fix and rename helper function to recognize python backends.

ci/default.yml

@@ -30,7 +30,8 @@ test_model_datatests:
     extends: .test_template
     stage: test
     script:
-        - tox -r -e run_model_tests -c model/ --verbose -- $COMPONENT
+        - tox -r -e run_model_tests -c model/ --verbose -- --backend=$BACKEND $COMPONENT
     parallel:
         matrix:
             - COMPONENT: [atmosphere/diffusion/tests/diffusion_tests, atmosphere/dycore/tests/dycore_tests, common/tests, driver/tests]
+              BACKEND: [gtfn_cpu]

model/common/src/icon4py/model/common/test_utils/helpers.py

@@ -14,7 +14,6 @@
 from dataclasses import dataclass, field
 from typing import ClassVar, Optional
 
-import gt4py.next.program_processors.modular_executor
 import numpy as np
 import numpy.typing as npt
 import pytest
@@ -37,16 +36,19 @@ def backend(request):
     return request.param
 
 
-def is_otf(backend) -> bool:
+def is_python(backend) -> bool:
     # want to exclude python backends:
     #   - cannot run on embedded: because of slicing
     #   - roundtrip is very slow on large grid
-    if hasattr(backend, "executor"):
-        if isinstance(
-            backend.executor, gt4py.next.program_processors.modular_executor.ModularExecutor
-        ):
-            return True
-    return False
+    return is_embedded(backend) or is_roundtrip(backend)
+
+
+def is_embedded(backend) -> bool:
+    return backend is None
+
+
+def is_roundtrip(backend) -> bool:
+    return backend.__name__ == "roundtrip" if backend else False
 
 
 def _shape(

model/common/tests/metric_tests/test_metric_fields.py

@@ -25,7 +25,8 @@
 from icon4py.model.common.test_utils.helpers import (
     StencilTest,
     dallclose,
-    is_otf,
+    is_python,
+    is_roundtrip,
     random_field,
     zero_field,
 )
@@ -65,7 +66,7 @@ def input_data(self, grid) -> dict:
 
 
 def test_compute_ddq_z_half(icon_grid, metrics_savepoint, backend):
-    if not is_otf(backend):
+    if is_python(backend):
         pytest.skip("skipping: unsupported backend")
     ddq_z_half_ref = metrics_savepoint.ddqz_z_half()
     z_ifc = metrics_savepoint.z_ifc()
@@ -100,8 +101,8 @@ def test_compute_ddq_z_half(icon_grid, metrics_savepoint, backend):
 
 
 def test_compute_ddqz_z_full(icon_grid, metrics_savepoint, backend):
-    if not is_otf(backend):
-        pytest.skip("skipping: unsupported backend")
+    if is_roundtrip(backend):
+        pytest.skip("skipping: slow backend")
     z_ifc = metrics_savepoint.z_ifc()
     inv_ddqz_full_ref = metrics_savepoint.inv_ddqz_z_full()
     ddqz_z_full = zero_field(icon_grid, CellDim, KDim)

model/common/tests/metric_tests/test_reference_atmosphere.py

@@ -26,7 +26,7 @@
     compute_reference_atmosphere_cell_fields,
     compute_reference_atmosphere_edge_fields,
 )
-from icon4py.model.common.test_utils.helpers import dallclose, is_otf, zero_field
+from icon4py.model.common.test_utils.helpers import dallclose, is_roundtrip, zero_field
 from icon4py.model.common.type_alias import wpfloat
 
 
@@ -38,6 +38,8 @@
 def test_compute_reference_atmosphere_fields_on_full_level_masspoints(
     icon_grid, metrics_savepoint, backend
 ):
+    if is_roundtrip(backend):
+        pytest.skip("skipping: slow backend")
     exner_ref_mc_ref = metrics_savepoint.exner_ref_mc()
     rho_ref_mc_ref = metrics_savepoint.rho_ref_mc()
     theta_ref_mc_ref = metrics_savepoint.theta_ref_mc()
@@ -89,6 +91,8 @@ def test_compute_reference_atmosphere_fields_on_full_level_masspoints(
 def test_compute_reference_atmsophere_on_half_level_mass_points(
     icon_grid, metrics_savepoint, backend
 ):
+    if is_roundtrip(backend):
+        pytest.skip("skipping: slow backend")
     theta_ref_ic_ref = metrics_savepoint.theta_ref_ic()
     z_ifc = metrics_savepoint.z_ifc()
 
@@ -124,8 +128,8 @@ def test_compute_reference_atmsophere_on_half_level_mass_points(
 
 @pytest.mark.datatest
 def test_compute_d_exner_dz_ref_ic(icon_grid, metrics_savepoint, backend):
-    if not is_otf(backend):
-        pytest.skip("skipping: unsupported backend")
+    if is_roundtrip(backend):
+        pytest.skip("skipping: slow backend")
     theta_ref_ic = metrics_savepoint.theta_ref_ic()
     d_exner_dz_ref_ic_ref = metrics_savepoint.d_exner_dz_ref_ic()
     d_exner_dz_ref_ic = zero_field(icon_grid, CellDim, KDim, extend={KDim: 1})
@@ -144,8 +148,8 @@ def test_compute_d_exner_dz_ref_ic(icon_grid, metrics_savepoint, backend):
 def test_compute_reference_atmosphere_on_full_level_edge_fields(
     icon_grid, interpolation_savepoint, metrics_savepoint, backend
 ):
-    if not is_otf(backend):
-        pytest.skip("skipping: unsupported backend")
+    if is_roundtrip(backend):
+        pytest.skip("skipping: slow backend")
     rho_ref_me_ref = metrics_savepoint.rho_ref_me()
     theta_ref_me_ref = metrics_savepoint.theta_ref_me()
     rho_ref_me = metrics_savepoint.rho_ref_me()