Scheduling Dense Compute Without Lying to Yourself

I have been thinking a lot about scheduling lately, especially once warm starts and reservations enter the picture. Schedulers are easy to make impressive in a slide deck. They are much harder to make honest. You can pack nodes aggressively, overcommit a little, and brag about utilization. Then a few bad placement calls land on the wrong hosts and the whole thing feels brittle. That is why I care…