Load Generator Distribution Overview

Load generators are Performance Center hosts on which Vusers run during a test run.

Tip: To estimate the number of load generators that are needed to run a Vuser script, you can use the Load Generator Calculator tool (Technical Preview). On the host machine, select Start > Programs > HP Software > Performance Center Host > Tools > Load Generator Calculator.

Load Generator Types

There are two types of load generators:

Type	Description
Specific load generator	An actual load generator. For example, machine host1, located in London.
Automatch load generator	A load generator placeholder, for example LG1. When you assign an automatch load generator to a Vuser group, you are not assigning a specific load generator to the group, but rather a placeholder for a load generator with specific properties. At runtime, specific load generators in the host pool of the project that have the same properties as the automatch load generators, are allocated in place of the automatch load generators.

Type

Description

Specific load generator

An actual load generator. For example, machine host1, located in London.

Automatch load generator

A load generator placeholder, for example LG1. When you assign an automatch load generator to a Vuser group, you are not assigning a specific load generator to the group, but rather a placeholder for a load generator with specific properties. At runtime, specific load generators in the host pool of the project that have the same properties as the automatch load generators, are allocated in place of the automatch load generators.

Load Generator Distribution Methods

When you design a performance test, you specify how to distribute load generators among the Vuser groups participating in the test. You can automatically assign all load generators to each Vuser group, or you can manually select which load generators to assign to which group.

Use the following methods to distribute load generators:

Method	Description
Automatic load generator distribution	When you select the automatic load generator distribution method, during the test design phase all of the automatch load generators in the test are distributed to all of the participating Vuser groups. At runtime, specific load generators in the project's host pool that have the same properties as the automatch load generators, are allocated in place of the automatch load generators.
Manual Load Generator Distribution	Using the manual distribution method, you can assign specific load generators to Vuser groups. If you are not particular about which load generators should be used for the test, you can assign automatch load generators to the groups. At the initialization stage of the test run, the automatch load generators are automatically replaced with specific load generators from the project's host pool that match the automatch load generators' properties. Manual distribution enables you to distribute your load generators among Vuser groups, without overloading any one load generator.

Method

Description

Automatic load generator distribution

When you select the automatic load generator distribution method, during the test design phase all of the automatch load generators in the test are distributed to all of the participating Vuser groups.

At runtime, specific load generators in the project's host pool that have the same properties as the automatch load generators, are allocated in place of the automatch load generators.

Manual Load Generator Distribution

Using the manual distribution method, you can assign specific load generators to Vuser groups.

If you are not particular about which load generators should be used for the test, you can assign automatch load generators to the groups. At the initialization stage of the test run, the automatch load generators are automatically replaced with specific load generators from the project's host pool that match the automatch load generators' properties.

Manual distribution enables you to distribute your load generators among Vuser groups, without overloading any one load generator.

Load Generator Attribute Customization

You can customize load generator attributes. For details about how to customize host attributes, see the HPE Application Lifecycle Management Administrator Guide: Customizing Project Entities.

When customizing load generator attributes, consider the following:

Create attributes that represent properties about your hosts that will help tell one host apart from another host when using them for performance testing.
Because you can select multiple attributes for your host, you can define an unlimited number of host attributes. They do not need to be related.
Host attributes can refer to anything. For example, Host Memory - High, Spanish environment, Very slow machine.

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Last updated June 06, 2018