ClaudeandClaude Opus 5.5
1cbdc479cf
The module-level import of CelerisLab.lbm.block_stepper loaded pycuda.driver into the shared test process, unlike the other CPU host tests (which load mocked copies via AST). find_spec gives the source path without the import. Test content and assertions unchanged. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
105 lines
4.2 KiB
Python
105 lines
4.2 KiB
Python
"""Host contract of PeriodicBlockStepper.step(n): one stream wait per call (mocked driver)."""
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import ast
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from contextlib import nullcontext
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import importlib.util
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from pathlib import Path
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import types
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from unittest.mock import Mock
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import unittest
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import numpy as np
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from CelerisLab.config import LBMConfig
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from CelerisLab.lbm.blocks import BlockLayout2D
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def host_module():
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"""block_stepper with pycuda/compiler replaced by mocks; no GPU context."""
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# Locate the source without importing it: importing block_stepper loads pycuda.driver,
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# which CPU-only import-boundary tests (test_build_contracts) must never see.
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path = Path(importlib.util.find_spec("CelerisLab.lbm.block_stepper").origin)
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tree = ast.parse(path.read_text())
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tree.body = [node for node in tree.body if not (
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isinstance(node, ast.Import) and any(a.name == "pycuda.driver" for a in node.names)
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or isinstance(node, ast.ImportFrom) and node.module == "cuda")]
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module = types.ModuleType("CelerisLab.lbm._test_host_block_stepper")
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module.__package__ = "CelerisLab.lbm"
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module.__dict__.update(cuda=Mock(), compiler=Mock())
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exec(compile(tree, str(path), "exec"), module.__dict__)
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return module
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def backend():
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host, log = host_module(), []
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host.cuda.mem_get_info.return_value = (1 << 40, 1 << 40)
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host.cuda.mem_alloc.side_effect = lambda size: Mock(size=size) # distinct buffers
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module = Mock()
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module.get_global.return_value = (Mock(), 20)
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module.get_function.side_effect = lambda name: Mock(
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side_effect=lambda *a, **k: log.append((name, a[:2])))
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host.compiler.load_module.return_value = module
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cfg = LBMConfig(nx=16, ny=16, viscosity=.1)
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run = host.PeriodicBlockStepper(cfg, BlockLayout2D.build(16, 16, 8, 8),
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context=Mock(activate=nullcontext, sm_arch="sm_70"))
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run._stream.synchronize.side_effect = lambda: log.append(("sync", ()))
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run.initialize(np.full((9, 16, 16), 1 / 9))
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log.clear()
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return run, log
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class BlockStepSync(unittest.TestCase):
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def test_step_n_waits_once_and_matches_n_single_steps(self):
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many, log_many = backend()
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many.step(3)
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single, log_single = backend()
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for _ in range(3):
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single.step(1)
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names = [name for name, _ in log_many]
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self.assertEqual(names.count("sync"), 1)
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self.assertEqual(names[-1], "sync")
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self.assertEqual(names.count("BlockStep"), 3)
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# Same launch order and buffer roles as three step(1) calls.
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strip = lambda log: [(n, tuple(id(x) for x in a)) for n, a in log if n != "sync"]
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roles = lambda run, log: [(n, tuple({id(run._current): "c", id(run._spare): "s"}.get(x, "-")
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for x in ids)) for n, ids in strip(log)]
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self.assertEqual([n for n, _ in strip(log_many)], [n for n, _ in strip(log_single)])
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self.assertEqual(roles(many, log_many), roles(single, log_single))
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self.assertIsNot(many._current, many._spare)
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self.assertEqual((many.step_count, single.step_count), (3, 3))
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def test_step_zero_launches_and_waits_for_nothing(self):
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run, log = backend()
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run.step(0)
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self.assertEqual((log, run.step_count), ([], 0))
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def test_failure_keeps_entry_step_count(self):
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run, log = backend()
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run.step(1)
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run._stream.synchronize.side_effect = RuntimeError("device fault")
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with self.assertRaises(RuntimeError):
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run.step(2)
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self.assertEqual((run.step_count, run._status), (1, "failed"))
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def test_launch_failure_mid_batch_fails_closed_without_waiting(self):
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run, log = backend()
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calls = []
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step = run._step
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def failing(*args, **kwargs):
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calls.append(1)
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if len(calls) == 2:
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raise RuntimeError("launch failure")
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return step(*args, **kwargs)
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run._step = failing
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with self.assertRaises(RuntimeError):
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run.step(3)
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self.assertNotIn("sync", [name for name, _ in log])
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self.assertEqual((run.step_count, run._status), (0, "failed"))
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with self.assertRaises(RuntimeError):
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run.download()
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if __name__ == "__main__":
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unittest.main()
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