simplepart.h

// Copyright 2009-2025 NTESS. Under the terms
// of Contract DE-NA0003525 with NTESS, the U.S.
// Government retains certain rights in this software.
//
// Copyright (c) 2009-2025, NTESS
// All rights reserved.
//
// This file is part of the SST software package. For license
// information, see the LICENSE file in the top level directory of the
// distribution.

#ifndef SST_CORE_IMPL_PARTITONERS_SIMPLEPART_H
#define SST_CORE_IMPL_PARTITONERS_SIMPLEPART_H

#include "sst/core/configGraph.h"
#include "sst/core/eli/elementinfo.h"
#include "sst/core/sst_types.h"
#include "sst/core/sstpart.h"

#include <cstdint>
#include <map>

namespace SST::IMPL::Partition {

class SimplePartitioner : public SST::Partition::SSTPartitioner
{

public:
    SST_ELI_REGISTER_PARTITIONER(
        SimplePartitioner,
        "sst",
        "simple",
        SST_ELI_ELEMENT_VERSION(1,0,0),
        "Simple partitioning scheme which attempts to partition on high latency links "
        "while balancing number of components per rank.")

private:
    RankInfo world_size;
    uint32_t total_parts;

    RankInfo convertPartNum(uint32_t partNum)
    {
        return RankInfo(partNum / world_size.thread, partNum % world_size.thread);
    }

    void simple_partition_step(PartitionComponentMap_t& component_map, ComponentId_t* setA, const int lengthA,
        int rankA, ComponentId_t* setB, const int lengthB, int rankB,
        std::map<ComponentId_t, std::map<ComponentId_t, SimTime_t>*> timeTable, int step);

public:
    SimplePartitioner(RankInfo total_ranks, RankInfo my_rank, int verbosity);
    SimplePartitioner();
    ~SimplePartitioner() {}

    void performPartition(PartitionGraph* graph) override;

    bool requiresConfigGraph() override { return false; }
    bool spawnOnAllRanks() override { return false; }
};

} // namespace SST::IMPL::Partition

#endif // SST_CORE_IMPL_PARTITONERS_SIMPLERPART_H