Begin using Mac runners

.github/workflows/build-mac.yml

@@ -0,0 +1,58 @@
+name: Install and test Firedrake (macOS)
+
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+    # By default this workflow is run on the "opened", "synchronize" and
+    # "reopened" events. We add "labelled" so it will run if the PR is given a label.
+    types: [opened, synchronize, reopened, labeled]
+
+concurrency:
+  # Cancels jobs running if new commits are pushed
+  group: >
+    ${{ github.workflow }}-
+    ${{ github.event.pull_request.number || github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  build:
+    name: Build Firedrake (macOS)
+    runs-on: [self-hosted, macOS]
+    # Only run this action if we are pushing to master or the PR is labelled "macOS"
+    if: ${{ (github.ref == 'refs/heads/master') || contains(github.event.pull_request.labels.*.name, 'macOS') }}
+    env:
+      FIREDRAKE_CI_TESTS: 1  # needed to symlink the checked out branch into the venv
+      OMP_NUM_THREADS: 1
+      OPENBLAS_NUM_THREADS: 1
+    steps:
+      - name: Add homebrew to PATH
+        # https://docs.github.com/en/actions/writing-workflows/choosing-what-your-workflow-does/workflow-commands-for-github-actions#adding-a-system-path
+        run: echo "/opt/homebrew/bin" >> "$GITHUB_PATH"
+      - uses: actions/checkout@v4
+      - name: Pre-run cleanup
+        if: ${{ always() }}
+        run: |
+          cd ..
+          rm -rf firedrake_venv
+      - name: Install Python
+        run: brew install python python-setuptools
+      - name: Build Firedrake
+        run: |
+          cd ..
+          "$(brew --prefix)/bin/python3" \
+            firedrake/scripts/firedrake-install \
+            --venv-name firedrake_venv \
+            --disable-ssh \
+            || (cat firedrake-install.log && /bin/false)
+      - name: Run smoke tests
+        run: |
+          . ../firedrake_venv/bin/activate
+          python -m pytest -v tests/firedrake/regression/ -k "poisson_strong or stokes_mini or dg_advection"
+        timeout-minutes: 30
+      - name: Post-run cleanup
+        if: ${{ always() }}
+        run: |
+          cd ..
+          rm -rf firedrake_venv

.github/workflows/pip-mac.yml

@@ -0,0 +1,124 @@
+name: Pip install Firedrake (macOS)
+
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+    # By default this workflow is run on the "opened", "synchronize" and
+    # "reopened" events. We add "labelled" so it will run if the PR is given a label.
+    types: [opened, synchronize, reopened, labeled]
+
+concurrency:
+  # Cancels jobs running if new commits are pushed
+  group: >
+    ${{ github.workflow }}-
+    ${{ github.event.pull_request.number || github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  build:
+    name: "Build Firedrake using pip (macOS)"
+    runs-on: [self-hosted, macOS]
+    # Only run this action if we are pushing to master or the PR is labelled "macOS"
+    if: ${{ (github.ref == 'refs/heads/master') || contains(github.event.pull_request.labels.*.name, 'macOS') }}
+    env:
+      OMP_NUM_THREADS: 1
+      OPENBLAS_NUM_THREADS: 1
+    steps:
+      - name: Cleanup (pre)
+        if: ${{ always() }}
+        run: rm -rf pip_venv
+
+      - name: Add homebrew to PATH
+        # https://docs.github.com/en/actions/writing-workflows/choosing-what-your-workflow-does/workflow-commands-for-github-actions#adding-a-system-path
+        run: echo "/opt/homebrew/bin" >> "$GITHUB_PATH"
+
+      - name: Install homebrew packages
+        run: brew install gcc autoconf pkg-config make automake cmake ninja libtool boost openblas python python-setuptools mpich
+
+      - name: Create a virtual environment
+        run: |
+          "$(brew --prefix)/bin/python3" -m venv pip_venv
+          mkdir pip_venv/src
+
+      - name: Install PETSc
+        run: |
+          cd pip_venv/src
+          git clone https://github.com/firedrakeproject/petsc.git
+          cd petsc
+          ./configure PETSC_DIR="$PWD" PETSC_ARCH=default \
+            --with-shared-libraries=1 \
+            --with-mpi-dir=/opt/homebrew \
+            --with-zlib \
+            --download-bison \
+            --download-hdf5 \
+            --download-hwloc \
+            --download-hypre \
+            --download-metis \
+            --download-mumps \
+            --download-netcdf \
+            --download-pastix \
+            --download-pnetcdf \
+            --download-ptscotch \
+            --download-scalapack \
+            --download-suitesparse \
+            --download-superlu_dist
+          make
+
+      - name: Install libsupermesh
+        run: |
+          source pip_venv/bin/activate
+          pip install 'rtree>=1.2'
+          cd pip_venv/src
+          git clone https://github.com/firedrakeproject/libsupermesh.git
+          mkdir -p libsupermesh/build
+          cd libsupermesh/build
+          cmake .. \
+            -DBUILD_SHARED_LIBS=ON \
+            -DCMAKE_INSTALL_PREFIX="$VIRTUAL_ENV" \
+            -DMPI_C_COMPILER=/opt/homebrew/bin/mpicc \
+            -DMPI_CXX_COMPILER=/opt/homebrew/bin/mpicxx \
+            -DMPI_Fortran_COMPILER=/opt/homebrew/bin/mpif90 \
+            -DCMAKE_Fortran_COMPILER=/opt/homebrew/bin/mpif90 \
+            -DMPIEXEC_EXECUTABLE=/opt/homebrew/bin/mpiexec
+          make
+          make install
+
+      - uses: actions/checkout@v4
+        with:
+          path: pip_venv/src/firedrake
+
+      - name: Pip install
+        run: |
+          export PETSC_DIR="$PWD/pip_venv/src/petsc"
+          export PETSC_ARCH=default
+          export HDF5_DIR="$PETSC_DIR/$PETSC_ARCH"
+          export HDF5_MPI=ON
+          export CC=/opt/homebrew/bin/mpicc
+          export CXX=/opt/homebrew/bin/mpicxx
+          export MPICC="$CC"
+          source pip_venv/bin/activate
+          cd pip_venv/src
+          pip install \
+            --log=firedrake-install.log \
+            --no-cache \
+            --no-binary mpi4py,h5py \
+            -v -e './firedrake[test]'
+
+      - name: Install CI-specific test dependencies
+        run: |
+          source pip_venv/bin/activate
+          pip install -U pytest-timeout
+
+      - name: Run Firedrake smoke tests
+        run: |
+          source pip_venv/bin/activate
+          cd pip_venv/src/firedrake
+          pytest --timeout=1800 -v tests/firedrake/regression \
+            -k "poisson_strong or stokes_mini or dg_advection"
+        timeout-minutes: 30
+
+      - name: Cleanup (post)
+        if: ${{ always() }}
+        run: rm -rf pip_venv

docs/source/download.rst

@@ -229,10 +229,10 @@ type::
 
 You should now be able to run ``firedrake-update``.
 
-Installing Firedrake with pip (experimental, Linux only)
+Installing Firedrake with pip (experimental)
 --------------------------------------------------------
 
-Firedrake has experimental support for installing using ``pip``, avoiding the need for the ``firedrake-install`` script. At present only Linux is tested using this install method.
+Firedrake has experimental support for installing using ``pip``, avoiding the need for the ``firedrake-install`` script.
 
 Requirements
 ~~~~~~~~~~~~

pyproject.toml

@@ -16,8 +16,12 @@ requires-python = ">=3.10"
 dependencies = [
   "cachetools",
   "decorator<=4.4.2",
-  "mpi4py",
-  "h5py",
+  "mpi4py>3; python_version >= '3.13'",
+  "mpi4py; python_version < '3.13'",
+  # TODO: We are only using our fork here because the most recent PyPI release
+  # does not yet work with build isolation for Python 3.13. Once a version
+  # newer than 3.12.1 is released we can revert to simply using "h5py".
+  "h5py @ git+https://github.com/firedrakeproject/h5py.git",
   "petsc4py",
   "numpy",
   "packaging",
@@ -91,7 +95,8 @@ requires = [
   "pybind11",
   "pkgconfig",
   "numpy",
-  "mpi4py",
+  "mpi4py>3; python_version >= '3.13'",
+  "mpi4py; python_version < '3.13'",
   "petsc4py",
   "rtree>=1.2",
 ]

setup.py

@@ -1,16 +1,17 @@
-from dataclasses import dataclass, field
-from setuptools import setup, find_packages, Extension
-from glob import glob
-from pathlib import Path
-from Cython.Build import cythonize
 import os
+import platform
 import sys
 import site
 import numpy as np
 import pybind11
 import petsc4py
 import rtree
 import pkgconfig
+from dataclasses import dataclass, field
+from setuptools import setup, find_packages, Extension
+from glob import glob
+from pathlib import Path
+from Cython.Build import cythonize
 
 # Define the compilers to use if not already set
 if "CC" not in os.environ:
@@ -87,7 +88,14 @@ def __getitem__(self, key):
 # Pybind11
 # example:
 # gcc -I/pyind11/include ...
-pybind11_ = ExternalDependency(include_dirs=[pybind11.get_include()])
+pybind11_extra_compile_args = []
+if platform.uname().system == "Darwin":
+    # Clang needs to specify at least C++11
+    pybind11_extra_compile_args.append("-std=c++11")
+pybind11_ = ExternalDependency(
+    include_dirs=[pybind11.get_include()],
+    extra_compile_args=pybind11_extra_compile_args,
+)
 
 # numpy
 # example:
@@ -225,7 +233,6 @@ def extensions():
     ## PYBIND11 EXTENSIONS
     pybind11_list = []
     # tinyasm/tinyasm.cpp: petsc, pybind11
-    # tinyasm/tinyasm.cpp: petsc, pybind11
     pybind11_list.append(Extension(
         name="tinyasm._tinyasm",
         language="c++",

tests/firedrake/regression/test_dg_advection.py

@@ -39,7 +39,14 @@ def run_test(mesh):
     T = 10*dt
 
     problem = LinearVariationalProblem(a_mass, action(arhs, D1), dD1)
-    solver = LinearVariationalSolver(problem, solver_parameters={'ksp_type': 'cg'})
+    solver = LinearVariationalSolver(
+        problem,
+        solver_parameters={
+            'ksp_type': 'cg',
+            # specify superlu_dist as MUMPS fails in parallel on MacOS
+            'pc_factor_mat_solver_type': 'superlu_dist',
+        }
+    )
 
     L2_0 = norm(D)
     Dbar_0 = assemble(D*dx)

tests/firedrake/regression/test_poisson_strong_bcs.py

@@ -18,7 +18,7 @@
 from firedrake import *
 
 
-def run_test(r, degree, parameters={}, quadrilateral=False):
+def run_test(r, degree, parameters, quadrilateral=False):
     # Create mesh and define function space
     mesh = UnitSquareMesh(2 ** r, 2 ** r, quadrilateral=quadrilateral)
     x = SpatialCoordinate(mesh)
@@ -41,7 +41,7 @@ def run_test(r, degree, parameters={}, quadrilateral=False):
     return sqrt(assemble(inner(u - f, u - f) * dx))
 
 
-def run_test_linear(r, degree, parameters={}, quadrilateral=False):
+def run_test_linear(r, degree, parameters, quadrilateral=False):
     # Create mesh and define function space
     mesh = UnitSquareMesh(2 ** r, 2 ** r, quadrilateral=quadrilateral)
     x = SpatialCoordinate(mesh)
@@ -86,7 +86,7 @@ def test_poisson_analytic_linear(params, degree, quadrilateral):
 
 @pytest.mark.parallel(nprocs=2)
 def test_poisson_analytic_linear_parallel():
-    from mpi4py import MPI
-    error = run_test_linear(1, 1)
-    print('[%d]' % MPI.COMM_WORLD.rank, 'error:', error)
+    # specify superlu_dist as MUMPS fails in parallel on MacOS
+    solver_parameters = {'pc_factor_mat_solver_type': 'superlu_dist'}
+    error = run_test_linear(1, 1, solver_parameters)
     assert error < 5e-6