idle reclaim

Allocated means a scheduler handed the GPU out; utilized means it did work. A 60-point gap is jobs holding GPUs they do not use: idle notebooks, placeholder jobs, a loader-bound run at 20% tensor-active. The three metrics that separate the causes, the per-tenant table that names them, and the policies that close it.

A notebook holds a GPU for eight hours and uses it for twenty minutes, which is what sharing is for and what makes it hard. The sharing mode to pick and the one to refuse across users, the idle-reclaim loop that keeps sessions alive without holding hardware, the quota arithmetic, and how many GPUs 300 users need.