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Support MPI parallelism in R2SManager #3632

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Merged
pshriwise merged 14 commits into from
Nov 19, 2025
Merged

Support MPI parallelism in R2SManager #3632

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c816dee
Add timing data
paulromano Sep 25, 2025
c7879b3
Support running R2SManager.run with mpi4py
paulromano Sep 27, 2025
7faa04b
Fix parallelization for neutron/photon transport
paulromano Sep 30, 2025
f6765fc
Fix TemporarySession parallel invocation
paulromano Oct 1, 2025
64471d6
Make TemporarySession compatible with MPI
paulromano Oct 1, 2025
b67591d
Have depletion results loaded directly rather than broadcasting
paulromano Oct 3, 2025
ab5b2be
Call photon transport from within TemporarySession
paulromano Oct 4, 2025
b455de6
Add cwd argument to TemporarySession
paulromano Oct 6, 2025
b5ac11a
Use specified cwd for photon transport step
paulromano Oct 6, 2025
8fc7d3b
Clean up tmp_dir properly from TemporarySession
paulromano Oct 12, 2025
27044cf
Have each rank open statepoint in get_microxs_and_flux
paulromano Nov 6, 2025
3411f56
Remove timing
paulromano Nov 12, 2025
c8ee3d4
Add comments
paulromano Nov 12, 2025
ee286de
Simplification suggested by @pshriwise
paulromano Nov 18, 2025
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Add cwd argument to TemporarySession
  • Loading branch information
@paulromano
paulromano committed Nov 12, 2025
commit b455de6c5ea13d3fea8ca1639a6fcece6f9aba07
27 changes: 18 additions & 9 deletions openmc/lib/core.py
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Original file line number Diff line number Diff line change
Expand Up @@ -633,6 +633,9 @@ class TemporarySession:
model : openmc.Model, optional
OpenMC model to use for the session. If None, a minimal working model is
created.
cwd : PathLike, optional
Working directory in which to run OpenMC. If None, a temporary directory
is created and deleted automatically.
**init_kwargs
Keyword arguments to pass to :func:`openmc.lib.init`.

Expand All @@ -644,8 +647,9 @@ class TemporarySession:
The MPI intracommunicator used for the session.

"""
def __init__(self, model=None, **init_kwargs):
def __init__(self, model=None, cwd=None, **init_kwargs):
self.init_kwargs = init_kwargs
self.cwd = cwd
if model is None:
surf = openmc.Sphere(boundary_type="vacuum")
cell = openmc.Cell(region=-surf)
Expand All @@ -668,16 +672,21 @@ def __enter__(self):
# Store original working directory
self.orig_dir = Path.cwd()

# Set up temporary directory
if self.comm.rank == 0:
self.tmp_dir = TemporaryDirectory()
path_str = self.tmp_dir.name
if self.cwd is None:
# Set up temporary directory
if self.comm.rank == 0:
self.tmp_dir = TemporaryDirectory()
path_str = self.tmp_dir.name
else:
path_str = None

# Broadcast the string path
path_str = self.comm.bcast(path_str)
working_dir = Path(path_str)
else:
path_str = None
working_dir = Path(self.cwd)

# Broadcast the string path
path_str = self.comm.bcast(path_str)
working_dir = Path(path_str)
# Create and change to specified directory
working_dir.mkdir(parents=True, exist_ok=True)
os.chdir(working_dir)

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