Distributed memory¶

class meshmode.distributed.MPIMeshDistributor(mpi_comm, manager_rank=0)¶

send_mesh_parts(mesh, part_per_element, num_parts)¶

Parameters

mesh – A Mesh to distribute to other ranks.
part_per_element – A numpy.ndarray containing one integer per element of mesh indicating which part of the partitioned mesh the element is to become a part of.
num_parts – The number of partitions to divide the mesh into.

Sends each partition to a different rank. Returns one partition that was not sent to any other rank.

class meshmode.distributed.MPIBoundaryCommSetupHelper(mpi_comm, actx, local_bdry_conns, bdry_grp_factory)¶

Helper for setting up inter-partition facial data exchange.

__init__(mpi_comm, actx, local_bdry_conns, bdry_grp_factory)¶

Parameters

mpi_comm – An MPI.Intracomm
actx – An array context
local_bdry_conns – A dict mapping remote partition to local_bdry_conn, where local_bdry_conn is a DirectDiscretizationConnection that performs data exchange from the volume to the faces adjacent to partition i_remote_part.
bdry_grp_factory – Group factory to use when creating the remote-to-local boundary connections

complete_some()¶: Returns a dict mapping a subset of remote partitions to remote-to-local boundary connections, where a remote-to-local boundary connection is a DirectDiscretizationConnection that performs data exchange across faces from partition i_remote_part to the local mesh. When an empty dictionary is returned, setup is complete.

meshmode.distributed.get_partition_by_pymetis(mesh, num_parts, *, connectivity='facial', **kwargs)¶

Return a mesh partition created by pymetis.

Parameters

mesh – A meshmode.mesh.Mesh instance
num_parts – the number of parts in the mesh partition
connectivity – the adjacency graph to be used for partitioning. Either "facial" or "nodal" (based on vertices).
kwargs – Passed unmodified to pymetis.part_graph().

Returns

a numpy.ndarray with one entry per element indicating to which partition each element belongs, with entries between 0 and num_parts-1.

Changed in version 2020.2: connectivity was added.

meshmode.distributed.get_connected_partitions(mesh)¶

For a local mesh part in mesh, determine the set of numbers of remote partitions to which this mesh piece is connected.