my_mpi Module Reference

Public Member Functions
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)

Member Function/Subroutine Documentation

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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subroutine my_mpi::my_mpi_init

(

integer, intent(in)

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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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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The documentation for this module was generated from the following file:

• /u/gitlab-xgc/builds/YGMz2TJ8/0/xgc/XGC-Devel/XGC_core/my_mpi.F90