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62 lines
2.0 KiB
Python
62 lines
2.0 KiB
Python
# Copyright 2024 The JAX Authors.
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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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# https://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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from absl.testing import absltest
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import jax
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from jax._src import test_util as jtu
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import jax.numpy as jnp
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from jax.sharding import NamedSharding
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from jax.sharding import PartitionSpec as P
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jax.config.parse_flags_with_absl()
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NUM_SLICES = 2
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NUM_HOSTS_PER_SLICE = 4
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@jtu.with_global_config(
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jax_mock_gpu_topology=f"{NUM_SLICES}x{NUM_HOSTS_PER_SLICE}x1",
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jax_cuda_visible_devices="0")
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@jtu.thread_unsafe_test_class()
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class MockGPUTopologyTest(jtu.JaxTestCase):
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def setUp(self):
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super().setUp()
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if not jtu.test_device_matches(["gpu"]):
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self.skipTest("Mocking devices only works on the GPU backend.")
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@jtu.skip_under_pytest("Test must run in an isolated process")
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def testMockDeviceCount(self):
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self.assertEqual(jax.device_count(), NUM_SLICES * NUM_HOSTS_PER_SLICE)
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@jtu.skip_under_pytest("Test must run in an isolated process")
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def testMockWithSharding(self):
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mesh = jax.sharding.Mesh(jax.devices(), ('x',))
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f = jax.jit(jnp.sum,
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in_shardings=NamedSharding(mesh, P('x')),
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out_shardings=NamedSharding(mesh, P()))
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f_lowered = f.lower(jnp.arange(16))
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hlo = f_lowered.compiler_ir()
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mocked_count = NUM_SLICES * NUM_HOSTS_PER_SLICE
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self.assertIn(f'num_partitions = {mocked_count}', str(hlo))
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self.assertIn(
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f'sharding = "{{devices=[{mocked_count}]<=[{mocked_count}]}}"',
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str(hlo)
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)
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if __name__ == '__main__':
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absltest.main(testLoader=jtu.JaxTestLoader())
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