run test_torchinductor without parallelism

Author: h-vetinari

recipe/meta.yaml

@@ -428,9 +428,6 @@ outputs:
             "test/test_torch.py",
             "test/test_xnnpack_integration.py",
         ]) %}
-        # tests torch.compile; avoid on aarch because it adds >4h in test runtime in emulation;
-        # they add a lot of runtime (15->60min on windows), so run them for only one python version
-        {% set tests = tests ~ " test/inductor/test_torchinductor.py" %}    # [py==312 and not aarch64]
 
         {% set skips = "(TestTorch and test_print)" %}
         # minor tolerance violations
@@ -487,6 +484,11 @@ outputs:
         # disable hypothesis because it randomly yields health check errors
         - python -m pytest -n 2 -v {{ tests }} -k "not ({{ skips }})" -m "not hypothesis" --durations=50   # [unix and (not aarch64 or py==312)]
         - python -m pytest -v -s {{ tests }} -k "not ({{ skips }})" -m "not hypothesis" --durations=50  # [win]
+        # tests torch.compile; avoid on aarch because it adds >4h in test runtime in emulation;
+        # they add a lot of runtime (15->60min on windows), so run them for only one python version;
+        # turn off parallelism because some tests themselves require openmp
+        - export OMP_NUM_THREADS=1  # [unix]
+        - pytest -n 1 -v test/inductor/test_torchinductor.py    # [py==312 and not aarch64]
 
         # regression test for https://github.com/conda-forge/pytorch-cpu-feedstock/issues/329, where we picked up
         # duplicate `.pyc` files due to newest py-ver (3.13) in the build environment not matching the one in host;