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#!/usr/bin/env python3
# Owner(s): ["oncall: r2p"]
# Copyright (c) Facebook, Inc. and its affiliates.
# All rights reserved.
#
# This source code is licensed under the BSD-style license found in the
# LICENSE file in the root directory of this source tree.
"""
This is a test script that launches as part of the test cases in
run_test.py, to validate the correctness of
the method ``torch.distributed.is_torchelastic_launched()``. To do so,
we run this script with and without torchelastic and validate that the
boolean value written to the out_file is indeed what we expect (e.g.
should be False when not launched with torchelastic, True when launched with)
The script itself is not a test case hence no assertions are made in this script.
see: - test/distributed/launcher/run_test.py#test_is_torchelastic_launched()
- test/distributed/launcher/run_test.py#test_is_not_torchelastic_launched()
"""
import argparse
import torch.distributed as dist
def parse_args():
parser = argparse.ArgumentParser(description="test script")
parser.add_argument(
"--out-file",
"--out_file",
help="file to write indicating whether this script was launched with torchelastic",
)
return parser.parse_args()
def main():
args = parse_args()
with open(args.out_file, "w") as out:
out.write(f"{dist.is_torchelastic_launched()}")
if __name__ == "__main__":
main()
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