Troubleshooting and Limitations - Load Generators

This section describes troubleshooting and limitations for running Vusers on load generators machines.

Load Generator not included with "All Generators"

Problem: I am adding a Vuser group to a scenario in percentage mode. When I click All Generators to add all the load generators to the scenario, the load generator called "localhost" is not added.

Cause: By default, the load generator called "localhost" is defined as a Low Priority LG. Any load generator defined as a Low Priority LG is not included when clicking the All Generators button.

Solution:

Do one of the following:

  • Manually add the host that was not included

  • Give "localhost" a different name, for example 127.0.0.1

  • Shut down the Controller and edit <Installation directory>\Config\wlrun7.ini file. Under[General], add the following line:

    HostWithLowPriority=

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Overloading of CPU

If you receive a warning indicating that the load generator machine has reached 80% of the CPU resources, make sure that your load generator machine conforms to the recommended system requirements as stated in the Readme file.

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Custom Cipher

For communication between the various LoadRunner components (such as Controller and Load Generator, MI Listener etc.) you may need to specify your desired cipher. To do so, add a [SSLCipher] section to the config/m_agent_attribs.cfg file. Add the cipher name attribute using this syntax: "SSLCipherList=<cipher_string>". For details, see https://www.openssl.org/docs/manmaster/man1/ciphers.html.

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Virtual Machines

LoadRunner supports the latest versions of VMware ESX. However, running Vusers on virtual machines may adversely affect performance due to the sharing of physical resources.

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VB and C# Projects

You cannot run VB and C# projects created with the Visual Studio add-ins on load generators with limited user permissions.

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Limited Users

You cannot run LoadRunner projects created in Visual Studio (VB and C#) on remote load generators if they were launched by a limited, non-admin user.

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ODBC scripts on Linux machines

When running ODBC scripts on RHEL 6, you may encounter the following replay error:

lrdb_open_connection: "SQLConnect", return-code=-1, native-error-code=0, SQLState=01000, SQLError=[unixODBC][Driver Manager]Can't open cursor lib 'libodbccr' : file not found"

Workaround: Create a libodbccr.so.1 soft link to libodbccr.so.2.0.0 using the following syntax:

n -s libodbccr.so.2.0.0 libodbccr.so.1

For details, see https://bugzilla.redhat.com/show_bug.cgi?id=719595.

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GUI Vusers

Windows Load Generator machines can only run one GUI Vuser at a time. To run multiple GUI Vusers in a load test, you need to open a terminal server session for each GUI Vuser.

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Non-English Locales

Scripts containing Japanese symbols may generate errors during replay or fail during replay, when running on Linux load generators set to a Japanese locale.

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