Performance
Testing:
Performance testing is the process of determining the responsiveness
or effectiveness or scalability and stability of software or device to determine how the components of a system
are performing with given a particular state.
It can also serve to investigate, measure, validate or verify
other quality attributes of
the system, such as scalability, reliability and
resource usage.
It includes: Load Testing, Stress Testing, capacity testing,
volume testing, endurance testing, spike testing, scalability testing and
reliability testing etc.
This type of testing does not give pass or fail result, it
performed to get benchmark & standard of the application against
Concurrency / Throughput, Server response time, Latency, Render response time
etc. for responsiveness, speed, scalability and stability characteristics.
Load Runner has 4 key
components
1. Virtual User Generator (VUGEN)
VUGEN is used for
generating and editing scripts
It has four components
1)
Record
2)
Run
3)
Debug
4)
Design
2. Controller
Controller is where we
apply the load. The Controller systematizes drives, manages and monitors the
load test.
3. Load Generator
Load Generate is local CPU
which generates the load by running virtual users
4. Analysis
Analysis accumulates logs
from various load generators and present reports for visualization of run
result data & monitoring data
Load Runners shows error
details as below.
1) Syntax error: [ , ; : “ ) ] etc.
2) Runtime error: Spelling error.
3) Compiling error:
Advance Components
·
Parameterization
Replacing
the recorded value with a script value.The value that you are replacing has to
be in the database
Parameterization helps
1.
Reducing
script size
2.
Avoiding cache
effect
·
Correlation
Using
“Correlation” we can capture the dynamically generated value from the server
using nested queries.
·
Load Balancing
How to
increase/decrease the load
·
Think time
Think
time is the time that a real user waits/
pause between actions.
·
Rendezvous Point
Rendezvous
Points means “meeting points”. This option used to check the peak load from off
peak load. Virtual users instructed/configured to wait during test execution
for multiple Vusers to arrive at a certain point before execution
