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mpi: Add utility to get number of ranks on a single node #2265

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Nov 14, 2023
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mpi: Add utility to get number of ranks on a single node #2265

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32718bc
mpi: add utility to get number of ranks on a single node
mloubout Nov 13, 2023
bf9a4b1
examples: add buoyancy to all preset models for easier use
mloubout Nov 13, 2023
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10 changes: 10 additions & 0 deletions devito/mpi/distributed.py
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Original file line number Diff line number Diff line change
Expand Up @@ -256,6 +256,16 @@ def nprocs(self):
else:
return 1

@property
def nprocs_local(self):
if self.comm is not MPI.COMM_NULL:
local_comm = MPI.Comm.Split_type(self.comm, MPI.COMM_TYPE_SHARED)
node_size = local_comm.Get_size()
local_comm.Free()
return node_size
else:
return 1

@property
def topology(self):
return self._topology
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1 change: 1 addition & 0 deletions tests/test_mpi.py
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Expand Up @@ -35,6 +35,7 @@ def test_partitioning(self):
}
assert f.shape == expected[distributor.nprocs][distributor.myrank]
assert f.size_global == 225
assert distributor.nprocs_local == distributor.nprocs

@pytest.mark.parallel(mode=[2, 4])
def test_partitioning_fewer_dims(self):
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