/usr/include/libmesh/parallel_ghost_sync.h is in libmesh-dev 0.7.1-2ubuntu1.
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// The libMesh Finite Element Library.
// Copyright (C) 2002-2008 Benjamin S. Kirk, John W. Peterson, Roy H. Stogner
// 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
#ifndef __parallel_ghost_sync_h__
#define __parallel_ghost_sync_h__
// C++ Includes -----------------------------------
// Local Includes -----------------------------------
#include "auto_ptr.h"
#include "elem.h"
#include "location_maps.h"
#include "mesh_base.h"
#include "parallel.h"
namespace libMesh
{
//--------------------------------------------------------------------------
namespace Parallel {
//------------------------------------------------------------------------
/**
* Request data about a range of ghost nodes uniquely identified by
* their xyz location or a range of active ghost elements uniquely
* identified by their centroids' xyz location. Fulfill requests
* with
* sync.gather_data(const std::vector<unsigned int>& ids,
* std::vector<sync::datum>& data),
* by resizing and setting the values of the data vector.
* Respond to fulfillment with
* sync.act_on_data(const std::vector<unsigned int>& ids,
* std::vector<sync::datum>& data)
* The user must define Parallel::datatype<sync::datum> if
* sync::datum isn't a built-in type.
* The user-provided location_map will be used and left unchanged
* if it is provided, or filled and cleared if it is empty.
*/
template <typename Iterator,
typename DofObjType,
typename SyncFunctor>
void sync_dofobject_data_by_xyz(const Iterator& range_begin,
const Iterator& range_end,
LocationMap<DofObjType>* location_map,
SyncFunctor& sync);
//------------------------------------------------------------------------
/**
* Request data about a range of ghost dofobjects uniquely
* identified by their id. Fulfill requests with
* sync.gather_data(const std::vector<unsigned int>& ids,
* std::vector<sync::datum>& data),
* by resizing and setting the values of the data vector.
* Respond to fulfillment with
* sync.act_on_data(const std::vector<unsigned int>& ids,
* std::vector<sync::datum>& data)
* The user must define Parallel::datatype<sync::datum> if
* sync::datum isn't a built-in type.
*/
template <typename Iterator,
typename SyncFunctor>
void sync_dofobject_data_by_id(const Iterator& range_begin,
const Iterator& range_end,
SyncFunctor& sync);
//------------------------------------------------------------------------
/**
* Request data about a range of ghost elements uniquely
* identified by their parent id and which child they are.
* Fulfill requests with
* sync.gather_data(const std::vector<unsigned int>& ids,
* std::vector<sync::datum>& data),
* by resizing and setting the values of the data vector.
* Respond to fulfillment with
* sync.act_on_data(const std::vector<unsigned int>& ids,
* std::vector<sync::datum>& data)
* The user must define Parallel::datatype<sync::datum> if
* sync::datum isn't a built-in type.
*/
template <typename Iterator,
typename SyncFunctor>
void sync_element_data_by_parent_id(MeshBase& mesh,
const Iterator& range_begin,
const Iterator& range_end,
SyncFunctor& sync);
//------------------------------------------------------------------------
// Parallel members
template <typename Iterator,
typename DofObjType,
typename SyncFunctor>
void sync_dofobject_data_by_xyz(const Iterator& range_begin,
const Iterator& range_end,
LocationMap<DofObjType>& location_map,
SyncFunctor& sync)
{
// This function must be run on all processors at once
parallel_only();
// We need a valid location_map
#ifdef DEBUG
bool need_map_update = (range_begin != range_end && location_map.empty());
Parallel::max(need_map_update);
libmesh_assert(!need_map_update);
#endif
// Count the objectss to ask each processor about
std::vector<unsigned int>
ghost_objects_from_proc(libMesh::n_processors(), 0);
for (Iterator it = range_begin; it != range_end; ++it)
{
DofObjType *obj = *it;
libmesh_assert (obj);
unsigned int obj_procid = obj->processor_id();
libmesh_assert (obj_procid != DofObject::invalid_processor_id);
ghost_objects_from_proc[obj_procid]++;
}
// Request sets to send to each processor
std::vector<std::vector<Real> >
requested_objs_x(libMesh::n_processors()),
requested_objs_y(libMesh::n_processors()),
requested_objs_z(libMesh::n_processors());
// Corresponding ids to keep track of
std::vector<std::vector<unsigned int> >
requested_objs_id(libMesh::n_processors());
// We know how many objects live on each processor, so reserve()
// space for each.
for (unsigned int p=0; p != libMesh::n_processors(); ++p)
if (p != libMesh::processor_id())
{
requested_objs_x[p].reserve(ghost_objects_from_proc[p]);
requested_objs_y[p].reserve(ghost_objects_from_proc[p]);
requested_objs_z[p].reserve(ghost_objects_from_proc[p]);
requested_objs_id[p].reserve(ghost_objects_from_proc[p]);
}
for (Iterator it = range_begin; it != range_end; ++it)
{
DofObjType *obj = *it;
unsigned int obj_procid = obj->processor_id();
if (obj_procid == libMesh::processor_id())
continue;
Point p = location_map.point_of(*obj);
requested_objs_x[obj_procid].push_back(p(0));
requested_objs_y[obj_procid].push_back(p(1));
requested_objs_z[obj_procid].push_back(p(2));
requested_objs_id[obj_procid].push_back(obj->id());
}
// Trade requests with other processors
for (unsigned int p=1; p != libMesh::n_processors(); ++p)
{
// Trade my requests with processor procup and procdown
unsigned int procup = (libMesh::processor_id() + p) %
libMesh::n_processors();
unsigned int procdown = (libMesh::n_processors() +
libMesh::processor_id() - p) %
libMesh::n_processors();
std::vector<Real> request_to_fill_x,
request_to_fill_y,
request_to_fill_z;
Parallel::send_receive(procup, requested_objs_x[procup],
procdown, request_to_fill_x);
Parallel::send_receive(procup, requested_objs_y[procup],
procdown, request_to_fill_y);
Parallel::send_receive(procup, requested_objs_z[procup],
procdown, request_to_fill_z);
// Find the local id of each requested object
std::vector<unsigned int> request_to_fill_id(request_to_fill_x.size());
for (unsigned int i=0; i != request_to_fill_x.size(); ++i)
{
Point p(request_to_fill_x[i],
request_to_fill_y[i],
request_to_fill_z[i]);
// Look for this object in the multimap
DofObjType *obj = location_map.find(p);
// We'd better find every object we're asked for
libmesh_assert (obj);
// Return the object's correct processor id,
// and our (correct if it's local) id for it.
request_to_fill_id[i] = obj->id();
}
// Gather whatever data the user wants
std::vector<typename SyncFunctor::datum> data;
sync.gather_data(request_to_fill_id, data);
// Trade back the results
std::vector<typename SyncFunctor::datum> received_data;
Parallel::send_receive(procdown, data,
procup, received_data);
libmesh_assert(requested_objs_x[procup].size() ==
received_data.size());
// Let the user process the results
sync.act_on_data(requested_objs_id[procup], received_data);
}
}
template <typename Iterator,
typename SyncFunctor>
void sync_dofobject_data_by_id(const Iterator& range_begin,
const Iterator& range_end,
SyncFunctor& sync)
{
// This function must be run on all processors at once
parallel_only();
// Count the objects to ask each processor about
std::vector<unsigned int>
ghost_objects_from_proc(libMesh::n_processors(), 0);
for (Iterator it = range_begin; it != range_end; ++it)
{
DofObject *obj = *it;
libmesh_assert (obj);
unsigned int obj_procid = obj->processor_id();
libmesh_assert (obj_procid != DofObject::invalid_processor_id);
ghost_objects_from_proc[obj_procid]++;
}
// Request sets to send to each processor
std::vector<std::vector<unsigned int> >
requested_objs_id(libMesh::n_processors());
// We know how many objects live on each processor, so reserve()
// space for each.
for (unsigned int p=0; p != libMesh::n_processors(); ++p)
if (p != libMesh::processor_id())
{
requested_objs_id[p].reserve(ghost_objects_from_proc[p]);
}
for (Iterator it = range_begin; it != range_end; ++it)
{
DofObject *obj = *it;
unsigned int obj_procid = obj->processor_id();
if (obj_procid == libMesh::processor_id())
continue;
requested_objs_id[obj_procid].push_back(obj->id());
}
// Trade requests with other processors
for (unsigned int p=1; p != libMesh::n_processors(); ++p)
{
// Trade my requests with processor procup and procdown
unsigned int procup = (libMesh::processor_id() + p) %
libMesh::n_processors();
unsigned int procdown = (libMesh::n_processors() +
libMesh::processor_id() - p) %
libMesh::n_processors();
std::vector<unsigned int> request_to_fill_id;
Parallel::send_receive(procup, requested_objs_id[procup],
procdown, request_to_fill_id);
// Gather whatever data the user wants
std::vector<typename SyncFunctor::datum> data;
sync.gather_data(request_to_fill_id, data);
// Trade back the results
std::vector<typename SyncFunctor::datum> received_data;
Parallel::send_receive(procdown, data,
procup, received_data);
libmesh_assert(requested_objs_id[procup].size() ==
received_data.size());
// Let the user process the results
sync.act_on_data(requested_objs_id[procup], received_data);
}
}
// If there's no refined elements, there's nothing to sync
#ifdef LIBMESH_ENABLE_AMR
template <typename Iterator,
typename SyncFunctor>
void sync_element_data_by_parent_id(MeshBase& mesh,
const Iterator& range_begin,
const Iterator& range_end,
SyncFunctor& sync)
{
// This function must be run on all processors at once
parallel_only();
// Count the objects to ask each processor about
std::vector<unsigned int>
ghost_objects_from_proc(libMesh::n_processors(), 0);
for (Iterator it = range_begin; it != range_end; ++it)
{
DofObject *obj = *it;
libmesh_assert (obj);
unsigned int obj_procid = obj->processor_id();
libmesh_assert (obj_procid != DofObject::invalid_processor_id);
ghost_objects_from_proc[obj_procid]++;
}
// Request sets to send to each processor
std::vector<std::vector<unsigned int> >
requested_objs_id(libMesh::n_processors()),
requested_objs_parent_id(libMesh::n_processors()),
requested_objs_child_num(libMesh::n_processors());
// We know how many objects live on each processor, so reserve()
// space for each.
for (unsigned int p=0; p != libMesh::n_processors(); ++p)
if (p != libMesh::processor_id())
{
requested_objs_id[p].reserve(ghost_objects_from_proc[p]);
requested_objs_parent_id[p].reserve(ghost_objects_from_proc[p]);
requested_objs_child_num[p].reserve(ghost_objects_from_proc[p]);
}
for (Iterator it = range_begin; it != range_end; ++it)
{
Elem *elem = *it;
unsigned int obj_procid = elem->processor_id();
if (obj_procid == libMesh::processor_id())
continue;
const Elem *parent = elem->parent();
if (!parent || !elem->active())
continue;
requested_objs_id[obj_procid].push_back(elem->id());
requested_objs_parent_id[obj_procid].push_back(parent->id());
requested_objs_child_num[obj_procid].push_back
(parent->which_child_am_i(elem));
}
// Trade requests with other processors
for (unsigned int p=1; p != libMesh::n_processors(); ++p)
{
// Trade my requests with processor procup and procdown
unsigned int procup = (libMesh::processor_id() + p) %
libMesh::n_processors();
unsigned int procdown = (libMesh::n_processors() +
libMesh::processor_id() - p) %
libMesh::n_processors();
std::vector<unsigned int> request_to_fill_parent_id,
request_to_fill_child_num;
Parallel::send_receive(procup, requested_objs_parent_id[procup],
procdown, request_to_fill_parent_id);
Parallel::send_receive(procup, requested_objs_child_num[procup],
procdown, request_to_fill_child_num);
// Find the id of each requested element
unsigned int request_size = request_to_fill_parent_id.size();
std::vector<unsigned int> request_to_fill_id(request_size);
for (unsigned int i=0; i != request_size; ++i)
{
Elem *parent = mesh.elem(request_to_fill_parent_id[i]);
libmesh_assert(parent);
libmesh_assert(parent->has_children());
Elem *child = parent->child(request_to_fill_child_num[i]);
libmesh_assert(child);
libmesh_assert(child->active());
request_to_fill_id[i] = child->id();
}
// Gather whatever data the user wants
std::vector<typename SyncFunctor::datum> data;
sync.gather_data(request_to_fill_id, data);
// Trade back the results
std::vector<typename SyncFunctor::datum> received_data;
Parallel::send_receive(procdown, data,
procup, received_data);
libmesh_assert(requested_objs_id[procup].size() ==
received_data.size());
// Let the user process the results
sync.act_on_data(requested_objs_id[procup], received_data);
}
}
#else
template <typename Iterator,
typename SyncFunctor>
void sync_element_data_by_parent_id(MeshBase&,
const Iterator&,
const Iterator&,
SyncFunctor&)
{
}
#endif // LIBMESH_ENABLE_AMR
}
} // namespace libMesh
#endif // #define __parallel_ghost_sync_h__
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