Navier-Stokes with Eulerian SUPG momentum transport, and a partition-independent cell size (#687) #1436
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| name: test_uw3 | |
| # Build + test on every PR / push to main / development. | |
| # | |
| # Uses pixi (with the committed pixi.lock) for a deterministic, fast install | |
| # rather than micromamba + environment.yaml, which had been backtracking for | |
| # 60+ minutes on conda-forge solves and timing the runner out before tests | |
| # could start. The pixi.lock matches what local development uses, so CI now | |
| # runs against the same dependency state developers see. | |
| on: | |
| push: | |
| branches: | |
| - main | |
| - development | |
| - Quick_Start_Docs | |
| pull_request: | |
| workflow_dispatch: | |
| env: | |
| # Some Azure runners carry a MANA NIC whose InfiniBand verbs device UCX | |
| # advertises but cannot open: uct_iface_open(ud_verbs/mana_0) fails inside | |
| # MPI_Init, so `import underworld3` dies before any UW3 code runs (issues | |
| # #461/#528 — four hits in the first week of 2026-08, each costing a manual | |
| # re-roll). A single-node CI runner needs only shared memory and TCP, so pin | |
| # the UCX transports and retire the whole flake class. | |
| UCX_TLS: tcp,sm,self | |
| # Distribute the serial batches across worker processes. This was held back | |
| # until #567 was fixed: worker counts change which files share a process, and | |
| # a units test that switched the units system on at import time then reached | |
| # a module-scoped fixture in the point-locator suite before anything reset it. | |
| # That is fixed at source in tests/conftest.py, and the whole suite is green | |
| # at 4, 8 and 16 workers. | |
| # | |
| # 4 is the vCPU count of the runner. Do NOT try to detect it: the first | |
| # attempt derived the count inside the job, got 1, and ran xdist with a single | |
| # worker — a spawn and a fresh underworld3 import per batch, parallelising | |
| # nothing, for 52m37s. The MPI batches are unaffected either way; they run | |
| # their own mpirun. | |
| WORKERS: 4 | |
| jobs: | |
| test: | |
| runs-on: ubuntu-latest | |
| # The suite has outgrown 60 minutes. Measured 2026-08-15: the SERIAL phase | |
| # alone is ~55 min (three batches at 14-15 min each), so the parallel phase | |
| # - which runs last - was being cut off mid-run and reported as a failure | |
| # that looked like a test failure. Any addition at all pushed a run over. | |
| # This is a stop-gap that unblocks landing work; the durable fix is to split | |
| # the batches across parallel jobs so wall-clock stops tracking total test | |
| # time. See the CI-runtime issue for that. | |
| timeout-minutes: 120 | |
| steps: | |
| - uses: actions/checkout@v4 | |
| - name: Install pixi from lockfile | |
| uses: prefix-dev/setup-pixi@v0.9.4 | |
| with: | |
| # Use the env that matches local development for tests. | |
| # `dev` = conda-petsc + runtime + dev features (pytest, jupyter, etc.) | |
| environments: dev | |
| # Hard-fail if pixi.lock disagrees with pixi.toml — never re-solve | |
| # silently in CI; that's exactly the failure mode we're escaping. | |
| frozen: true | |
| cache: true | |
| - name: Build UW3 | |
| # `pixi run -e dev build` invokes the build task from pixi.toml, | |
| # which is `pip install . --no-build-isolation` (non-editable — | |
| # editable installs are project policy violation, see CLAUDE.md). | |
| run: pixi run -e dev build | |
| # Import smoke test: a hard crash during `import underworld3` (segfault | |
| # / abort in a compiled module, e.g. from a poisoned env cache) kills | |
| # pytest BEFORE its first stdout flush, so every batch below fails with | |
| # zero output and the run is undiagnosable from the log (this happened | |
| # on PR #394 — a runner-side flake that cost a full debug round-trip). | |
| # This 5-second step makes any import-time crash loud and localised: | |
| # faulthandler prints the native traceback here rather than nothing | |
| # there. | |
| - name: Import smoke test (faulthandler) | |
| run: pixi run -e dev python -u -X faulthandler -c "import faulthandler; faulthandler.enable(); import underworld3; print('import OK', underworld3.__version__)" | |
| - name: Run tests | |
| run: pixi run -e dev ./scripts/test.sh --p 2 |