enable execution of external prolog/epilog for A4X

[Neelabh94]

The PR adds enable_external_prolog_epilog: true flag to the a4xhigh-slurm-blueprint.yaml.

Why it should be enabled

The blueprint is already staging several critical scripts via the controller_scripts section into the /opt/apps/adm/slurm directory:

imex_prolog / imex_epilog: Required for NVIDIA IMEX (Interrupt Management and Execution) support.
gpu-test: A cluster health check to ensure GPUs are functional before/after jobs.
sudo-oslogin: Enables passwordless sudo for authorized users.

Without this flag, while these scripts are successfully downloaded and placed on the disk, Slurm will never execute them because the necessary "multiplexer" infrastructure and Slurm configuration changes are not applied.

Submission Checklist

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• Follow Cluster Toolkit Contribution guidelines #

[gemini-code-assist]

Summary of Changes

Hello, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request resolves a critical configuration oversight in the A4X high-GPU blueprint by activating a flag that ensures the proper execution of essential Slurm scripts. This activation guarantees that vital system functionalities, including GPU health monitoring and NVIDIA IMEX support, are correctly integrated and operational within the Slurm environment, thereby enhancing the overall stability and performance of the system.

Highlights

• External Prolog/Epilog Activation: The enable_external_prolog_epilog: true flag has been added to the a4xhigh-slurm-blueprint.yaml configuration. This change is crucial for enabling Slurm to execute pre-staged critical scripts, such as imex_prolog, imex_epilog, gpu-test, and sudo-oslogin, which are necessary for NVIDIA IMEX support, GPU health checks, and passwordless sudo functionality.

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[gemini-code-assist]

Code Review

This pull request introduces a configuration change to enable external prolog/epilog for the a4x-highgpu-4g Slurm blueprint. The review suggests an improvement to enhance configurability and maintainability by defining enable_external_prolog_epilog as a variable in the vars section, allowing users to easily enable or disable this feature without modifying the core blueprint.