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stable MPI.COMM_WORLD for scaling out to hundreds of node #100

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stable MPI.COMM_WORLD for scaling out to hundreds of node #100

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6ebb2eb
large scale stable MPI
Jan 12, 2023
64c95c3
[pre-commit.ci] auto fixes from pre-commit.com hooks
pre-commit-ci[bot] Jan 12, 2023
9a124a1
Merge branch 'main' into main
kmpaul May 6, 2024
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13 changes: 6 additions & 7 deletions dask_mpi/core.py
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Original file line number Diff line number Diff line change
Expand Up @@ -10,6 +10,7 @@


def initialize(
comm,
interface=None,
nthreads=1,
local_directory=None,
Expand All @@ -20,7 +21,6 @@ def initialize(
protocol=None,
worker_class="distributed.Worker",
worker_options=None,
comm=None,
exit=True,
):
"""
Expand All @@ -38,6 +38,8 @@ def initialize(

Parameters
----------
comm: mpi4py.MPI.Intracomm
Optional MPI communicator to use instead of COMM_WORLD
interface : str
Network interface like 'eth0' or 'ib0'
nthreads : int
Expand All @@ -59,8 +61,6 @@ def initialize(
Class to use when creating workers
worker_options : dict
Options to pass to workers
comm: mpi4py.MPI.Intracomm
Optional MPI communicator to use instead of COMM_WORLD
exit: bool
Whether to call sys.exit on the workers and schedulers when the event
loop completes.
Expand All @@ -71,10 +71,9 @@ def initialize(
Only returned if exit=False. Inidcates whether this rank should continue
to run client code (True), or if it acts as a scheduler or worker (False).
"""
if comm is None:
from mpi4py import MPI

comm = MPI.COMM_WORLD
assert (
comm is not None
), "MPI Comm World needs to be created before import distributed."

world_size = comm.Get_size()
if world_size < 3:
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