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@starkphi starkphi commented Sep 29, 2025

This pull request aims to allow the dycore to run in single precision.

Inherited from the Fortran ICON there are the types wpfloat and vpfloat. In the original this can be used to run in mixed precision, but in icon4py this does not work yet. Setting both to single precision resulted in various problems which this pull request aims to fix.

Note: #970 serves as an intermediate step for this PR.

Changes

  • Add the option to set single precision by setting the environment variable FLOAT_PRECISION (like was already implemented for mixed precision)
  • Replace standard python float types by wp-/vpfloat (standard floats are interpreted as doubles by gt4py)
    • also specify types of numeric literals
  • Add casting to ensure correct types in classes to be compatible with the typing in field_operators (e.g. in class NonHydrostaticConfig)
  • Ensure all constants and small epsilon values use wp/vpfloats (e.g. WP_EPS and VP_EPS instead of just DBL_EPS)

TODO

  • Switch back to gtx.sqrt in diffusion.py once GT4Py issue #2277 is closed -> was replaced by math.sqrt in main already now
  • minimal testing: add a single precision test version for at least test_velocity_advection.py::test_compute_advection_in_vertical_momentum_equation and ..in_vertical..
  • Find and solve bug that appears when running with the compiled self._calculate_divdamp_fields (introduced in Make calculate_divdamp_fields a compiled program #888) in combination with single precision.
  • Make at least some dycore stencil tests single precision ready
  • Write blue line wrappers
    • pass pytests
    • edit and pass Fortran tests

DropD and others added 30 commits September 4, 2025 14:42
Fix bug in the input arguments of
`IconSerialDataProvider.from_grid_savepoint` in
`initialization_utils.py` of the driver package after this PR
#829 is merged.
On the mch-ch1_medium experiment
- this is 4% faster on the full timestep compared to the version without
`ravel`;
- within fluctuations there is no difference between no reduction and
this version.
delete top level README.md from tools
Bumps [actions/setup-python](https://github.com/actions/setup-python)
from 5 to 6.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a
href="https://github.com/actions/setup-python/releases">actions/setup-python's
releases</a>.</em></p>
<blockquote>
<h2>v6.0.0</h2>
<h2>What's Changed</h2>
<h3>Breaking Changes</h3>
<ul>
<li>Upgrade to node 24 by <a
href="https://github.com/salmanmkc"><code>@​salmanmkc</code></a> in <a
href="https://redirect.github.com/actions/setup-python/pull/1164">actions/setup-python#1164</a></li>
</ul>
<p>Make sure your runner is on version v2.327.1 or later to ensure
compatibility with this release. <a
href="https://github.com/actions/runner/releases/tag/v2.327.1">See
Release Notes</a></p>
<h3>Enhancements:</h3>
<ul>
<li>Add support for <code>pip-version</code> by <a
href="https://github.com/priyagupta108"><code>@​priyagupta108</code></a>
in <a
href="https://redirect.github.com/actions/setup-python/pull/1129">actions/setup-python#1129</a></li>
<li>Enhance reading from .python-version by <a
href="https://github.com/krystof-k"><code>@​krystof-k</code></a> in <a
href="https://redirect.github.com/actions/setup-python/pull/787">actions/setup-python#787</a></li>
<li>Add version parsing from Pipfile by <a
href="https://github.com/aradkdj"><code>@​aradkdj</code></a> in <a
href="https://redirect.github.com/actions/setup-python/pull/1067">actions/setup-python#1067</a></li>
</ul>
<h3>Bug fixes:</h3>
<ul>
<li>Clarify pythonLocation behaviour for PyPy and GraalPy in environment
variables by <a
href="https://github.com/aparnajyothi-y"><code>@​aparnajyothi-y</code></a>
in <a
href="https://redirect.github.com/actions/setup-python/pull/1183">actions/setup-python#1183</a></li>
<li>Change missing cache directory error to warning by <a
href="https://github.com/aparnajyothi-y"><code>@​aparnajyothi-y</code></a>
in <a
href="https://redirect.github.com/actions/setup-python/pull/1182">actions/setup-python#1182</a></li>
<li>Add Architecture-Specific PATH Management for Python with --user
Flag on Windows by <a
href="https://github.com/aparnajyothi-y"><code>@​aparnajyothi-y</code></a>
in <a
href="https://redirect.github.com/actions/setup-python/pull/1122">actions/setup-python#1122</a></li>
<li>Include python version in PyPy python-version output by <a
href="https://github.com/cdce8p"><code>@​cdce8p</code></a> in <a
href="https://redirect.github.com/actions/setup-python/pull/1110">actions/setup-python#1110</a></li>
<li>Update docs: clarification on pip authentication with setup-python
by <a
href="https://github.com/priya-kinthali"><code>@​priya-kinthali</code></a>
in <a
href="https://redirect.github.com/actions/setup-python/pull/1156">actions/setup-python#1156</a></li>
</ul>
<h3>Dependency updates:</h3>
<ul>
<li>Upgrade idna from 2.9 to 3.7 in /<strong>tests</strong>/data by <a
href="https://github.com/dependabot"><code>@​dependabot</code></a>[bot]
in <a
href="https://redirect.github.com/actions/setup-python/pull/843">actions/setup-python#843</a></li>
<li>Upgrade form-data to fix critical vulnerabilities <a
href="https://redirect.github.com/actions/setup-python/issues/182">#182</a>
&amp; <a
href="https://redirect.github.com/actions/setup-python/issues/183">#183</a>
by <a
href="https://github.com/aparnajyothi-y"><code>@​aparnajyothi-y</code></a>
in <a
href="https://redirect.github.com/actions/setup-python/pull/1163">actions/setup-python#1163</a></li>
<li>Upgrade setuptools to 78.1.1 to fix path traversal vulnerability in
PackageIndex.download by <a
href="https://github.com/aparnajyothi-y"><code>@​aparnajyothi-y</code></a>
in <a
href="https://redirect.github.com/actions/setup-python/pull/1165">actions/setup-python#1165</a></li>
<li>Upgrade actions/checkout from 4 to 5 by <a
href="https://github.com/dependabot"><code>@​dependabot</code></a>[bot]
in <a
href="https://redirect.github.com/actions/setup-python/pull/1181">actions/setup-python#1181</a></li>
<li>Upgrade <code>@​actions/tool-cache</code> from 2.0.1 to 2.0.2 by <a
href="https://github.com/dependabot"><code>@​dependabot</code></a>[bot]
in <a
href="https://redirect.github.com/actions/setup-python/pull/1095">actions/setup-python#1095</a></li>
</ul>
<h2>New Contributors</h2>
<ul>
<li><a href="https://github.com/krystof-k"><code>@​krystof-k</code></a>
made their first contribution in <a
href="https://redirect.github.com/actions/setup-python/pull/787">actions/setup-python#787</a></li>
<li><a href="https://github.com/cdce8p"><code>@​cdce8p</code></a> made
their first contribution in <a
href="https://redirect.github.com/actions/setup-python/pull/1110">actions/setup-python#1110</a></li>
<li><a href="https://github.com/aradkdj"><code>@​aradkdj</code></a> made
their first contribution in <a
href="https://redirect.github.com/actions/setup-python/pull/1067">actions/setup-python#1067</a></li>
</ul>
<p><strong>Full Changelog</strong>: <a
href="https://github.com/actions/setup-python/compare/v5...v6.0.0">https://github.com/actions/setup-python/compare/v5...v6.0.0</a></p>
<h2>v5.6.0</h2>
<h2>What's Changed</h2>
<ul>
<li>Workflow updates related to Ubuntu 20.04 by <a
href="https://github.com/aparnajyothi-y"><code>@​aparnajyothi-y</code></a>
in <a
href="https://redirect.github.com/actions/setup-python/pull/1065">actions/setup-python#1065</a></li>
<li>Fix for Candidate Not Iterable Error by <a
href="https://github.com/aparnajyothi-y"><code>@​aparnajyothi-y</code></a>
in <a
href="https://redirect.github.com/actions/setup-python/pull/1082">actions/setup-python#1082</a></li>
<li>Upgrade semver and <code>@​types/semver</code> by <a
href="https://github.com/dependabot"><code>@​dependabot</code></a> in <a
href="https://redirect.github.com/actions/setup-python/pull/1091">actions/setup-python#1091</a></li>
<li>Upgrade prettier from 2.8.8 to 3.5.3 by <a
href="https://github.com/dependabot"><code>@​dependabot</code></a> in <a
href="https://redirect.github.com/actions/setup-python/pull/1046">actions/setup-python#1046</a></li>
<li>Upgrade ts-jest from 29.1.2 to 29.3.2 by <a
href="https://github.com/dependabot"><code>@​dependabot</code></a> in <a
href="https://redirect.github.com/actions/setup-python/pull/1081">actions/setup-python#1081</a></li>
</ul>
<p><strong>Full Changelog</strong>: <a
href="https://github.com/actions/setup-python/compare/v5...v5.6.0">https://github.com/actions/setup-python/compare/v5...v5.6.0</a></p>
<h2>v5.5.0</h2>
<h2>What's Changed</h2>
<h3>Enhancements:</h3>
<ul>
<li>Support free threaded Python versions like '3.13t' by <a
href="https://github.com/colesbury"><code>@​colesbury</code></a> in <a
href="https://redirect.github.com/actions/setup-python/pull/973">actions/setup-python#973</a></li>
<li>Enhance Workflows: Include ubuntu-arm runners, Add e2e Testing for
free threaded and Upgrade <code>@​action/cache</code> from 4.0.0 to
4.0.3 by <a
href="https://github.com/priya-kinthali"><code>@​priya-kinthali</code></a>
in <a
href="https://redirect.github.com/actions/setup-python/pull/1056">actions/setup-python#1056</a></li>
<li>Add support for .tool-versions file in setup-python by <a
href="https://github.com/mahabaleshwars"><code>@​mahabaleshwars</code></a>
in <a
href="https://redirect.github.com/actions/setup-python/pull/1043">actions/setup-python#1043</a></li>
</ul>
<h3>Bug fixes:</h3>
<ul>
<li>Fix architecture for pypy on Linux ARM64 by <a
href="https://github.com/mayeut"><code>@​mayeut</code></a> in <a
href="https://redirect.github.com/actions/setup-python/pull/1011">actions/setup-python#1011</a>
This update maps arm64 to aarch64 for Linux ARM64 PyPy
installations.</li>
</ul>
<!-- raw HTML omitted -->
</blockquote>
<p>... (truncated)</p>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/actions/setup-python/commit/e797f83bcb11b83ae66e0230d6156d7c80228e7c"><code>e797f83</code></a>
Upgrade to node 24 (<a
href="https://redirect.github.com/actions/setup-python/issues/1164">#1164</a>)</li>
<li><a
href="https://github.com/actions/setup-python/commit/3d1e2d2ca0a067f27da6fec484fce7f5256def85"><code>3d1e2d2</code></a>
Revert &quot;Enhance cache-dependency-path handling to support files
outside the w...</li>
<li><a
href="https://github.com/actions/setup-python/commit/65b071217a8539818fdb8b54561bcbae40380a54"><code>65b0712</code></a>
Clarify pythonLocation behavior for PyPy and GraalPy in environment
variables...</li>
<li><a
href="https://github.com/actions/setup-python/commit/5b668cf7652160527499ee14ceaff4be9306cb88"><code>5b668cf</code></a>
Bump actions/checkout from 4 to 5 (<a
href="https://redirect.github.com/actions/setup-python/issues/1181">#1181</a>)</li>
<li><a
href="https://github.com/actions/setup-python/commit/f62a0e252fe7114e86949abfa6e1e89f85bb38c2"><code>f62a0e2</code></a>
Change missing cache directory error to warning (<a
href="https://redirect.github.com/actions/setup-python/issues/1182">#1182</a>)</li>
<li><a
href="https://github.com/actions/setup-python/commit/9322b3ca74000aeb2c01eb777b646334015ddd72"><code>9322b3c</code></a>
Upgrade setuptools to 78.1.1 to fix path traversal vulnerability in
PackageIn...</li>
<li><a
href="https://github.com/actions/setup-python/commit/fbeb884f69f0ac1c0257302f62aa524c2824b649"><code>fbeb884</code></a>
Bump form-data to fix critical vulnerabilities <a
href="https://redirect.github.com/actions/setup-python/issues/182">#182</a>
&amp; <a
href="https://redirect.github.com/actions/setup-python/issues/183">#183</a>
(<a
href="https://redirect.github.com/actions/setup-python/issues/1163">#1163</a>)</li>
<li><a
href="https://github.com/actions/setup-python/commit/03bb6152f4f691b9d64579a1bd791904a083c452"><code>03bb615</code></a>
Bump idna from 2.9 to 3.7 in /<strong>tests</strong>/data (<a
href="https://redirect.github.com/actions/setup-python/issues/843">#843</a>)</li>
<li><a
href="https://github.com/actions/setup-python/commit/36da51d563b70a972897150555bb025096d65565"><code>36da51d</code></a>
Add version parsing from Pipfile (<a
href="https://redirect.github.com/actions/setup-python/issues/1067">#1067</a>)</li>
<li><a
href="https://github.com/actions/setup-python/commit/3c6f142cc0036d53007e92fa1e327564a4cfb7aa"><code>3c6f142</code></a>
update documentation (<a
href="https://redirect.github.com/actions/setup-python/issues/1156">#1156</a>)</li>
<li>Additional commits viewable in <a
href="https://github.com/actions/setup-python/compare/v5...v6">compare
view</a></li>
</ul>
</details>
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- Removed `vertical_mass_flux_at_cells_on_half_levels`,
`tridiagonal_alpha_coeff_at_cells_on_half_levels`,
`tridiagonal_beta_coeff_at_cells_on_model_levels`, `exner_explicit_term`
and `rho_explicit_term` from intermediate fields passed around
- Combined
`_vertically_implicit_solver_at_corrector/predictor_step_before/after_solving_w`
- Improved initialization of scans (level 0 and 80) (together with
@philip-paul-mueller )
- Removed any unnecessary initializations related to them (i.e.
`next_w`)
  - Handle related unit tests
- Make sure that the values for the `n_lev` vertical level are passed
from `_set_surface_boundary_condtion_for_computation_of_w` to
`_vertically_implicit_solver_at_corrector/predictor_step_before_solving_w`
properly
  - Improves DaCe handling of temporaries

---------

Co-authored-by: "Ong Chia Rui" <[email protected]>
Fix an issue in velocity advection tests, that caused the dace programs
to fail: a cupy array was expected as argument, a numpy array was
passed.
This PR enables CI tests on the dace backend.
- In the Github Actions, we run the stencil tests on the CPU backend.
- In the CSCS CI, we run the tests with serialized data on the GPU
backend, only for diffusion and dycore in order to save compute
resources.
iomaganaris and others added 27 commits November 6, 2025 11:13
…tion for input_data in stencil tests; uses the right dims and floating-point type based on json
@starkphi starkphi force-pushed the add_single_precision_dycore branch from 0bf7cff to bafa93b Compare November 17, 2025 13:23
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Mandatory Tests

Please make sure you run these tests via comment before you merge!

  • cscs-ci run default

Optional Tests

To run benchmarks you can use:

  • cscs-ci run benchmark-bencher

To run tests and benchmarks with the DaCe backend you can use:

  • cscs-ci run dace

To run test levels ignored by the default test suite (mostly simple datatest for static fields computations) you can use:

  • cscs-ci run extra

For more detailed information please look at CI in the EXCLAIM universe.

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10 participants