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Message Icon Topic: Load testing and Stress Testing - Its my knowledge

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dkarthikeyan
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Quote dkarthikeyan Replybullet Topic: Load testing and Stress Testing - Its my knowledge
    Posted: 16Apr2008 at 9:03am

Load testing and Stress Testing

Load testing

Load testing is a much used industry term for the effort of performance testing. Here load means the number of users or the traffic for the system. Load testing is defined as the testing to determine whether the system is capable of handling anticipated number of users or not.

In Load Testing, the virtual users are simulated to exhibit the real user behavior as much as possible. Even the user think time such as how users will take time to think before inputting data will also be emulated. It is carried out to justify whether the system is performing well for the specified limit of load.

For example, Let us say an online-shopping application is anticipating 1000 concurrent user hits at peak period. In addition, the peak period is expected to stay for 12 hrs. Then the system is load tested with 1000 virtual users for 12 hrs. These kinds of tests are carried out in levels: first 1 user, 50 users, and 100 users, 250 users, 500 users and so on till the anticipated limit are reached. The testing effort is closed exactly for 1000 concurrent users.

The objective of load testing is to check whether the system can perform well for specified load. The system may be capable of accommodating more than 1000 concurrent users. But, validating that is not under the scope of load testing. No attempt is made to determine how many more concurrent users the system is capable of servicing. Table 1 illustrates the example specified.

Stress testing

Stress testing is another industry term of performance testing. Though load testing & Stress testing are used synonymously for performance–related efforts, their goal is different.

Unlike load testing where testing is conducted for specified number of users, stress testing is conducted for the number of concurrent users beyond the specified limit. The objective is to identify the maximum number of users the system can handle before breaking down or degrading drastically. Since the aim is to put more stress on system, think time of the user is ignored and the system is exposed to excess load. The goals of load and stress testing are listed in Table 2. Refer to table 3 for the inference drawn through the Performance Testing Efforts.

Let us take the same example of online shopping application to illustrate the objective of stress testing. It determines the maximum number of concurrent users an online system can service which can be beyond 1000 users (specified limit). However, there is a possibility that the maximum load that can be handled by the system may found to be same as the anticipated limit. The Table<##>illustrates the example specified.

Stress testing also determines the behavior of the system as user base increases. It checks whether the system is going to degrade gracefully or crash at a shot when the load goes beyond the specified limit.

                                    Table 1: Load and stress testing of illustrative example

Types of Testing

 

Number of Concurrent users

Duration

Load Testing

1 User à 50 Users à100 Users à250 Users à500 Users…………. à1000Users

12 Hours

Stress Testing

1 User à 50 Users à100 Users à250 Users à500 Users…………. à1000Users àBeyond 1000 Users……….. àMaximum Users

12 Hours

 

Table 2: Goals of load and stress testing

Types of testing

Goals

Load testing

  • Testing for anticipated user base
  • Validates whether system is capable of handling load under specified limit

Stress testing

  • Testing beyond the anticipated user base
  • Identifies the maximum  load a system can handle
  • Checks whether the system degrades gracefully or crashes at a shot

 

Table 3: Inference drawn by load and stress testing

 

Type of Testing

Inference

Load Testing

Whether system Available?

If yes, is the available system is stable?

Stress Testing

Whether system is Available?

If yes, is the available system is stable?

If Yes, is it moving towards Unstable state?

When the system is going to break down or degrade drastically?




Edited by dkarthikeyan - 16Apr2008 at 9:06am



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rumikhan
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Quote rumikhan Replybullet Posted: 29Jul2008 at 2:03am
Hi all,
 
Can any one please tell me any tool for Load and stress testing for Ajax  with flex application
 
Thanks
Rumi
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tossy
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Quote tossy Replybullet Posted: 22Aug2008 at 4:58am

1.Stress testing is subjecting a system to an unreasonable load
while denying it the resources (e.g., RAM, disc, mips, interrupts,
etc.) needed to process that load. The idea is to stress a system to
the breaking point in order to find bugs that will make that break
potentially harmful. The system is not expected to process the
overload without adequate resources, but to behave (e.g., fail) in a
decent manner (e.g., not corrupting or losing data). Bugs and failure
modes discovered under stress testing may or may not be repaired
depending on the application, the failure mode, consequences, etc.
The load (incoming transaction stream) in stress testing is often
deliberately distorted so as to force the system into resource
depletion.

2.Load testing is subjecting a system to a statistically
representative (usually) load. The two main reasons for using such
loads is in support of software reliability testing and in
performance testing. The term "load testing" by itself is too vague
and imprecise to warrant use. For example, do you mean representative
load," "overload," "high load," etc. In performance testing, load is
varied from a minimum (zero) to the maximum level the system can
sustain without running out of resources or having, transactions
suffer (application-specific) excessive delay.





   

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kalai
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Quote kalai Replybullet Posted: 24Jun2009 at 6:07am
LOAD TESTING:

Load testing is the process of subjecting a computer, peripheral, server, network or application to a work level approaching the limits of its specifications. Load testing can be done under controlled lab conditions to compare the capabilities of different systems or to accurately measure the capabilities of a single system.

STRESS 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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