Controller

Controller

§  Used for defining Scenarios (Manual or Goal Oriented) to perform the different test executions
§  Used to manage and maintain the scenarios
§  Controls all Vusers in a scenario from a single workstation
§  While executing a scenario, it distributes each Vuser to a Load Generator


Scenario
Loadrunner scenario is combination of elements that defines a load test. Please look at below diagram for more clarity.



There are 2 types of scenarios
1)      Manual Scenario
2)      Goal oriented scenario

There are below goals in Goal oriented scenario
1)      Hits per second
2)      Transaction response time
3)      Number of VUsers
4)      Transactions per second (TPS)
5)      Pages downloaded per minute

Manual Vs Goal oriented scenario
Manual Scenario
Goal oriented scenario
Manual control over how many VUser runs and at what time
Goal may be response time or number of concurrent VUsers Loadrunner manages VUsers automatically
Add, start and stop VUsers interactively during scenario run
Cannot add, start and stop VUsers interactively during scenario run

Different tabs in controller looks something like this

Agent
§  The LoadRunner Agent enables the Controller and the load generator to communicate with each other when a Scenario is run from the Controller
§  Agent receives instructions from the Controller to initialize, run, pause and stop VUsers
§  Agent also relays data on the status of the VUsers back to the Controller simultaneously



Ramp up

§  Loading of all VUsers in the scenario
§  Timed increments pinpoint the exact point at which a system/software fails or degrades


Ramp down

§  Only applicable for scenarios where in the Duration tab Run for option is selected
§  Specify how many Vusers to stop and how often
§  Can be used to detect memory leak and system recovery after heavy load


Schedule by Group and Schedule by scenario

In schedule by scenario, same schedule is applied across all the groups. You can only run all scripts together.

In schedule by group, individual schedule settings can be set for each group. You can run each script one after other based on your need.

Run Mode

There are 2 types of run modes
1)      Real world schedule
2)      Basic schedule

In real world schedule, you can specify the ramp up details, ramp down details and duration to run the test.

In Basic schedule you need to specify the number iterations. The script in the test will run for those many iterations.





Something to remember
- Results are stored locally on each load generator
- After execution, results from all load generators are transferred to the Controller’s results directory for analysis










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