what is the difference between Performance,Load ,Stress testing

what is the difference between Performance,Load ,Stress
testing

Question Posted / sudinder.raju

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what is the difference between Performance,Load ,Stress testing..

Answer / sj1234

Performance testing verifies loads, volume and response
time as defined by requirements

while load testing is testing an application under heavy
loads to determine at what point the system response time
degrades.

Stress testing - Verifies the acceptability of the target-
of-test's performance behavior when abnormal or extreme
conditions are encountered, such as diminished resources or
extremely high number of users.

Briefly:

Performance testing is the overall process,
Load testing checks that the system will support the
expected conditions,
Stress testing tries to break it

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what is the difference between Performance,Load ,Stress testing..

Answer / sachin arora

The goal of performance testing is not to find bugs, but to
eliminate bottlenecks and establish a baseline for future
regression testing.

A clearly defined set of expectations is essential for
meaningful performance testing.

Once you know where you want to be, you can start on your
way there by constantly increasing the load on the system
while looking for bottlenecks.

Load Testing usually defined as the process of exercising
the system under test by feeding it the largest tasks it
can operate with. Load testing is sometimes called volume
testing, or longevity/endurance testing.

Stress testing tries to break the system under test by
overwhelming its resources or by taking resources away from
it (in which case it is sometimes called negative testing).
The main purpose behind this madness is to make sure that
the system fails and recovers gracefully -- this quality is
known as recoverability.

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