[DP] Create placement groups by ray_device_key #25026
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xinyu-intel
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alexm-redhat,
comaniac,
njhill,
robertgshaw2-redhat and
ywang96
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Code Review
This pull request refactors the data parallel placement group creation logic to use a dynamic device key from current_platform.ray_device_key instead of a hardcoded "GPU" string. This is a good improvement for supporting various hardware backends like TPUs. My review identifies a potential KeyError if data parallelism is attempted on a platform where ray_device_key is empty. I've suggested adding assertions to provide a clear error message in such cases.
| "No nodes with resources found in Ray cluster.") | ||
| assert dp_master_ip_key in nodes[0], ( | ||
| "The DP master node (ip: %s) is missing or dead", dp_master_ip) | ||
| device_str = current_platform.ray_device_key |
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The ray_device_key can be an empty string for platforms that do not support Ray. If device_str is empty, it will cause a KeyError when used to access node_resources on line 345. It's better to add an assertion to ensure device_str is not empty, which provides an early and clear error message if data parallelism is attempted on an unsupported platform.
device_str = current_platform.ray_device_key
assert device_str, (
"current_platform.ray_device_key is empty, indicating that data "
"parallelism with Ray is not supported on this platform.")| local_dp_ranks = [] | ||
| num_pg_created = 0 | ||
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| device_str = current_platform.ray_device_key |
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Similar to the create_dp_placement_groups function, ray_device_key can be an empty string here. If device_str is empty, it will cause a KeyError when used to access available_resources and total_resources on lines 427 and 431. An assertion should be added to ensure device_str is not empty and fail early on unsupported platforms.
device_str = current_platform.ray_device_key
assert device_str, (
"current_platform.ray_device_key is empty, indicating that data "
"parallelism with Ray is not supported on this platform.")
Signed-off-by: Xinyu Chen <[email protected]> Co-authored-by: Kunshang Ji <[email protected]>
Signed-off-by: Xinyu Chen <[email protected]> Co-authored-by: Kunshang Ji <[email protected]> Signed-off-by: charlifu <[email protected]>
Signed-off-by: Xinyu Chen <[email protected]> Co-authored-by: Kunshang Ji <[email protected]> Signed-off-by: xuebwang-amd <[email protected]>
Signed-off-by: Xinyu Chen <[email protected]> Co-authored-by: Kunshang Ji <[email protected]>
2 participants
to support create placement groups for dp with other kinds of ray device.