experiment: try to standardize test environment

src/heretic/main.py

@@ -268,6 +268,10 @@ def run():
 
     print(get_accelerator_info())
 
+    torch.backends.mkldnn.enabled = False  # ty:ignore[invalid-assignment]
+    torch.set_num_threads(1)
+    torch.set_num_interop_threads(1)
+
     if settings.print_debug_information:
         print()
         print(torch.__config__.show().strip())

tests/run_tests.py

@@ -2,6 +2,7 @@
 # Copyright (C) 2025-2026  Philipp Emanuel Weidmann <pew@worldwidemann.com> + contributors
 
 import hashlib
+import os
 import subprocess
 import sys
 from pathlib import Path
@@ -23,6 +24,12 @@ script_directory = Path(__file__).resolve().parent
 
 project_directory = script_directory.parent
 
+environment = os.environ | {
+    "OMP_NUM_THREADS": "1",
+    "MKL_NUM_THREADS": "1",
+    "OPENBLAS_NUM_THREADS": "1",
+}
+
 for test_directory in script_directory.iterdir():
     if test_directory.is_dir():
         config_file = test_directory / "config.toml"
@@ -44,6 +51,7 @@ for test_directory in script_directory.iterdir():
                     test_directory,
                     "heretic",
                 ],
+                env=environment,
                 check=True,
             )