What is performance testing?
Performance testing gives us a chance to estimate the 
performance of the application under test.
Performance testing gives us a chance to find out the 
application health in terms of its behavior for high 
loads/different load levels/ peak loads etc.

Performance Testing objects:
1. vusers :- test the performance of an application with 
excepted vuser roll.
2. Response time :- identify the response time of each and 
every transaction.
3. utilizations :- define the acceptable criteria of the 
server measurements.
 A) processor  B) memory C) disk

Performance Testing Types:
Load Testing :- gradually ramp up the Vusers to test the 
application scalability from lower level to higher lever. 

Stress testing :- apply all the user roll to perform the 
same functionality at a time. 
Endurance testing :- estimate the scalability or stability 
of application with long duration running.

Benchmark testing :- test the performance of application 
with same load with different configuration.

Performance Measurements:
At the time of performance scenario execution you need to 
measure the performance measurements. 

1. client side measurements.
2. server side measurements.

Client side Measurements:
1. No of Vusers:- it indicates the no of users should 
support by the application simultaneously

2. Transaction Response time:- the amount of time taken by 
the server to process the user actions

3.Transaction per second :- the amount of transaction gone 
through the server per second.
4. Hits per second :- the amount of request made by the 
client to the web server per second.
5. Throughput:- the amount data receive from the web server

Server side Measurements:
1. server side system resources.
		a) processor.
		b) memory 
		c) disk 
		d) server
		

Server side Measurements:
2. server side application resources.
		a) JMS – bytes pending count
			      bytes received count 	
		b) JVM – heap free ( available )
			      heap size ( allocated )	
		c) JTA – transaction committed total count 
			     transaction total count 	


Performance Tuning:
Performance tuning means changing the system 
configurations, change in some settings, change in the 
application etc…., to improve the performance of the 
application.

Identify the exact location of the productional  
bottleneck, you can use performance tuning

Performance Tuning:
1. code level tuning – Developer 
2. data base tuning – DBA
3. network level tuning – network administrator
4. system level tuning – system administrator

Performance Testing Process:
Plan test

         Identification of the business scenarios 

               Work load ( Amount of users)

            Generating & enhancing the script 

Running & monitoring the multi user business scenarios

                Analyze & reporting the records 

                                 Sing off