Apdex (Application Performance Index)

Apdex (Application Performance Index) is an open standard for turning response times into a single satisfaction score between 0 and 1. You choose a target threshold T. Requests at or under T are satisfied, those between T and 4T are tolerating, and slower ones are frustrated.

Why it matters

A score is easy to put on a dashboard and to compare across services, which helps non-specialists see whether performance is acceptable. It reduces a mass of timing data to one number that can be tracked over time or alerted on.

Example

The formula is:

Apdex = (satisfied + tolerating / 2) / total samples

With T = 0.5 s and 100 requests: 80 under 0.5 s, 15 between 0.5 and 2 s, 5 slower.

Apdex = (80 + 15/2) / 100 = 0.875

A common reading is 0.94 to 1.0 excellent, 0.85 to 0.93 good, 0.70 to 0.84 fair, and lower is poor.

Common mistakes

• Choosing T carelessly. A loose T makes the score look great while users wait.
• Using the same T for very different operations, such as search and report export.
• Treating the number as precise. It hides the shape of the distribution, so check percentiles as well.

Related

• Percentile (p95, p99)
• Latency
• APM
• SLI

यह पेज सामान्य जानकारी है, जिसे हमारी संपादकीय टीम ने लिखा है और दस्तावेज़ीकरण बदलने पर अपडेट किया जाता है। सर्वर और प्रदाता अलग-अलग होते हैं, इसलिए बदलाव पहले सुरक्षित तरीके से जाँचें। देखें: संपादकीय नीति और अस्वीकरण.