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/*
 * First find your offload target, and if xnack is enabled/disabled using

   rocminfo | grep amdgcn

 * It should output a string like so:

   "Name:                    amdgcn-amd-amdhsa--gfx942:sramecc+:xnack-"

 * This lists the offload taret (gfx942) and that xnack is disabled (xnack-).
 * Therefore, we need to specify --offload-arch=gfx942:xnack- to our link and compile commands.
 * Please modify the compile and link commands to suit your system

 * To compile:
   hipcc -c -fgpu-rdc -x hip rocshmem_init_attr_test.cc \
         --offload-arch=<target>:<xnack>                \
         -I/opt/rocm/include                            \
         -I$ROCSHMEM_INSTALL_DIR/include                \
         -I$OPENMPI_UCX_INSTALL_DIR/include/

 * To link:
   hipcc -fgpu-rdc --hip-link rocshmem_init_attr_test.o -o rocshmem_init_attr_test \
         --offload-arch=<target>:<xnack>                                           \
         $ROCSHMEM_INSTALL_DIR/lib/librocshmem.a                                   \
         $OPENMPI_UCX_INSTALL_DIR/lib/libmpi.so                                    \
         -L/opt/rocm/lib -lamdhip64 -lhsa-runtime64

 * To run:
   mpirun -np 8 -x ROCSHMEM_MAX_NUM_CONTEXTS=2 ./rocshmem_init_attr_test

 * Note:
    running this test with the Reverse Offload (RO) conduit requires setting
                  ROCSHMEM_UNIQUEID_WITH_MPI=1

 */

#include <rocshmem/rocshmem.hpp>
#include <mpi.h>

#include "util.h"

using namespace rocshmem;

int main (int argc, char **argv)
{
    int world_rank, world_nranks;
    int ret;
    rocshmem_uniqueid_t uid;
    rocshmem_init_attr_t attr;
    int provided;

    MPI_Init_thread (&argc, &argv, MPI_THREAD_MULTIPLE, &provided);
    if (provided != MPI_THREAD_MULTIPLE) {
      std::cerr << "MPI_THREAD_MULTIPLE support disabled.\n";
    }
    MPI_Comm_rank (MPI_COMM_WORLD, &world_rank);
    MPI_Comm_size (MPI_COMM_WORLD, &world_nranks);

    // Create two disjoint groups of processes, each
    // one creating a unique rocshmem environment independent
    // of the other group
    MPI_Comm newcomm;
    int color = world_rank %2;
    int rank, nranks;

    MPI_Comm_split(MPI_COMM_WORLD, color, world_rank, &newcomm);
    MPI_Comm_rank (newcomm, &rank);
    MPI_Comm_size (newcomm, &nranks);

    if (rank == 0) {
      ret = rocshmem_get_uniqueid (&uid);
      if (ret != ROCSHMEM_SUCCESS) {
        std::cout << rank << ": Error in rocshmem_get_uniqueid. Aborting.\n";
        MPI_Abort (MPI_COMM_WORLD, ret);
      }
    }

    MPI_Bcast (&uid, sizeof(rocshmem_uniqueid_t), MPI_BYTE, 0, newcomm);
    ret = rocshmem_set_attr_uniqueid_args(rank, nranks, &uid, &attr);
    if (ret != ROCSHMEM_SUCCESS) {
      std::cout << rank << ": Error in rocshmem_set_attr_uniqueid_args. Aborting.\n";
      MPI_Abort (MPI_COMM_WORLD, ret);
    }

    ret = rocshmem_init_attr(ROCSHMEM_INIT_WITH_UNIQUEID, &attr);
    if (ret != ROCSHMEM_SUCCESS) {
      std::cout << rank << ": Error in rocshmem_init_attr. Aborting.\n";
      MPI_Abort (MPI_COMM_WORLD, ret);
    }

    std::cout << rank << ": rocshmem_init_attr SUCCESS\n";

    rocshmem_finalize();
    MPI_Comm_free (&newcomm);
    MPI_Finalize();
    return 0;
}