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BoxMeshPartition.hpp
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BoxMeshPartition.hpp
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/*
//@HEADER
// ************************************************************************
//
// Kokkos v. 2.0
// Copyright (2014) Sandia Corporation
//
// Under the terms of Contract DE-AC04-94AL85000 with Sandia Corporation,
// the U.S. Government retains certain rights in this software.
//
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// modification, are permitted provided that the following conditions are
// met:
//
// 1. Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
//
// 3. Neither the name of the Corporation nor the names of the
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY SANDIA CORPORATION "AS IS" AND ANY
// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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// Questions? Contact H. Carter Edwards (hcedwar@sandia.gov)
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*/
#ifndef BOXMESHPARTITION_HPP
#define BOXMESHPARTITION_HPP
#include <cstddef>
#include <utility>
#include <vector>
#include <iostream>
//----------------------------------------------------------------------------
struct BoxType {
size_t data[3][2] ;
typedef size_t range_type[2] ;
inline
const range_type & operator[]( size_t i ) const { return data[i]; }
inline
range_type & operator[]( size_t i ) { return data[i]; }
inline
bool operator == ( const BoxType & rhs ) const
{
return data[0][0] == rhs.data[0][0] && data[0][1] == rhs.data[0][1] &&
data[1][0] == rhs.data[1][0] && data[1][1] == rhs.data[2][1] &&
data[2][0] == rhs.data[2][0] && data[2][1] == rhs.data[2][1] ;
}
inline
bool operator != ( const BoxType & rhs ) const
{
return data[0][0] != rhs.data[0][0] || data[0][1] != rhs.data[0][1] ||
data[1][0] != rhs.data[1][0] || data[1][1] != rhs.data[1][1] ||
data[2][0] != rhs.data[2][0] || data[2][1] != rhs.data[2][1] ;
}
};
inline
size_t count( const BoxType & b )
{
size_t n = 1 ;
for ( size_t i = 0 ; i < 3 ; ++i ) {
n *= b[i][1] > b[i][0] ? b[i][1] - b[i][0] : 0 ;
}
return n ;
}
inline
bool contain( const BoxType & b , size_t i , size_t j , size_t k )
{
return b[0][0] <= i && i < b[0][1] &&
b[1][0] <= j && j < b[1][1] &&
b[2][0] <= k && k < b[2][1] ;
}
inline
BoxType intersect( const BoxType & x , const BoxType & y )
{
BoxType z ;
for ( size_t i = 0 ; i < 3 ; ++i ) {
z[i][0] = std::max( x[i][0] , y[i][0] );
z[i][1] = std::min( x[i][1] , y[i][1] );
}
return z ;
}
inline
std::ostream & operator << ( std::ostream & s , const BoxType & box )
{
s << "{ "
<< box[0][0] << " " << box[0][1] << " , "
<< box[1][0] << " " << box[1][1] << " , "
<< box[2][0] << " " << box[2][1] << " }" ;
return s ;
}
//----------------------------------------------------------------------------
class BoxBounds {
public:
/** \brief Default bounds to one layer of ghosting */
virtual
void apply( const BoxType & box_global ,
const BoxType & box_part ,
BoxType & box_interior ,
BoxType & box_use ) const = 0 ;
virtual ~BoxBounds() {}
BoxBounds() {}
};
class BoxBoundsLinear : public BoxBounds
{
public:
/** \brief Default bounds to one layer of ghosting */
virtual
void apply( const BoxType & box_global ,
const BoxType & box_part ,
BoxType & box_interior ,
BoxType & box_use ) const ;
virtual ~BoxBoundsLinear() {}
BoxBoundsLinear() {}
};
class BoxBoundsQuadratic : public BoxBounds {
public:
/** \brief Quadratic mesh: even ordinates have two layers,
* odd ordinates have one layer.
*/
virtual
void apply( const BoxType & box_global ,
const BoxType & box_part ,
BoxType & box_interior ,
BoxType & box_use ) const ;
virtual ~BoxBoundsQuadratic() {}
BoxBoundsQuadratic() {}
};
//----------------------------------------------------------------------------
/* Partition box into part_boxes.size() sub-boxes */
void box_partition_rcb( const BoxType & root_box ,
std::vector<BoxType> & part_boxes );
//----------------------------------------------------------------------------
/* Determine local id layout and communication maps for partitioned boxes.
*
* Local ids are layed out as follows:
* { [ owned-interior ids not sent ] ,
* [ owned-boundary ids to be sent to other processes ] ,
* [ received ids from processor ( my_part + 1 ) % part_count ]
* [ received ids from processor ( my_part + 2 ) % part_count ]
* [ received ids from processor ( my_part + 3 ) % part_count ]
* ... };
*
* This layout allows
* (1) received data to be copied into a contiguous block of memory
* (2) send data to be extracted from a contiguous block of memory.
*/
void box_partition_maps(
const BoxType & root_box , // [in] Global box
const std::vector<BoxType> & part_boxes , // [in] Partitioned boxes
const BoxBounds & use_boxes , // [in] Ghost boundaries
const size_t my_part , // [in] My local part
BoxType & my_use_box , // [out] My used box with ghost
std::vector<size_t> & my_use_id_map , // [out] Local ordering map
size_t & my_count_interior , // [out] How many interior
size_t & my_count_owned , // [out] How many owned
size_t & my_count_uses , // [out] How may used
std::vector<size_t> & my_part_counts , // [out] Partitioning of my_use_id_map
std::vector<std::vector<size_t> > & my_send_map ); // [out] Send id map
/* Mapping of cartesian coordinate to local id */
size_t box_map_id( const BoxType & my_use_box ,
const std::vector<size_t> & my_use_id_map ,
const size_t global_i ,
const size_t global_j ,
const size_t global_k );
//----------------------------------------------------------------------------
#endif /* #ifndef BOXMESHPARTITION_HPP */

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