Slurm节能插件优化需求：云环境节点调度逻辑调整

Great question—this is a super practical optimization for cloud-based Slurm clusters, where you want to minimize unnecessary VM spin-ups and make the most of nodes that are already in the process of starting up. Let’s break down how to fix this behavior:

1. Tune Slurm Scheduler to Account for Powering-Up Nodes #

First, you need to adjust Slurm’s core scheduler settings to recognize nodes that are still booting up as viable targets for new tasks. By default, some configurations ignore these nodes when assigning work.

Add or update this line in your slurm.conf file:

SchedulerParameters=consider_powering_up_nodes

This flag tells the scheduler to include nodes in the POWERING_UP state when calculating available resources.

Also, double-check your node capacity configuration matches your 10-task limit per VM. If each node supports 10 concurrent tasks, set:

TasksPerNode=10

If you’re using core-based scheduling instead, set CPUs=10 (matching your VM’s vCPU count) and SelectTypeParameters=CR_Core to align task capacity with core availability.

2. Adjust Your Custom Energy-Saving Plugin Logic #

Since you built a custom plugin, you’ll need to modify its node-provisioning workflow to prioritize existing powering-up nodes before spinning up new VMs. Here’s the key logic to implement:

• When a new task hits the queue, first use Slurm’s API (like slurm_load_nodes) to fetch all nodes in the POWERING_UP state.
• For each of these nodes, calculate remaining task capacity:

  # Pseudocode example (adapt to your plugin's language)
  remaining_capacity = node.tasks_max - node.tasks_alloc
  

• If any powering-up node has enough remaining capacity for the new task(s), route the work to that node instead of triggering a new VM creation.
• Only when all powering-up nodes are at full capacity (or none exist), initiate a new cloud VM.

This ensures you’re leveraging nodes that are already in the startup pipeline, rather than wasting resources on redundant instances.

3. Validate the Behavior #

Test your changes to confirm everything works as intended:

• Submit your first task: Use sinfo to verify the node enters the POWERING_UP state.
• Immediately submit a second task: Check squeue to confirm the task is assigned to the same powering-up node (not a new one).
• Submit 10 more tasks (total 11): This should trigger a second node to spin up, since the first node’s 10-task limit is reached.

内容的提问来源于stack exchange，提问作者James Pinkerton