| 1 | int MPI_Reduce(void* _sendbuf, void* _recvbuf, int _count, MPI_Datatype _datatype,
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| 2 | MPI_Op _op, int _root, MPI_Comm _comm) {
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| 3 | int _i;
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| 4 | int _j;
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| 5 | double _tempBuffer[_count];
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| 6 | int _rank;
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| 7 | int _nprocs;
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| 8 |
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| 9 | #pragma TASS assert MPIX_State == MPIX_INITIALIZED, "Attempt to call MPI_Reduce when MPI is not initialized";
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| 10 | #pragma TASS assert _op == MPI_SUM;
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| 11 | #pragma TASS assert _datatype == MPI_DOUBLE;
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| 12 | MPI_Comm_rank(MPI_COMM_WORLD, &_rank);
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| 13 | MPI_Comm_size(MPI_COMM_WORLD, &_nprocs);
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| 14 | if (_rank == _root) {
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| 15 | for (_j=0; _j<_count; _j++) _tempBuffer[_j] = ((double*)_sendbuf)[_j];
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| 16 | for (_i=0; _i<_nprocs; _i++) {
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| 17 | if (_i != _root) {
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| 18 | MPI_Recv(_recvbuf, _count, _datatype, _i, MPIX_REDUCE_TAG,
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| 19 | _comm, MPI_STATUS_IGNORE);
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| 20 | for(_j=0; _j<_count; _j++) _tempBuffer[_j] += ((double*)_recvbuf)[_j];
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| 21 | }
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| 22 | }
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| 23 | for (_j=0; _j<_count; _j++) ((double*)_recvbuf)[_j]=_tempBuffer[_j];
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| 24 | } else {
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| 25 | MPI_Send(_sendbuf, _count, _datatype, _root, MPIX_REDUCE_TAG, _comm);
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| 26 | }
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| 27 | return 0;
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| 28 | }
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| 29 |
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| 30 | /* For now: just doubles and sum */
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| 31 | int MPI_Allreduce(void* _sendbuf, void* _recvbuf, int _count, MPI_Datatype _datatype,
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| 32 | MPI_Op _op, MPI_Comm _comm) {
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| 33 | int _i;
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| 34 | int _j;
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| 35 | double _tempBuffer[_count];
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| 36 |
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| 37 | #pragma TASS assert MPIX_State == MPIX_INITIALIZED, "Attempt to call MPI_Allreduce when MPI is not initialized";
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| 38 | #pragma TASS assert _op == MPI_SUM;
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| 39 | #pragma TASS assert _datatype == MPI_DOUBLE;
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| 40 | if (PID == 0) {
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| 41 | for (_j=0; _j<_count; _j++) _tempBuffer[_j] = ((double*)_sendbuf)[_j];
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| 42 | for (_i=1; _i<NPROCS; _i++) {
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| 43 | MPI_Recv(_recvbuf, _count, _datatype, _i, MPIX_ALLREDUCE_TAG,
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| 44 | _comm, MPI_STATUS_IGNORE);
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| 45 | for(_j=0; _j<_count; _j++) _tempBuffer[_j] += ((double*)_recvbuf)[_j];
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| 46 | }
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| 47 | for (_j=0; _j<_count; _j++) ((double*)_recvbuf)[_j]=_tempBuffer[_j];
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| 48 | for (_i=1; _i<NPROCS; _i++) {
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| 49 | MPI_Send(_recvbuf, _count, _datatype, _i, MPIX_ALLREDUCE_TAG, _comm);
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| 50 | }
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| 51 | } else {
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| 52 | MPI_Send(_sendbuf, _count, _datatype, 0, MPIX_ALLREDUCE_TAG, _comm);
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| 53 | MPI_Recv(_recvbuf, _count, _datatype, 0, MPIX_ALLREDUCE_TAG, _comm,
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| 54 | MPI_STATUS_IGNORE);
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| 55 | }
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| 56 | return 0;
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| 57 | }
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