What Are the Apdex and Apdex Threshold?

Updated on 2024-03-05 GMT+08:00

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Application Performance Index (Apdex) is an open standard developed by the Apdex alliance to measure application performance. The application response time is converted into user satisfaction with application performance. The Apdex value ranges from 0 to 1.

Apdex Principles

An Apdex threshold is the optimal threshold for the application response time. Based on the Apdex threshold and actual application response time, there are the following three kinds of performance:

Satisfied: The actual application response time is less than or equal to the Apdex threshold. For example, if the Apdex threshold is 1.5s and the response time is 1s, the result is satisfied.

Tolerable: The actual application response time is greater than the Apdex threshold, but less than or equal to 4 times of the Apdex threshold. For example, if the Apdex threshold is 1s, the tolerable upper threshold for the application response time is 4s (4 x 1s).

Frustrated: The application response time is greater than 4 times of the Apdex threshold.

Click to enlarge

Apdex Calculation Method

In Application Performance Management (APM), the Apdex threshold is the threshold configured according to Setting Apdex Thresholds, and the application response latency is the service latency. The Apdex value ranges from 0 to 1 and is calculated as follows:

Apdex = (Satisfied samples x 1 + Tolerable samples x 0.5 + Frustrated samples x 0)/Total number of samples

Apdex calculation results indicate application performance status, that is, user satisfaction with application performance. Different colors indicate different Apdex ranges. For details, see Table 1.

**Table 1** Apdex description
Apdex Value	Color	Description
0.75 ≤ Apdex ≤ 1	Green	Fast response; good user experience
0.3 ≤ Apdex < 0.75	Yellow	Slow response; fair user experience
0 ≤ Apdex < 0.3	Red	Very slow response; poor user experience
-	Gray	No application, instance, or transaction is invoked.

Example

Click to enlarge

As shown in the preceding figure, the number of satisfied calls is 50, the number of tolerable calls is 0, the number of frustrated calls is 30, and the number of error calls is 0. There are 80 calls in total.

According to the formula:

Apdex = (Satisfied samples x 1 + Tolerable samples x 0.5 + Frustrated samples x 0)/Total number of samples

Apdex = (50 x 1 + 0 x 0.5 + 30 x 0)/80 = 0.63

Configuring an Apdex Threshold

You can configure the Apdex threshold as required. For details, see Setting Apdex Thresholds.

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