1) Explain what is JMeter?
JMeter is a JAVA tool,
which is used for performance load testing.
2) Explain how JMeter works?
JMeter acts like a group of
users sending requests to a target server. It collects response from target
server and other statistics which show the performance of the application or
server via graphs or tables.
3) Explain where you can use functions and variables?
Variables and functions can
be written into any field of any test component
4) Mention what are regular expressions in JMeter?
Based on the pattern,
regular expression are used to search and manipulate text. JMeter is useful in
interpreting forms of regular expression or patterns being used throughout a
JMeter test plan.
5) Explain what is Samplers and Thread groups?
·
Thread
group: For any test plan, JMeter is the beginning part of thread group
elements. It is an important element of JMeter, where you can set number of
users and time to load all the users given in the thread group
·
Samplers:
Sampler generates one or more sample results; these sample results have many
attributes like elapsed time, data size, etc. Samplers allow JMeter to send
specific types of requests to the server, through samplers, thread group
decides which type of request it need to make. Some of the useful samplers are
HTTP request, FTP request, JDBC request and so on.
![JMeter](file:///C:\Users\RKUDIK~1\AppData\Local\Temp\msohtmlclip1\01\clip_image001.png)
6) Whether the test plans built using JMeter are OS dependent?
Usually, test plan are
saved in their XML format, so there is nothing to do with any particular O.S.
It can be run on any OS where JMeter can run.
7) Mention what are the types of processor in JMeter?
The types of processor in
JMeter are
·
Pre-processor
·
Post
processor
8) Explain what are Pre-processor Elements? List some of the
pre-processor elements?
A pre-processor is
something that will happen before sampler executes. To configure the sample
request prior to its execution or to update variables that are not extracted
from response text pre-processor elements are used.
Some of the pre-processor
elements are
·
HTTP
URL re-writing modifier
·
HTTP
user parameter modifier
·
HTML
link parser
·
BeanShell
PreProcessor
9) Mention the execution order of Test Elements?
The test plans elements
execution order is
·
Configuration
elements
·
Pre-processors
·
Timers
·
Samplers
·
Post-processors
·
Assertions
·
Listeners
10) What does “contain” and “matches” indicates in the regular
expression?
In the regular expression,
contains indicates that the regular expression matched at least some part of
the target. While matches means the regular expression matched the whole
target. So, ‘alphabet’ is “matched” by ‘al.*t.’
11) Explain what is configuration elements?
A configuration element
works parallel with a Sampler. To set up defaults and variables for later use
by samplers configuration elements can be used. At the start of the scope,
these elements are processed before any samplers in the same scope.
12) Explain what is a timer in JMeter and what are the types of
it?
A JMeter thread by default
will send requests continuously without any pause. To get a pause between the
request, Timers are used. Some of the Timers used are Constant Timer, Gaussian
Random Timer, Synchronizing Timer, Uniform Random Timer and so on.
13) Explain what is Test Fragment?
Test fragment is also a
type of element like Thread Group element. The only difference is test fragment
is not implemented unless it is referenced by either a Module controller or an
Include controller.
14) Explain what is Assertion in JMeter? What are the types of
assertion?
Assertion helps to verify
that your server under test returns the expected results
Some commonly used
Assertion in JMeter are
·
Response
Assertion
·
Duration
Assertion
·
Size
Assertion
·
XML
Assertion
·
HTML
Assertion
15) Explain how you can reduce the resource requirement in JMeter?
To reduce the resource
requirements in JMeter
·
Use
non-GUI mode: jmeter –n –t test.jmx –l test.jtl
·
During
the load, test doesn’t use “view results tree” or “view results in table”
listeners, use them only during scripting phase
·
Don’t
use functional mode
·
Instead
of using lots of similar samplers, use the same sampler in loop and use
variable to vary the sample
16) Explain how you can perform spike testing in JMeter?
By synchronizing, timer
JMeter spike testing can be achieved. Synchronizing timer, blocks thread until
a specific amount of threads has been blocked and then release them all
together thus creating large instantaneous load.
17) Explain how you can capture the script of the authentication
window in JMeter?
Normally, you can capture
script by recording.
·
First
you have to Threadgroup in Testplan and then make HTTPProxyServer in Workbench
·
After
that, set port number in Global Setting box (e.g., 8911) and modify your
connection setting in IE as local host in address 8911 as in port
Then you can start http proxy server in JMeter and run your application for login
Then you can start http proxy server in JMeter and run your application for login
18) List out few JMeter Listeners?
Some of the JMeter
Listeners are
·
Spline
Visualizer
·
Aggregate
Report
·
View
Result Tree
·
View
Result in Table
·
Monitor
Results
·
Distribution
Graph
·
BeanShell
Listener
·
Summary
Report and so on
19) What is distributed load testing? How it can be achieved?
Distributed load testing is
the process through which numerous systems can be used for simulating load of a
large number of users. By using the master-slave configuration, JMeter can do
distribute load testing.
20) In JMeter is it necessary to call embedded resources
explicitly?
You can eliminate all
embedded resources from being explicitly called. Requests have a checkbox at
the bottom that says “retrieve embedded resources.” It would grab all CSS, JPG,
etc. It is a brilliant way to find resources and broken link in a web App.
21) Explain what is the role of Timer in JMeter?
With the help of timer,
JMeter can delay the time between each request, which a thread makes. It can
solve the overload problem of the server.
22) Explain what is Post-processor?
To perform any action after
making a request, Post- processor is used. For example, if JMeter sends an http
request to the web server, and if you want JMeter to stop sending the request
if the web server shows an error, then you will use post-processor to perform
this action.
23) What are the benefits that JMeter offers for performance
testing?
JMeter offers benefits on
performance testing like
·
It
can be used to test performance for both, static resources as well as dynamic
resources
·
It
can handle a maximum number of concurrent users then your website can handle
·
It
provides the graphical analyses of performance reports
No comments:
Post a Comment