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Please find the latest manual for Webserver Stress Tool here:

Manual Webserver Stress Tool (pdf)

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Graph Spectrum of Click Times

This graph shows the distribution of user wait times for each run in the test.

image18 27

This sample graph shows the results of a Ramp Test. The three axis are:

·      Vertical: percentage of users

·      Horizontal: user wait time

·      Depth: Number of users

At the beginning of the test (first bars at the front of the chart) most users get request times below 2 seconds.

image18 28

With more and more users accessing the server the request times deteriorate, the bar’s maximum is moving from left to right with increasing depth.

In this other sample the effect is still visible, but the request times at the end of the test are still below 5s.

image18 29

The affect of this test on capacity planning is clear. Consider that the maximum response time goal for each user should be ten (10) seconds or less. With this goal in mind, you have to make sure that your graph has its maximum at the "<10s" reading or better – for the number of users you want to be able to support.

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