockCols = desc[5],
LocalRows = desc[8], LocalCols = LocalMatrix.size()/desc[8];
const int ctxt = context();
gather(ctxt, GlobalMatrix, LocalMatrix, GlobalRows, GlobalCols, BlockRows, BlockCols, LocalRows, LocalCols);
}
};
#endif /* BTL_BLACS_INTERFACE_H */
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