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//
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//
// Zoltan2: A package of combinatorial algorithms for scientific computing
// Copyright 2012 Sandia Corporation
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/*! \file Zoltan2_PartitioningHelpers.hpp
\brief Helper functions for Partitioning Problems
*/
#ifndef _ZOLTAN2_PARTITIONINGHELPERS_HPP_
#define _ZOLTAN2_PARTITIONINGHELPERS_HPP_
#ifdef _MSC_VER
#define NOMINMAX
#include <windows.h>
#endif
#include <Zoltan2_PartitioningSolution.hpp>
#include <Zoltan2_AlltoAll.hpp>
namespace Zoltan2 {
/*! \brief From a PartitioningSolution, get a list of IDs to be imported.
* Assumes part numbers in PartitioningSolution are to be used
* as rank numbers.
*
* The list returned by solution.getPartListView() is an export list,
* detailing to which part each ID should move. This method provides
* a new list, listing the IDs to be imported
* to this processor.
*
* \param imports on return is the list of global Ids assigned to
* this process under the Solution.
*
* TODO: Add a version that takes a Mapping solution as well for k!=p.
*/
template <typename SolutionAdapter, typename DataAdapter>
size_t getImportList(
const PartitioningSolution<SolutionAdapter> &solution,
const DataAdapter * const data,
ArrayRCP<typename DataAdapter::gno_t> &imports // output
)
{
typedef typename PartitioningSolution<SolutionAdapter>::part_t part_t;
typedef typename PartitioningSolution<SolutionAdapter>::gno_t gno_t;
size_t numParts = solution.getActualGlobalNumberOfParts();
int numProcs = solution.getCommunicator()->getSize();
if (numParts > size_t(numProcs)) {
char msg[256];
sprintf(msg, "Number of parts %lu exceeds number of ranks %d; "
"%s requires a MappingSolution for this case\n",
numParts, numProcs, __func__);
throw std::logic_error(msg);
}
size_t localNumIds = data->getLocalNumIDs();
const typename DataAdapter::gno_t *gids = NULL;
data->getIDsView(gids);
const part_t *parts = solution.getPartListView();
// How many ids to each process?
Array<int> counts(numProcs, 0);
for (size_t i=0; i < localNumIds; i++)
counts[parts[i]]++;
Array<gno_t> offsets(numProcs+1, 0);
for (int i=1; i <= numProcs; i++){
offsets[i] = offsets[i-1] + counts[i-1];
}
Array<typename DataAdapter::gno_t> gidList(localNumIds);
for (size_t i=0; i < localNumIds; i++) {
gno_t idx = offsets[parts[i]];
gidList[idx] = gids[i];
offsets[parts[i]] = idx + 1;
}
Array<int> recvCounts(numProcs, 0);
try {
AlltoAllv<typename DataAdapter::gno_t>(*(solution.getCommunicator()),
*(solution.getEnvironment()),
gidList(), counts(), imports, recvCounts());
}
Z2_FORWARD_EXCEPTIONS;
return imports.size();
}
} // namespace Zoltan2
#endif // _ZOLTAN2_PARTITIONINGHELPERS_HPP_
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