Ticket 24994

Summary: *_nodes_alloc metrics reports inflated counts
Product: Slurm Reporter: Charlie Getzen <charliegetzen>
Component: slurmctldAssignee: Michael Steed <msteed>
Status: OPEN --- QA Contact:
Severity: 4 - Minor Issue    
Priority: --- CC: felip.moll, msteed
Version: 26.11.x   
Hardware: Linux   
OS: Linux   
See Also: https://support.schedmd.com/show_bug.cgi?id=24999
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Attachments: node_bitmap solution

Description Charlie Getzen 2026-04-08 13:57:31 MDT 
Created attachment 44909 [details]
node_bitmap solution

## Problem

`slurm_user_jobs_nodes_alloc` and `slurm_jobs_nodes_alloc` report inflated node counts when a user runs multiple sub-node-sized jobs that shared physical nodes.

## Root cause

`nodes_alloc` is computed by summing `total_nodes` across each individual running job for the user. When multiple jobs fit on the same physical node (e.g. jobs requesting only a fraction of a node's CPUs), each job contributed its own `total_nodes = 1` to the sum, even though they all shared the same node.

## Solution

Track node allocation using bitmaps and OR each job's `node_bitmap`. After all jobs have been processed, count the set bits to get the actual number of unique nodes in use.
Comment 1 Michael Steed 2026-04-14 14:07:43 MDT 
https://support.schedmd.com/show_bug.cgi?id=24999
Comment 2 Felip Moll 2026-04-20 07:01:18 MDT 
Hi Charlie,

Thanks for reporting. We are aware of this issue and a new fix is being implemented.
We'll let you know once it is done.

Thanks!