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Software Testing >> Performance & Load Testing

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josri
Newbie


Reged: 07/17/09
Posts: 4
reliability testing vs. stress testing
      #717784 - 10/09/12 10:17 PM

My understanding is,
Reliability testing is when you have a set # you have promised the customer (in the requirement) and making sure you are able to meet that reliably

Stress testing is when you go beyond the requirement # to meet trying to find a breaking point.

Is that right?

Thank you
Jo


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Devendra_Singh
Member


Reged: 09/20/12
Posts: 27
Loc: India
Re: reliability testing vs. stress testing [Re: josri]
      #717795 - 10/10/12 01:51 AM

Jo,

Stress testing in not always to find breaking point, but graceful degradation of system.Some try to overload and reach breakpoint.
That is going beyond the requirements, in some cases the system behaves so bad that breakpoint is within requirements limit.

Reliability is measure of how often system failures are happening under given conditions.

Thanks,

--------------------
Devendra Singh
http://performancetestingcentre.blogspot.com/


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LoadRunner421
Member


Reged: 05/06/11
Posts: 142
Re: reliability testing vs. stress testing [Re: Devendra_Singh]
      #717817 - 10/10/12 06:45 AM

http://en.wikipedia.org/wiki/Software_Reliability_Testing

http://en.wikipedia.org/wiki/Stress_testing


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saharinivas
Member


Reged: 04/24/08
Posts: 199
Re: reliability testing vs. stress testing [Re: LoadRunner421]
      #717819 - 10/10/12 07:10 AM

Hi Joe,

Link provides good info. Thanks for sharing it.

Regards,
Mahesh


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josri
Newbie


Reged: 07/17/09
Posts: 4
Re: reliability testing vs. stress testing [Re: saharinivas]
      #717829 - 10/10/12 08:40 AM

Thank you for the response.

Yes, I did check those wiki pages already.

I got confused where it says Load testing is a type of Reliability Testing and "This test is conducted to check the performance of the software under maximum work load. Any software performs better up to some extent of load on it after which the response time of the software starts degrading. For example, a web site can be tested to see till how many simultaneous users it can function without performance degradation. "

My understanding is, Reliability testing is only within certain limit which is predefined in the requirement and not to check whether it degrades after certain point.

Thank you
Jo


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LoadRunner421
Member


Reged: 05/06/11
Posts: 142
Re: reliability testing vs. stress testing [Re: josri]
      #717835 - 10/10/12 09:40 AM

I've never heard of reliability testing before but from my understanding:

Stress/Load testing is a type of reliability testing.

Reliability testing is testing the reliability of an application under a certain condition for a certain amount of time. This condition can be many things such as applying heavy load (Stress Test).

So checking whether the system degrades after a certain point is a type of reliability testing in my opinion.


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saharinivas
Member


Reged: 04/24/08
Posts: 199
Re: reliability testing vs. stress testing [Re: LoadRunner421]
      #717836 - 10/10/12 10:00 AM

In simple words, reliability testing is otherwise known as duration test. Here, system is subject with load for prolonged time period.

Main goal of this test is to identify memory block / leak in application.

Regards,
Mahesh


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josri
Newbie


Reged: 07/17/09
Posts: 4
Re: reliability testing vs. stress testing [Re: saharinivas]
      #717860 - 10/10/12 03:21 PM

Thank you Mahesh

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Devendra_Singh
Member


Reged: 09/20/12
Posts: 27
Loc: India
Re: reliability testing vs. stress testing [Re: josri]
      #718215 - 10/17/12 03:04 AM

Mahesh,

I think duration testing is Endurances testing which checks out the memory leaks when we run the test for long duration like 12-16 hours.

How can duration be same as reliability testing when reliability is measured as Mean Time Between Failure (MTBF)?

Thanks,

--------------------
Devendra Singh
http://performancetestingcentre.blogspot.com/


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saharinivas
Member


Reged: 04/24/08
Posts: 199
Re: reliability testing vs. stress testing [Re: Devendra_Singh]
      #718241 - 10/17/12 09:31 AM

Hi Devendra Singh,

Reliability is not measured only by MTBF. It has many goals. To measure MTBF, we have failover test.

To handle different goals, we have different types of test in performance testing

Regards,
Mahesh.S


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Devendra_Singh
Member


Reged: 09/20/12
Posts: 27
Loc: India
Re: reliability testing vs. stress testing [Re: saharinivas]
      #718291 - 10/17/12 10:11 PM

Mahesh,

http://msdn.microsoft.com/en-us/library/aa292168(v=vs.71).aspx

Please visit the above link.

Failover as per my understanding is Used to verify system's ability to continue operations while the processing capability is being transferred to a back-up system.

Explanation is cordially welcome!!!

Thanks,

--------------------
Devendra Singh
http://performancetestingcentre.blogspot.com/


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saharinivas
Member


Reged: 04/24/08
Posts: 199
Re: reliability testing vs. stress testing [Re: Devendra_Singh]
      #718302 - 10/18/12 02:44 AM

Quote:



Failover as per my understanding is Used to verify system's ability to continue operations while the processing capability is being transferred to a back-up system.






Recovery time on being transfering request from primary to secondary server (Back-up) is measured in failover test. This time recovery concept also comes under reliability engineering.

Regards,
Mahesh


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Devendra_Singh
Member


Reged: 09/20/12
Posts: 27
Loc: India
Re: reliability testing vs. stress testing [Re: saharinivas]
      #718350 - 10/18/12 09:22 PM

Quote:


This time recovery concept also comes under reliability engineering.





Agreed. As if system is failing frequently you cant rely on that. Just a diffrent perpective, to be tested.

Quote:


In simple words, reliability testing is otherwise known as duration test. Here, system is subject with load for prolonged time period.

Main goal of this test is to identify memory block / leak in application.






How duration or enduration is same as reliability ?

Regards,

--------------------
Devendra Singh
http://performancetestingcentre.blogspot.com/


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