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LoadRunner Active VUser Count

Problem:

How to get the active VUser count at any point in time in LoadRunner?

Explanation:

LoadRunner executes the script in the controller or Performance Center and generates the required number of Virtual Users (VUsers). But not all the VUsers are active full-time, especially when the login and logout part is in the Action(). If you want to know how many VUsers are active at a particular time, then follow the steps below.

Solution:

Prerequisite:

As a prerequisite, you need to first identify how many TCP/IP connections are established by one VUser during the test. For this purpose:

  1. Comment out the “Logout” transaction of the VUGen script
  2. Run the test for a few minutes. The test duration should be long enough to complete at least one iteration
  3. Collate the result
  4. Open the result file in the LoadRunner Analysis Tool
  5. Open the “Connections” graph
    Graphs->Add New Item->Add New Graph->Web Resources->Connections
  6. Note down the number of connections established during the one-user test (No. of Connections = 6; Refer the below screenshot)
LoadRunner Connections Graph for Active VUser Count
Figure 01: “Connections” Graph of one VUser Test

Actual Test:

  1. Run the actual test with a full load
  2. Collate the result after test completion
  3. Open the result file in the LoadRunner Analysis Tool
  4. Open the “Connections” graph
    Graphs->Add New Item->Add New Graph->Web Resources->Connections
  5. Hover the mouse on the graph and get the “Number of Connections” value. Refer to the screenshot below, where at 00:11:00, the number of connections is 36.000. Note down this value.
LoadRunner Connections Graph
Figure 02: “Connections” Graph of 10 VUsers Test

Calculation of the Number of Active VUsers at a particular time:

Number of Active VUsers = Total Connections at that time / Connection made by one user

=> Number of Active VUsers at 00:11:00 = 36 / 6
=> Number of Active VUsers at 00:11:00 = 6

Hence, 6 VUsers are active at 00:11:00. Similarly, you can calculate the Active VUser count at a different time in the LoadRunner test.

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