1. PERFORMANCE TESTING

2. WHAT IS PERFORMANCE TESTING
Although performance testing is a part of system testing, it can be regarded as a distinct level of testing
The purpose of Performance testing is to measure and evaluate the response times, transaction rates and other time sensitive requirements of an application in order to verify that performance requirements have been achieved.

3. Load and Stress Testing
1. Load Testing :Load testing is testing an application under heavy loads, such as the testing of a web site under a range of loads to determine at what point the system response time will degrade or fail
2. Stress Testing :Stress testing is testing the system performance where some complicated activities like DB queries or repeated actions are applied on the system.

4. CAN U PERFORM MANUALLY ???…..

5. All of you, click the GO button again
Manual Testing Is Problematic
Coordinator
Do you have the testing resources?
Testing personnel
Client machines
All of you, click the GO button again
How do you coordinate and synchronize users?
How do you collect and analyze results?
How do you achieve test repeatability?
Web server
Database server
Testers
Load Generation
Analysis?
123.20
System Under Test

6. BENEFITS OF AUTOMATION !!!!!….

7. The LoadRunner Solution
Controller manages the virtual users
Replaces testers with virtual users
Solves the resource limitations
Runs many Vusers on a few machines
Controller
Analysis
Analyzes results with graph & report tools
Repeats tests with scripted actions
Web server
Database server
Vuser host
Load Generation
System Under Test

8. Testing Process of LOAD RUNNER
Planning the Test.
Creating Vuser Scripts.
Creating the Scenarios.
Run the scenarios.
Analyzing the test Results.

9. Vuser Scripts: Virtual User Generator
Web server
Database server
Virtual User Generator

10. Virtual User Generator Script
Script consists of 3 sections…
Vuser_init( ) ----login to server
Actions clients activities
Vuser_end( ) ----logoff

11. Virtual User Script Model
Logon
(recording
optional)
vuser_init.c
User Actions
(Business Processes)
Action1.c, Action2.c, etc.
(e.g., Create Order, Ship Order)
This section may be iterated (repeated) during one test run
Logoff
(recording
optional)
vuser_end.c

12. Virtual Users Several types of vusers GUI vusers WEB vusers RTE vusers
TUXEDO vusers
DB vusers
……………..

13. Scenario
Vuser Scripts Vusers ++++ Host machines
CONTROLLER

14. Managing Scenario Execution (Performance Under Gradual Load)
The Controller:
Gradually build up load on the server
load all Vusers
release Vusers in defined time intervals
disable Rendezvous
manually kill Vusers when all have been running and you’ve obtained enough transactions to measure
The Vuser:
Run time settings
set number of iterations to be very high (i.e. 9000)
ignore think times

15. Analysis Tools Graphs and Reports
Analyze various load issues
How many Vusers were running at any point?
How many transactions executed at any point?
Which transactions passed/failed?
What was the transaction response time?
What was the performance under gradual load?
Pinpoint problem areas
determine what is causing bottlenecks for each transaction
view several graphs simultaneously
zoom to focus on areas of interest
filter to view specific transactions

16. Running Vusers
How many Vusers were running at any point during execution?
gradual user load

17. Rendezvous
See how rendezvous influenced transaction performance

18. Transaction Performance
What was transaction response time at any point during execution?
Where does performance deteriorate?

19. Performance vs. Load View Multiple Graphs

20. Transaction Performance Summary
Why is the Average so far from the middle of Min and Max?…(next slide)

21. Percentile
Percentage of transactions performed within a given time range
notice 90% of the Simple_Inquiry transactions executed within 3 seconds

22. Cross Scenario Graphing
Compare results from two Scenario executions in the same graph(s)

23. Monitor Network Delay
Which network segment is causing the delay?

24. Monitor Resources
How is the server handling the load?

25. Performance Tunings
Once u find the factors such as network delays, server resources, or transaction breakdowns , those influencing performance of application, by tunings u can achieve better performance….