239 lines
13 KiB
Python
239 lines
13 KiB
Python
"""Bounded FP32 GPU / pinned FP64 CPUREF-0.3 equivalence, not accuracy validation.
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Run explicitly in pycuda_3_10 with PYTHONPATH=<this repo>/src, one BLAS thread,
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and CUDA_VISIBLE_DEVICES=0 (or 1) only after checking the physical GPU is idle.
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At most eight coarse steps per case. No files, plots or flow arrays are saved.
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"""
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import hashlib
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import importlib.util
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from contextlib import nullcontext
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from dataclasses import replace
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from pathlib import Path
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import resource
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import sys
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from threading import RLock
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import unittest
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from unittest.mock import Mock, patch
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import numpy as np
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import pycuda.driver as cuda
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import CelerisLab
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from CelerisLab.config import LBMConfig
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from CelerisLab.cuda import compiler
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from CelerisLab.cuda.context import CudaContext
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from CelerisLab.lbm.refinement_stepper import FixedPatchStepper
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ROOT = Path(__file__).resolve().parents[3]
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POP_ATOL = 3e-6
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MOMENT_ATOL = 2e-4
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REFERENCE_SHA = "bba2a06a9f6517b32079ffff15e4060d8c3b7ed35f16ca134e1877226c9e4e1e"
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REF_PATH = Path(__file__).with_name("cpu_reference.py")
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assert hashlib.sha256(REF_PATH.read_bytes()).hexdigest() == REFERENCE_SHA
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loader = importlib.util.spec_from_file_location("pinned_patch_reference", REF_PATH)
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ref = importlib.util.module_from_spec(loader)
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sys.modules[loader.name] = ref
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loader.loader.exec_module(ref)
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def postcollision(state, spec, maps):
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# Observation conversion only. Never applied to production G.
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return tuple(ref._collide(spec, a, np.isfinite(a), tau, mask,
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np.zeros(mask.shape, dtype=np.int64))
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for a, tau, mask in ((state.coarse_f, spec.tau_coarse, maps.coarse_active),
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(state.fine_f, spec.tau_fine, maps.fine_active)))
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def totals(arrays, maps):
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# Leaf sum independent of the reference's flux/budget bookkeeping helpers.
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c, f = arrays
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populations = c[:, maps.coarse_active].astype(np.float64).sum(axis=1)
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populations += .25 * f[:, maps.fine_active].astype(np.float64).sum(axis=1)
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return np.array([populations.sum(), populations @ ref.CX, populations @ ref.CY])
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def level_storage(level):
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"""Raw device storage of one blocked level as dense (9, ny, nx)."""
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blocked = np.empty(level.layout.blocked_shape, np.float32)
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cuda.memcpy_dtoh(blocked, level.current)
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return level.layout.to_dense(blocked)
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class CoupledGPU(unittest.TestCase):
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def test_actual_tg_rates_one_interval(self):
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"""Algebraic rate/phase check, not a new physical Taylor--Green benchmark.
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The N64/Re100 TG rates are exercised on the existing small patch with
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a nonequilibrium state. One interval checks g=C(f), including the
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shifted blocked path; no accuracy gate or production source changes.
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"""
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self.assertEqual(Path(CelerisLab.__file__).resolve(), ROOT / "src/CelerisLab/__init__.py")
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self.assertEqual(Path(compiler._KERNEL_DIR).resolve(), ROOT / "src/CelerisLab/lbm/kernels")
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spec = replace(ref.make_spec(collision="srt"),
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tau_coarse=.5576, tau_fine=.6152)
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maps = ref.build_maps(spec)
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state = ref.make_state(spec, velocity=(.03, -.02))
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rng = np.random.default_rng(1)
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state = ref.State(*(a * (1 + 1e-3 * rng.standard_normal(a.shape))
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for a in (state.coarse_f, state.fine_f)))
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initial = postcollision(state, spec, maps)
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next_state, _ = ref.advance_coarse_once(spec, maps, state)
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expected = postcollision(next_state, spec, maps)
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arrivals = (next_state.coarse_f, next_state.fine_f)
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cases = (("blocked_unshifted", False, dict(level_blocks=[(16, 16), (24, 24)])),
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("blocked_shifted", True,
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dict(level_blocks=[(4, 4), (6, 6)])))
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with CudaContext(0) as context:
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for label, shifted, storage in cases:
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with self.subTest(storage=label):
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cfg = LBMConfig(nx=16, ny=16, viscosity=.0192,
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ddf_shifting=shifted)
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with FixedPatchStepper(cfg, context=context, refinements=[(4, 4, 12, 12)],
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**storage) as backend:
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self.assertAlmostEqual(backend.hierarchy.pairs[0].tau_coarse, spec.tau_coarse)
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self.assertAlmostEqual(backend.hierarchy.pairs[0].tau_fine, spec.tau_fine)
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self.assertEqual(tuple(level.shape for level in backend._levels),
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((9, 16, 16), (9, 24, 24)))
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# Physical FP64 g is encoded by initialize before FP32 rounding.
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backend.initialize(*initial)
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before = totals(backend.download(), maps)
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backend.step(1)
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actual = backend.download()
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self.assertEqual(backend.step_count, 1)
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backend.hierarchy.pairs[0].check_synchronization(
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1, next_state.tick, phase="postcollision_g")
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for got, want, arrival in zip(actual, expected, arrivals):
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np.testing.assert_array_equal(np.isnan(got), np.isnan(want))
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np.testing.assert_allclose(got, want, rtol=0, atol=POP_ATOL,
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equal_nan=True)
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# A raw arrival-f comparison must fail on BOTH levels.
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# Equilibrium-only data would make this control vacuous.
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with self.assertRaises(AssertionError):
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np.testing.assert_allclose(got, arrival, rtol=0,
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atol=POP_ATOL, equal_nan=True)
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np.testing.assert_allclose(totals(actual, maps), before,
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rtol=0, atol=MOMENT_ATOL)
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np.testing.assert_allclose(totals(actual, maps),
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totals(expected, maps),
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rtol=0, atol=MOMENT_ATOL)
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error = max(float(np.nanmax(np.abs(a - e)))
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for a, e in zip(actual, expected))
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print(f"actual-TG-rate algebraic check: {label} steps=1 "
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f"tau=.5576/.6152 max_population={error:.9g}; "
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"wrong-phase controls PASS", flush=True)
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def test_cleanup_attempts_every_allocation(self):
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backend = FixedPatchStepper.__new__(FixedPatchStepper)
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backend.ctx = Mock(activate=nullcontext)
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backend._lock = RLock()
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backend._status = "failed"
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backend._stream = Mock()
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backend._stream.synchronize.side_effect = RuntimeError("original stream failure")
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first, second = Mock(), Mock()
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first.free.side_effect = RuntimeError("secondary free failure")
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backend._allocations = [first, second]
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backend._levels = [Mock()]
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with self.assertRaisesRegex(RuntimeError, "original stream failure"):
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backend.close()
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first.free.assert_called_once()
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second.free.assert_called_once()
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self.assertEqual(backend._allocations, [])
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self.assertEqual(backend._levels, [])
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backend.close()
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def test_partial_advance_cannot_be_published(self):
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spec = ref.make_spec(collision="srt")
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maps = ref.build_maps(spec)
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with CudaContext(0) as context:
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with FixedPatchStepper(LBMConfig(nx=16, ny=16, viscosity=.1),
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context=context, refinements=[(4, 4, 12, 12)],
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level_blocks=[(16, 16), (24, 24)]) as backend:
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backend.initialize(*postcollision(ref.make_state(spec), spec, maps))
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coarse, fine = backend._levels
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def fail_after_fine(*args, **kwargs):
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# Ensure both queued fine hops actually completed before failing.
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backend._stream.synchronize()
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raise RuntimeError("coarse launch failed after two fine hops")
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with patch.object(coarse, "kernel", side_effect=fail_after_fine):
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with self.assertRaisesRegex(RuntimeError, "after two fine hops"):
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backend.step()
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self.assertEqual(backend.step_count, 0)
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for operation in (backend.download, backend.step):
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with self.assertRaisesRegex(RuntimeError, "failed"):
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operation()
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raw = level_storage(fine)
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self.assertTrue(np.isfinite(raw.ravel()[backend.hierarchy.pairs[0].coalesce_fine]).all())
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self.assertFalse(context.is_closed)
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print("partial failure: two fine hops completed, no coarse step published; cleanup PASS", flush=True)
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def eight_steps(self, backend, spec, maps):
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"""Rest and seeded nonequilibrium, 8 steps against the scalar reference."""
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p = backend.hierarchy.pairs[0]
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for case in ("rest", "nonequilibrium_seed1"):
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with self.subTest(case=case):
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state = ref.make_state(spec, velocity=(0, 0) if case == "rest" else (.03, -.02))
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if case != "rest":
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rng = np.random.default_rng(1)
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state = ref.State(*(a * (1 + 1e-3 * rng.standard_normal(a.shape))
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for a in (state.coarse_f, state.fine_f)))
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initial = postcollision(state, spec, maps)
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backend.initialize(*initial)
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before = totals(backend.download(), maps)
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max_error = max_drift = max_moment_error = max_corner = 0.0
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for step in range(1, 9):
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state, diagnostic = ref.advance_coarse_once(spec, maps, state)
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backend.step()
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actual = backend.download()
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expected = postcollision(state, spec, maps)
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self.assertEqual(backend.step_count, step)
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p.check_synchronization(step, state.tick, phase="postcollision_g")
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for got, want in zip(actual, expected):
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np.testing.assert_array_equal(np.isnan(got), np.isnan(want))
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error = float(np.nanmax(np.abs(got - want)))
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self.assertLessEqual(error, POP_ATOL)
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max_error = max(max_error, error)
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drift = float(np.max(np.abs(totals(actual, maps) - before)))
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moment_error = float(np.max(np.abs(totals(actual, maps) - totals(expected, maps))))
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self.assertLessEqual(drift, MOMENT_ATOL)
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self.assertLessEqual(moment_error, MOMENT_ATOL)
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max_drift, max_moment_error = max(max_drift, drift), max(max_moment_error, moment_error)
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f = backend._levels[1]
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raw = level_storage(f)
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np.testing.assert_array_equal(np.isfinite(raw), diagnostic["hop2_valid"])
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self.assertTrue(np.isfinite(raw.ravel()[p.coalesce_fine]).all())
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self.assertEqual(len(diagnostic["corner_packets"]), 8)
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for packet in diagnostic["corner_packets"].values():
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sx, sy = packet["source_coarse_xy"]
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self.assertTrue(maps.coarse_active[sy, sx])
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values = [raw[packet["direction"], y, x]
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for y, x in packet["children_fine_yx"]]
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error = float(np.max(np.abs(np.array(values) - packet["packets"])))
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self.assertLessEqual(error, POP_ATOL)
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max_corner = max(max_corner, error)
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print(f"{case}: steps=8 max_population={max_error:.9g} "
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f"max_leaf_drift={max_drift:.9g} max_leaf_error={max_moment_error:.9g} "
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f"max_corner_packet={max_corner:.9g}; PASS", flush=True)
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def test_bounded_equivalence_blocked(self):
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"""The same eight-step reference and launch-failure checks on whole-level tiles."""
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spec = ref.make_spec(collision="srt")
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maps = ref.build_maps(spec)
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cfg = LBMConfig(nx=16, ny=16, viscosity=.1)
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with CudaContext(0) as context:
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with FixedPatchStepper(cfg, context=context, refinements=[(4, 4, 12, 12)],
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level_blocks=[(16, 16), (24, 24)]) as backend:
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self.eight_steps(backend, spec, maps)
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with patch.object(backend._pairs[0], "explode", side_effect=RuntimeError("injected launch failure")):
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with self.assertRaisesRegex(RuntimeError, "injected"):
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backend.step()
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for operation in (backend.download, backend.step):
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with self.assertRaisesRegex(RuntimeError, "failed"):
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operation()
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self.assertFalse(context.is_closed)
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if __name__ == "__main__":
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unittest.main(verbosity=2)
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