Test Download
The Test Download tab is accessed from Performance | Testing | Test Download.
The Zend Download Server (ZDS) is a transparent process that runs in the background to service large downloads. The performance gain obtained by using the ZDS is measured with the Test Download option.
The Test Download option checks the efficiency of the Download Server. Test Download simulates multiple requests for a specified URL with and without the ZDS, thereby creating its own benchmark for comparison. This feature is currently not applicable for Windows Operating Systems.
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To Run a Download Test:
Go to: Performance | Testing and choose the Test Download tab.
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Enter the URL for Testing. (The default is a proprietary Zend PHP script which uses zend_send_file() to send a file.)
Note: Testing very large files will take a very long time.
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Enter the bandwidth limit you want to simulate for the clients (For a faster test, select a higher bandwidth).
Note: Do not select full bandwidth; doing so will saturate your network card that will make the test irrelevant. The test tries to simulate a typical Internet server that has clients connected either by ISDN or DSL.
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Enter the Max Clients value defined for your server. Insert the accurate value by checking the MaxClients directive in the httpd.conf file.
Note: The ZDS installation tries to identify your MaxClients value via the httpd.conf file that is the GUI’s default value, but this value can be changed after the installation, so it is important to verify that the value listed is correct.
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Click "Run" to run the Download Test.
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Viewing Download Test Results
Once the tests have completed, you can view the test results both statistically and graphically.
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To view the results of the most recent Download Test:
From the Test Download Tab click, "Show Last Download Test Report". The test report includes tables and graphs that display the Requests per Second and Number of Concurrent Requests for each test run.
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Note:
The Download Test is a simulation. The most meaningful test results are obtained by running ZDS on the production server and monitoring the log file to see how many concurrent jobs the ZDS is handling.
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