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Preparing a Distributed Test Run
Preparing a Distributed Test Run
The resources of a single workstation can be insufficient to create a load required to test a web application
running on a powerful server. That is why WAPT Pro can use several computers
for load generation. Such tests will let you emulate almost any
desired number of simultaneously acting virtual users.
You should install WAPT Pro Workplace on the main machine where you will manage test runs
and install Load Agents on computers that will generate the load during tests. Workplace component
will be used only for test management purposes - from the initial design of test sequence to the final reporting.
All testing jobs (emulation of real user activity and load generation) will be performed on servers running
Load Agents.
Load Agents are installed as Windows services,
so you will not need to launch them each time you want to perform testing.
Communication between agents and workplace component is done over TCP/IP.
You should specify the list of Load Agents in WAPT Pro Workplace:
1. Select Distributed test run -> Load Agents
in the Navigation Pane to switch to the Load Agents view.
2. Click Search LAN for available load agents to search for agents in
the Local Area Network. The program uses the default port 9474
to search for Load Agents and establish connections to them.
However, you can uncheck the Use default port option and specify another port.
All found agents are displayed in the list below.
If some agent is located outside LAN, you can add it manually
using the Add button.
3. For any agent in the list you can see its status (Online or Offline) and
percentage of CPU, Memory and Network utilization.
Each utilization value is the result of data averaging over the last 30 seconds for that agent.
If the utilization of resource reaches 80% (warning level), the corresponding line is
highlighted in yellow.
If the utilization reaches 98% (overload level), the corresponding line is
highlighted in red.
4. Analyze this information and decide which agents will participate in the test.
Put checkmarks near agents that you want to use in the test.
There is a limitation on the number of Load Agents that you can use simultaneously in your tests.
Unregistered version of WAPT Pro provides you with 2 available Load Agents.
Click the Register WAPT Pro... button to
register the product.
In the registered version of WAPT Pro
the maximum number of Load Agents that you can use simultaneously is displayed on the program title bar.
If you need to use more agents in your tests, click the Register more agents... button to buy a
license for additional keys.
You can use the following buttons to manage the list of agents.
Add: Adds a new Load Agent to the list. You should specify agent settings in the displayed dialog.
Remove: Removes a selected agent from the list. Edit: Opens a dialog where you can edit the settings of selected agent. Refresh: When you click this button, WAPT Pro Workplace tries to
reconnect to those Load Agents in the list that have the status "Offline".
How WAPT Pro Workplace Distributes the Load During Tests
You do not need to specify how many virtual users should be emulated by each Load Agent. This is done automatically
during the test. WAPT Pro Workplace
reallocates tasks between agents depending on the resources available on each system.
If you run Load Agents on computers with different
hardware configuration, then more productive systems will produce more virtual users.
If the CPU, Memory or Network
utilization of some agent reaches 80% (warning level),
WAPT Pro Workplace stops increasing the load for that agent.
Additional load is reallocated to other agents.
If the utilization of all Load Agents reaches 80% level, WAPT Pro Workplace
will again distribute the load between all agents until some of them reaches 98% level of utilization.
If the utilization of some
agent reaches 98% (overload level),
WAPT Pro Workplace stops increasing the load for that agent.
Additional load is reallocated to other agents.
If the utilization of all agents reaches 98% level, WAPT Pro Workplace
will again distribute the load between all agents.
WAPT Pro Workplace uses the described mechanism of load balancing if the
Automatically balance load generation between agents option is turned on.
If you uncheck this option, then each Load Agent will emulate the same number of virtual users.
Note that during test run this option is disabled.
You should set it before the test begins.
Products
If the utilization of resource reaches 80% (warning level), the corresponding line is
highlighted in yellow. 
If the CPU, Memory or Network
utilization of some agent reaches 80% (warning level),
