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Backport: Heat Transfer Example: MPI Datatype #3593 #3607

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May 3, 2023
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Backport: Heat Transfer Example: MPI Datatype #3593 #3607

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10 changes: 5 additions & 5 deletions examples/heatTransfer/write/HeatTransfer.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -136,7 +136,7 @@ void HeatTransfer::exchange(MPI_Comm comm)
{
// Build a custom MPI type for the column vector to allow strided access
MPI_Datatype tColumnVector;
MPI_Type_vector(m_s.ndx + 2, 1, m_s.ndy + 2, MPI_REAL8, &tColumnVector);
MPI_Type_vector(m_s.ndx + 2, 1, m_s.ndy + 2, MPI_DOUBLE, &tColumnVector);
MPI_Type_commit(&tColumnVector);

// Exchange ghost cells, in the order left-right-up-down
Expand Down Expand Up @@ -184,14 +184,14 @@ void HeatTransfer::exchange(MPI_Comm comm)
{
// std::cout << "Rank " << m_s.rank << " send down to rank "
// << m_s.rank_down << std::endl;
MPI_Send(m_TCurrent[m_s.ndx], m_s.ndy + 2, MPI_REAL8, m_s.rank_down,
MPI_Send(m_TCurrent[m_s.ndx], m_s.ndy + 2, MPI_DOUBLE, m_s.rank_down,
tag, comm);
}
if (m_s.rank_up >= 0)
{
// std::cout << "Rank " << m_s.rank << " receive from above from rank "
// << m_s.rank_up << std::endl;
MPI_Recv(m_TCurrent[0], m_s.ndy + 2, MPI_REAL8, m_s.rank_up, tag, comm,
MPI_Recv(m_TCurrent[0], m_s.ndy + 2, MPI_DOUBLE, m_s.rank_up, tag, comm,
&status);
}

Expand All @@ -202,13 +202,13 @@ void HeatTransfer::exchange(MPI_Comm comm)
// std::cout << "Rank " << m_s.rank << " send up to rank " <<
// m_s.rank_up
// << std::endl;
MPI_Send(m_TCurrent[1], m_s.ndy + 2, MPI_REAL8, m_s.rank_up, tag, comm);
MPI_Send(m_TCurrent[1], m_s.ndy + 2, MPI_DOUBLE, m_s.rank_up, tag, comm);
}
if (m_s.rank_down >= 0)
{
// std::cout << "Rank " << m_s.rank << " receive from below from rank "
// << m_s.rank_down << std::endl;
MPI_Recv(m_TCurrent[m_s.ndx + 1], m_s.ndy + 2, MPI_REAL8, m_s.rank_down,
MPI_Recv(m_TCurrent[m_s.ndx + 1], m_s.ndy + 2, MPI_DOUBLE, m_s.rank_down,
tag, comm, &status);
}
}
Expand Down