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Advice on configuring Controller / Agents before running a large load test

Advice on configuring Controller / Agents before running a large load test

Use the latest version of Silk Performer.

  1. Minimize traffic between the agent-controller:

    1. In the monitor window of Silk Performer set the Data collection interval of the monitor to "Manually".The default setting for this is 5 sec. To check status during the loadtest click the Refresh Now button.
    2. De-select the button "Display all Errors of all Users" in the Toolbar of the monitor window . By default this is selected.
    3. Do not check "Show output of WebUser..." in the context menu of the virtual user view of the monitor window during. By default this is not checked.

  1. Add additional network cards to agents (ensure all cards are set to full duplex) - see "Performance and Scalability Matrix" in Help.
  2. Optimize Performance Explorer to minimize communications during the loadtest. Do not monitor the Silk Performer Controller data source (Active users, Transaction Rate, Hits/s etc). By default these are monitored. To stop monitoring you can choose Remove Data Source from the context menu in Performance Explorer.
  3. Ensure the "Virtual Users per Process" is set to"Automatic"(SETTINGS | SYSTEM | WORKBENCH | CONTROL -Virtual Users)
  4. Stop all unnecessary processes running on controller / agents -this may include automatic "Windows updates".
  5. Machine specification: Despite the trend for multiple processor machines - the common loadtest bottleneck on the windows platform is I/O, so instead of using a single 8 processor machine and running all users on 1 machine it is recommended instead to use 3 or 4 "normal" 1 or 2 processor boxes.


Finally reboot the machines before starting the test to ensure that you are starting with no baggage, and that any Windows updates have taken affect.

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