Requirements & constraints:
- Shared expensive GPU pool (fixed capacity), distributed teams in multiple time zones, async-first (no synchronous booking required), high utilization, low wasted cycles, safe multi-tenant behavior, predictable fairness.
High-level architecture:
- Centralized scheduler + job queue (supports priority, preemption, checkpoints)
- Per-team quotas + user-level leases
- Lightweight web UI + REST/CLI + chat-bot integration for booking/status (Slack/MS Teams)
- Monitoring, auditing, cost metrics, and an on-call escalation service
Resource allocation rules:
- Monthly team quota (GPU-hours) + burst buffer shared across teams; per-user soft limits; RBAC controls who can request reserved slots
- Priority classes: interactive (short dev/debug runs), experiment (regular training), long-run (overnight/long-scale). Scheduler enforces slot sizes (e.g., 1/2/whole node) and packing to reduce fragmentation
- Fair-share algorithm: decayed historical usage influences current priority; quota exhaustion moves jobs to lower priority or waiting state
- Preemption: interactive/debug jobs can preempt low-priority jobs with checkpoint/resume support and a configurable graceful drain window (e.g., 5–15 minutes)
Booking & async communication:
- Job manifests (YAML) submitted via CLI/UI including metadata: owner, team, priority, estimated runtime, checkpoint frequency, dataset snapshot, docker image, GPU type
- Chat-bot commands: submit, status, cancel, expect-start, ETA — returns queue position + estimated start time
- Calendar-free booking: optional “reservation” tokens for guaranteed windows (paid from team quota); otherwise rely on queue with ETA
- Status pages + per-job URLs for logs/metrics; webhook notifications to chat channels on start/finish/fail
Troubleshooting & stuck-job handling:
- Automated health checks: heartbeat from job agent; watchdog kills if no heartbeat for X minutes
- Log streaming + sample profiler traces in UI; artifacts pushed to object store
- Auto-retry policy with exponential backoff configurable per job; fail-fast toggle for hardware errors
- Runbook link attached to each job type; common troubleshooting snippets exposed in UI (OOM, driver mismatch, dependency failures)
Escalation paths:
- Automatic remediation: restart container, reschedule to healthy node, notify owner
- Owner notification via chat + job page; if not acknowledged within SLA (e.g., 30 minutes) escalate to team lead
- Ops on-call pager if job causes cluster-wide issues (node failure, GPU thermal events) or resource leak; include audit trail for rapid diagnosis
- SLA matrix documented: owner —> team lead —> infra on-call —> platform engineering
Practices to minimize wasted GPU time:
- Mandatory small-scale smoke test on CPU or single GPU (quick 5–10 min) before booking large runs
- Checkpointing every N minutes/epochs; enforce efficient checkpoint formats and incremental saves
- Encourage mixed-precision and gradient accumulation to reduce GPU time without changing hyperparameters
- Use pre-run validations: dependency/container hash, GPU driver check, dataset accessibility
- Autoscaling for ephemeral capacity (cloud spot instances) with graceful preemption and checkpointing
- Encourage reproducible seeds, dry-run flags, and model profiling (time per step) to set accurate estimated runtimes
- Incentives & visibility: weekly utilization reports per team, cost chargebacks, and “waste” metrics (failed runs, early cancellations) to drive behavior
Trade-offs & rationale:
- Async-first reduces cross-timezone friction; quotas + fair-share balance fairness and productivity
- Preemption increases utilization but requires robust checkpointing and user discipline
- Reservation tokens allow guaranteed access for critical experiments while preserving general fairness
Operationalizing:
- Start with conservative quotas and tight smoke-test enforcement, iterate policies with telemetry
- Expose simple APIs so teams can integrate CI/CD and automated dry-runs
- Regular retrospective on utilization and policy tweaks every quarter
This model keeps teams productive across time zones, maximizes GPU utilization, and minimizes wasted cycles through automation, clear rules, and async-first communication.