55 lines
1.8 KiB
Python
55 lines
1.8 KiB
Python
# Copyright The PyTorch Lightning team.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import time
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from unittest.mock import patch
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import pytest
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from tests_lite.helpers.runif import RunIf
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from lightning_lite.accelerators.tpu import _multi_process, _XLA_AVAILABLE, TPUAccelerator
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@pytest.mark.skipif(_XLA_AVAILABLE, reason="test requires torch_xla to be absent")
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def test_tpu_device_absence():
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"""Check `is_available` returns True when TPU is available."""
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assert not TPUAccelerator.is_available()
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@RunIf(tpu=True)
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def test_tpu_device_presence():
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"""Check `is_available` returns True when TPU is available."""
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assert TPUAccelerator.is_available()
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def sleep_fn(sleep_time: float) -> bool:
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time.sleep(sleep_time)
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return True
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@patch("lightning_lite.accelerators.tpu.TPU_CHECK_TIMEOUT", 3)
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@pytest.mark.skipif(not _XLA_AVAILABLE, reason="test requires torch_xla to be present")
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def test_result_returns_within_timeout_seconds():
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"""Check that pl_multi_process returns within 3 seconds."""
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fn = _multi_process(sleep_fn)
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start = time.time()
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from lightning_lite.accelerators.tpu import TPU_CHECK_TIMEOUT
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result = fn(TPU_CHECK_TIMEOUT * 0.5)
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end = time.time()
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elapsed_time = int(end - start)
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assert elapsed_time <= TPU_CHECK_TIMEOUT
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assert result
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