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Install parallel h5py with no build isolation #3782

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Merged
GuySten merged 5 commits into from
Feb 8, 2026
Merged

Install parallel h5py with no build isolation #3782

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64281db
Force parallel h5py installation with setuptools<81
paulromano Feb 7, 2026
540d332
Use --no-build-isolation after installing setuptools<81
paulromano Feb 7, 2026
0ff62ae
Make sure data::mg gets cleared on finalize
paulromano Feb 7, 2026
f81cc56
Add h5py build-system dependencies
paulromano Feb 8, 2026
417492c
Minimize preinstall reqs for h5py
paulromano Feb 8, 2026
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2 changes: 2 additions & 0 deletions src/finalize.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -14,6 +14,7 @@
#include "openmc/material.h"
#include "openmc/mesh.h"
#include "openmc/message_passing.h"
#include "openmc/mgxs_interface.h"
#include "openmc/nuclide.h"
#include "openmc/photon.h"
#include "openmc/plot.h"
Expand Down Expand Up @@ -163,6 +164,7 @@ int openmc_finalize()
data::energy_min = {0.0, 0.0, 0.0, 0.0};
data::temperature_min = 0.0;
data::temperature_max = INFTY;
data::mg = {};
model::root_universe = -1;
model::plotter_seed = 1;
openmc::openmc_set_seed(DEFAULT_SEED);
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4 changes: 3 additions & 1 deletion tools/ci/gha-install.sh
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Expand Up @@ -39,7 +39,9 @@ if [[ $MPI == 'y' ]]; then
export CC=mpicc
export HDF5_MPI=ON
export HDF5_DIR=/usr/lib/x86_64-linux-gnu/hdf5/mpich
pip install --no-binary=h5py h5py
# Install h5py without build isolation to pick up already installed mpi4py
pip install Cython pkgconfig
pip install --no-build-isolation --no-binary=h5py h5py
fi

# Build and install OpenMC executable
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