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89 lines
3.0 KiB
Python
89 lines
3.0 KiB
Python
# Copyright 2025 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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import subprocess
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import sys
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import threading
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import unittest
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from absl.testing import absltest, parameterized
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import jax
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from jax._src import distributed
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from jax._src import test_util as jtu
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try:
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import portpicker
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except ImportError:
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portpicker = None
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jax.config.parse_flags_with_absl()
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@unittest.skipIf(not portpicker, "Test requires portpicker")
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class DistributedTest(jtu.JaxTestCase):
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# TODO(phawkins): Enable after https://github.com/jax-ml/jax/issues/11222
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# is fixed.
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@unittest.SkipTest
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def testInitializeAndShutdown(self):
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if not jtu.test_device_matches(["gpu"]):
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self.skipTest("Test only works with GPUs.")
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# Tests the public APIs. Since they use global state, we cannot use
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# concurrency to simulate multiple tasks.
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port = portpicker.pick_unused_port()
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jax.distributed.initialize(
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coordinator_address=f"localhost:{port}", num_processes=1, process_id=0
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)
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jax.distributed.shutdown()
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@parameterized.parameters([1, 2, 4])
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def testConcurrentInitializeAndShutdown(self, n):
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if not jtu.test_device_matches(["gpu"]):
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self.skipTest("Test only works with GPUs.")
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port = portpicker.pick_unused_port()
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def task(i):
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# We can't call the public APIs directly because they use global state.
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state = distributed.State()
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state.initialize(
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coordinator_address=f"localhost:{port}", num_processes=n, process_id=i
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)
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state.shutdown()
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threads = [threading.Thread(target=task, args=(i,)) for i in range(n)]
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for thread in threads:
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thread.start()
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for thread in threads:
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thread.join()
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def test_is_distributed_initialized(self):
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# Run in subprocess to isolate side effects from jax.distributed.initialize which conflict with other
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# tests. Unfortunately this can't be avoided by calling jax.distributed.shutdown, as the XLA backend
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# will be warmed up, which yields a RuntimeError on subsequent calls to initialize.
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port = portpicker.pick_unused_port() # type: ignore
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cmd = f"""import jax;
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assert not jax.distributed.is_initialized();
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jax.distributed.initialize('localhost:{port}', 1, 0);
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assert jax.distributed.is_initialized();
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""".replace("\n", ' ')
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result = subprocess.run([sys.executable, "-c", cmd], capture_output=True)
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self.assertEqual(
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result.returncode, 0, msg=f"Test failed with:\n{result.stdout}\n{result.stderr}"
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)
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if __name__ == "__main__":
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absltest.main(testLoader=jtu.JaxTestLoader())
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