Functions/Subroutines | |
| subroutine | my_mpi_init (color) |
| XGC common MPI init routine. More... | |
| subroutine | my_mpi_reduce (a, b, n) |
| subroutine | my_mpi_allreduce (a, b, n) |
Function/Subroutine Documentation
◆ my_mpi_allreduce()
| subroutine my_mpi::my_mpi_allreduce | ( | real (kind=8), dimension(n), intent(inout) | a, |
| real (kind=8), dimension(n), intent(inout) | b, | ||
| integer, intent(in) | n | ||
| ) |
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◆ my_mpi_init()
| subroutine my_mpi::my_mpi_init | ( | integer, intent(in), value | color | ) |
XGC common MPI init routine.
This function will call MPI_init followed by MPI_Comm_split. This is necessary to use Adios2 MPMD-style staging methods (e.g., InSituMPI). To distinguish XGC and staging applications, we need to provide an identifier (color). XGC applications (XGC1 and XGCa) will use "0", while others need to use non-zero values. After calling this function, it is recommended not to use MPI_COMM_WORLD directly. Instead, sml_comm_world or sml_comm should be used. E.g., PETSC should be initialized with sml_comm_world, not MPI_COMM_WORLD, as follows: call petsc_init(sml_comm_world, ierr)
- Parameters
-
[in] color identifier, integer
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◆ my_mpi_reduce()
| subroutine my_mpi::my_mpi_reduce | ( | real (kind=8), dimension(n), intent(inout) | a, |
| real (kind=8), dimension(n), intent(inout) | b, | ||
| integer, intent(in) | n | ||
| ) |
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