fair share scheduling

**Fair share scheduling** is the **scheduler policy that balances access over time by accounting for historical resource consumption** - it prevents chronic overuse by frequent heavy users and promotes long-term equitable cluster utilization. **What Is Fair share scheduling?** - **Definition**: Dynamic priority adjustment based on each user or group cumulative past resource usage. - **Core Principle**: Recent heavy consumers receive lower effective priority until usage balance recovers. - **Scope**: Applied across users, teams, projects, or organizational hierarchies. - **Policy Inputs**: Usage windows, decay factors, target shares, and queue wait modifiers. **Why Fair share scheduling Matters** - **Equity**: Prevents persistent dominance of shared resources by a small subset of users. - **Predictability**: Teams can expect reasonable long-term access even during high-demand periods. - **Utilization**: Fair-share systems can maintain high occupancy while distributing opportunity more evenly. - **Conflict Reduction**: Transparent share rules reduce scheduling disputes between groups. - **Platform Trust**: Perceived fairness is critical for adoption of centralized training infrastructure. **How It Is Used in Practice** - **Share Model**: Define target allocation percentages by business priority and team commitments. - **Decay Tuning**: Set historical usage decay so old heavy usage does not over-penalize indefinitely. - **Policy Review**: Audit fairness outcomes regularly and recalibrate weights with stakeholder input. Fair share scheduling is **a cornerstone policy for multi-tenant cluster governance** - usage-aware priority balancing keeps high-demand environments equitable and operationally stable.