Rate Limiter Simulator

Scenario runner

Apply configuration

Ready

Refresh analytics, time series, and latency distribution from the current inputs.

Inputs captured
Results current

Inputs

Traffic

Poisson arrivals

Duration seconds Step milliseconds Target RPS requests/sec Burst factor 0 to 1 Max concurrent in flight Queue capacity requests Max queue wait milliseconds

Policy

Rate Limiter

Cascade

Window algorithm How requests are counted inside each window

Every cascaded row below uses fixed window counters: each counter resets at the window boundary.

Cascaded windows

Each request must pass all windows in cascade. Window length is entered in seconds. Example: 1s/60 + 10s/500 + 60s/2,000.

Backend

Service Latency

Distribution

Distribution Mean latency milliseconds Std deviation milliseconds

The labels change with the selected distribution.

Shape preview Normal / Gaussian

Control plane

Rate-Limiter Latency

Decision time

Decision distribution Decision latency milliseconds Unused ignored for constant/exponential

Processing latency of the rate limiter itself. Higher values increase pending decisions and can amplify queueing/429 impact.

Shape preview Constant

Result

Analytics

Current run

Time series

Capacity, Admissions, and Rejections

Shared scale

Distribution

Latency Shape

Histogram