mcore-onboard-gb200-1node-tests

To convert 2-node GB200 tests to 1-node variants, generate _1node model_config.yaml directories and adapt tensor and parallelism settings for a 4-GPU setup. You also update test recipes and align branching scope with the mr-github workflow.

A 1-node GB200 test variant is a 4-GPU configuration derived from existing 2-node Megatron-Core test suites. It involves creating _1node directories and adjusting parallelism settings to validate changes within a single-node environment.

You wire Megatron-Core MR tests with the mr-github scope by updating the test recipe scope during the 1-node onboarding process. This ensures the 1-node GB200 configurations align with GitHub MR branching workflows.

Yes, onboarding 1-node GB200 tests requires adapting tensor and parallelism settings. When generating the _1node model_config.yaml from existing 2-node tests, configurations must be adjusted to support the 4-GPU single-node architecture.

The best way to create 1-node test directories is to copy existing 2-node GB200 test configs and generate dedicated _1node directories. You then populate them with adapted model_config.yaml files and update the corresponding test recipes and mr-github scopes.