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Tested this locally and on SLURM. The monarch hostmesh piece will be automatically set in the install script for now so users don't have to do this.

@allenwang28 allenwang28 requested a review from vidhyav October 14, 2025 18:41
@meta-cla meta-cla bot added the CLA Signed This label is managed by the Meta Open Source bot. label Oct 14, 2025
Comment on lines 312 to 314
# Temporary measure until this environment variable is removed
export MONARCH_HOST_MESH_V1_REMOVE_ME_BEFORE_RELEASE=1
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Is it possible to stage this in two PRs?

First, move to v1 as default and then remove all the v0 code as another PR? Can help us easily revert if needed in the future.

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Small nit.

)

MONARCH_HOSTMESH_V1 = EnvVar(
name="MONARCH_HOST_MESH_V1_REMOVE_ME_BEFORE_RELEASE",
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(y)

@allenwang28 allenwang28 merged commit 9782f57 into meta-pytorch:main Oct 14, 2025
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@allenwang28 allenwang28 deleted the only_hostmesh_v1 branch October 14, 2025 19:49
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2 participants