Performance testing ( Approaching , Designing performance tests)

@Copyright-Abhijeet
Patil(abhi.gets.mail@gmail.com)

1. Typical Scenario
2. Performance Testing
3. Scope
4. Before getting started
5. Tool Selection
6. Requirement Freezing
7. How to design Test cases
8. Benchmarking [test data / Hardware]
9. Execution [Types of performance test]
10.Life Cycle of performance testing
11.Jenkins/Results
12.Hardware Scaling
13.Real World Case Studies
Agenda
@Copyright-Abhijeet

www.abc.com
Typical Scenario
Server
@Copyright-Abhijeet

Adam : Performance tester
John : Adam’s friend
John : “Awesome Adam. That mean we would
know the impact on server when there are tons
of user accessing our site”
Adam : Exactly you got that right.
@Copyright-Abhijeet

John : “So if you say the response time is 3 sec
for 100 users that mean when I access the site I
will see that page in 3 sec”
Adam : Wait wait wait !!!! Hold on, don’t
conclude that so easily. Let understand few
more thing before that.
Lets see our next slide
@Copyright-Abhijeet

Adam : “John there are following things
• Network latency
• Server processing time
• Browser Rendering
John : “Btw can you give more insight to it”
Adam : “Sure. Lets see our next slide ”
@Copyright-Abhijeet

Adam : Lets take an example of www.google.com . And
understand few basic things
Server
<html>
<head>Google</head>
<body>
Result found…..
</body>
</html>
@Copyright-Abhijeet

Performance testing
• Traditionally referred to as server side
performance testing
• But now a days client side performance
testing has also gained importance
• Heavy Java Scripting.
• CSS 3 & HTML5 empowering browsers.
• Browser getting more and more smarter in rendering
pages and increasing user experience
• Ideally
Performance testing = Server Side + Client Side
@Copyright-Abhijeet

Scope
• Only serve side performance testing
• Journey from the moment GET request is sent till
HTTP Response is received
• Network latency + Server processing time
• Will talk mostly about how to approach
performance testing activity
• If time permits talk about JMeter
@Copyright-Abhijeet

Before getting started
• Know the business cases: This will help you in
designing the test scenarios
• The type of application : Web , Web Service
• Audience that will be using : LAN , Intranet
, Internet, Internet but public site
• ***Explore your application with some
packet capturing tool. e.g. Fiddler , Paros
i.e. Study your application in-depth
@Copyright-Abhijeet

Tool Selection
• JMeter (Open Source)
• OpenSTA (Open Source)
• Load Runner (Commercial)
• Silk Performer (Commercial)
• VSTS - Web Test (Commercial)
• LoadUI (Commercial)
•
• Many More . . . . . .
@Copyright-Abhijeet

John : “So now i have understanding of
business scenarios also we decided upon tool.
So what’s next”
Adam : “Now most important part of
performance test. Capturing the Test
Requirements.
It will serve as input to test plan“
@Copyright-Abhijeet

• Ask few question to business
• What are the concurrent user(session active) we are expecting
our application to handle?
• What are the active user(doing some action) we expect our
application should handle?
• What would be the peak load (maximum)on our application ?
• What would be the peak time(s) (timestamp/timestamps) we
expect our application will get max load ?
• What would be the response time we are expecting our
application should serve ?
• How long we expected our application to work without any
failures ?
• And if failure occur what is the acceptable failure rate ?
• How frequently will the web server restart ?
Requirement Gathering
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How to design test case
• Identify real world business scenarios, always
give priority to them
• Use power of Randomize
• Don't forget think time
Lets look at the PMRW script
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• Now look for your real time test data. Make
it your benchmark
• Best practice is to keep same test data for
each execution.
• Automate your pre-requisite
o Write db scripts.
• After execution bring back the system to it
previous state. Post-requsite
o Clean up activities
Test-Data Benchmarking
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Hardware Benchmarking
• Now decide upon hardware against which
you want to do performance testing
o Server Configuration [Processors/RAM/etc.]
o OS
o Software (e.g. tomcat, java, etc.)
o DataBase (version)
o If clustered environment (number of nodes,
they way load balancer is configured)
• i.e Overall all configuration of system
@Copyright-Abhijeet

Execution/Type of tests
• For various test types
• Endurance (time)
• Step-up Load (user load)
• Spike Load (user, time)
• Monitor Server : cpu, memory
• Strategy that can be used for each above type
• What load : e.g. Endurance test for various loads
(e.g. 50 , 75 , 150 , 350 , 600 , 900 ,etc.)
• Duration : various time duration (e.g. 6hrs ,
18 hrs , 24hrs , 30 hrs , etc )@Copyright-Abhijeet

Execution (contd...)
• Distributed load
• Number of nodes
• Load on each node
Lets talk more about in one of the upcoming
slide
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Setup Hardware
Setup Test Data
Run Test
Publish Results
Mark as new
BenchMark
next Iteration
Finish
No
Ye
sReason for Iteration
• New Release
• Hardware Change
• Configuration change
Results unacceptable [first iteration]
Or
Performance Deterioration [benchmark]
Yes
Performance Improvement/
Tuning/
Server monitoringOnly one at a time
No
i.e if performance
improvement
Life Cycle@Copyright-Abhijeet

Jenkins
• Helped a lot in current project
• Its helps automating end to end performance
test. We can schedule it for over night run
• There is a Jenkins plug-in that parses the
Jmeter results
• We can always archive results
• Anyone can trigger the test without
knowledge of Jmeter.
Let go and checkout our Jenkins@Copyright-Abhijeet

Result
• Lets look at Jenkins for results
• http://Jenkins/job/PerformanceTestingOnRef/15
0/performance/?
• http://Jenkins/job/PerformanceTestingOnRef/13
9/performance/?
• You can create your own graphs using tools
like MS Excel i.e. extract whatever data you
want
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• If you would be scaling
o Ram
o Processor
o Node
• Find the factor 'X' which will be used to
predict the performance of application if we
scale the hardware
• Required incase if you don't want to do
performance tuning .
Hardware Scaling
@Copyright-Abhijeet

Some Real World Case Studies
• V3 : “Aakho ka dhoka”
• Current Project & V2: Registration Looping
• Pre-Requisite to automation
• User Registration
• Deletion of User
• To test integration points [api’s]
@Copyright-Abhijeet

JMeter
• How to run test from JMeter
o GUI
o Command line arguments
o Distributed load generation
• How to create scripts
o Recording using Jmeter proxy / Manually create
o Extract Dynamic data and send in next request
o Parameterized common things i.e server name ,
port , some test data e.g lat, lon
o Configuring test externally from command line
@Copyright-Abhijeet

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