Parallel Job Load Planner

How to use Parallel Job Load Planner

Choose entered order or sort by decreasing duration. Each next job goes onto the least-loaded machine, with machine order breaking ties. The export gives starts, finishes and a lower bound from the largest job and average total load.

1. Enter job json (id, duration), identical machines.
2. Choose the stated convention and check the units and supported model.
3. Calculate, inspect the result, then copy or download it.

Good to know

• Exact-grid inputs are plain decimals with at most six places and magnitude≤1e9. Raw JSON number spelling is checked before conversion; decimal strings can preserve exact grid values. Exact rational intermediates are bounded to 8192 bits. Up to 200 positive-duration jobs and 20 identical machines, all available at time zero. No preemption, dependencies, release times, setups, deadlines or calendars. These are heuristics; optimality is only certified when the produced makespan equals the displayed mathematical lower bound. A larger gap is not an optimality gap certificate.
• Local calculation only; no input persistence or external lookup. Text/JSON is limited to 30000 characters and output to 1000000 characters. Numeric model inputs and precision/work limits are stated on this page. Approximate JSON numbers retain full stored values; exact arithmetic outputs retain decimal or fraction strings. Unsupported states fail explicitly.
• Educational user-assumption arithmetic only. No live prices, laws, tax rules, quotes or financial advice.