46 lines
1.8 KiB
Python
46 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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import pytorch_lightning.utilities.xla_device_utils as xla_utils
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from pytorch_lightning.utilities import _TPU_AVAILABLE, _XLA_AVAILABLE
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from tests.helpers.utils import pl_multi_process_test
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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 tpu_device_exists returns None when torch_xla is not available"""
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assert xla_utils.XLADeviceUtils.tpu_device_exists() is None
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@pytest.mark.skipif(not _TPU_AVAILABLE, reason="test requires torch_xla to be installed")
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@pl_multi_process_test
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def test_tpu_device_presence():
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"""Check tpu_device_exists returns True when TPU is available"""
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assert xla_utils.XLADeviceUtils.tpu_device_exists() is True
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@patch('pytorch_lightning.utilities.xla_device_utils.TPU_CHECK_TIMEOUT', 10)
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def test_result_returns_within_timeout_seconds():
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"""Check that pl_multi_process returns within 10 seconds"""
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start = time.time()
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result = xla_utils.pl_multi_process(time.sleep)(xla_utils.TPU_CHECK_TIMEOUT * 1.25)
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end = time.time()
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elapsed_time = int(end - start)
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assert elapsed_time <= xla_utils.TPU_CHECK_TIMEOUT
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assert result is False
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