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Gap constrains + reservation fixed #1136

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8abc231
Gap constrains + reservation fixed
spirali Sep 17, 2026
caad735
Gap sanity check
spirali Sep 29, 2026
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14 changes: 14 additions & 0 deletions CHANGELOG.md
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Expand Up @@ -6,13 +6,27 @@

* The server scheduler now contains a safety limit for computation, configurable via `--scheduler-time-limit` (default: 5s)
* Better scheduling policy (prefill) for heterogenous clusters
* Workers held for a waiting high-priority task are now chosen per priority threshold, so fewer
workers are held back and more lower-priority work can run elsewhere
* More precise computation of gap for low-priority tasks

### Fixes

* Fixed some occasional greedy backfilling in server scheduler + improvements in the reservation algorithm
* Fixed server crash in a specific situation when an unschedulable high-priority task occurs
* Fixed server crash caused by invalid handling of prefill
* Fixed canceling of prefilled tasks
* Fixed multi-node tasks that could be placed on workers from two different worker groups
when worker ids of the groups interleaved
* A held worker is no longer switched to a different worker only because small tasks were placed
into its unusable remainder; the scheduler moves a hold only to a worker that is at least as free
for the waiting task, so held capacity is not repeatedly given away
* Reservations: reservations respect priorities, and they no longer block resources
the waiting task could never use
* Fixed wrong resource amounts in this computation for tasks with resource variants on workers
that lack some resource
* Fixed constraining gap that could lead to priority inversion


## v0.26.2

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