Choosing the Better Architecture with Apdex: A Practical Comparison
This article compares two system architecture designs—one with fast but unstable response times and another with consistent performance—by introducing the Apdex (Application Performance Index) metric, explaining its satisfaction thresholds, calculation method, and how it helps objectively select the superior option.
Comparing Two Architecture Options
Option A shows fast response (0.5 s) under low concurrency (<200 requests) but degrades to 10 s under high load (>1000 requests). Option B maintains a more consistent response time between 0.5 s and 4 s across loads.
Why Use a Standard Metric?
To objectively decide which option is better, the Apdex (Application Performance Index) provides an internationally recognized measure of user‑perceived performance.
Apdex Satisfaction Levels
Apdex defines three user‑satisfaction intervals based on a threshold T (default 2 s):
Satisfied : response time ≤ T
Tolerating : T < response time ≤ 4T
Frustrated : response time > 4T
Calculating Apdex
After sampling real response times, compute the index as: (Satisfied count + 0.5 * Tolerating count) / Total samples The result ranges from 0 (no satisfied users) to 1 (all users satisfied). A common target is 0.7, but teams may set higher goals such as 0.85 for stricter performance requirements.
Applying Apdex to the Options
Using the Apdex formula, you can quantify the user experience of both options and choose the architecture that delivers the higher Apdex score, balancing performance under varying loads.
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