Calculations run on this device. Scenario values are not sent anywhere — the engine is fully local.
system design calculator · free
Shard-Key Heatmap
Distribute keys by hash and by range and watch the hot shard glow.
How skewed is celebrity data across 16 shards?
Engine 1.0.0 · calculation
2128
090
k
11000
100100000
- Hot shard QPS
- 4375
- Cold shard QPS
- 375
- Imbalance
- ×11.67
- Keys / shard
- 6250
Hot key dominates — consider salting or splitting the key.
16 shards, hot 40% of 10000 qps
Method
- Deterministic local model of the mechanism — knobs recompute outputs instantly with no network.
- Numbers are teaching approximations, not production capacity guarantees.