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  1. #1
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    Performance, Load, Stress Tests

    User praveen (praveen@nous.soft.net) posted:

    Hi all,

    I am relatively new to Web enabled application testing, for that matter even
    client server application testing when it comes to using Load test. I would
    like to ask few questions that may sound to you as elementary, but I need
    them.

    1. Performance Test: What is this test, how we can measure the
    performance of the application, response times etc.
    2. Load Test: What is this test. How can we create/simulate network
    congestion.
    3. Stress Test: What is this Test. How can we determine the resource
    limits that are required to use the application optimally.

    Are the automated tools are absolutely mandatory to perform these tests or
    can we perform them without the automated tools. Please guide me on this.

    Regards,

    Praveen Kumar Chenabatni,
    Sr. Software Consultant
    Nous Infosystems Pvt. Ltd.,
    Bangalore
    Ph: 5534208, 5522086


    ---

  2. #2
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    Re: Performance, Load, Stress Tests

    User Dominic Rogers (DominicR@mercia.com) posted:

    praveen to answer all your questions go to this website its the
    british computer society website for the syllabus for the ISEB
    Certificate in Software testing it will answer all your queries.
    http://www.bcs.org.uk/iseb/syll/st2.htm

    Share and Share alike
    DOM

    Mercia Software Ltd.
    Mercia House
    Ashted Lock
    Aston Science Park
    Birmingham B7 4AZ, UK
    Registered Number: 1868855 (Cardiff)
    Tel: 44 (0)121 359 5096
    Fax: 44 (0)121 359 0375
    Web Site: http://www.mercia.com

    ---

  3. #3
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    Re: Performance, Load, Stress Tests

    User (Paul_Downes@providian.com) posted:


    I append an excerpt from my testing practices document.

    Cheers . . . Paul

    -------------------------------------------------

    Performance testing - exercising a system with large numbers of emulated
    users executing multiple types of transactions in different combinations
    under varied conditions - determines an application's limitations within
    its unique environment. As a best practice, performance testing should be
    an integral part of designing, building, and maintaining applications.
    Testing scalability in the design and construction phases validates that
    the planned architecture will handle expected traffic volumes.

    Performance testing is an overall description for a variety of types of
    testing. These terms are often used interchangeably, and encompass:
    |--------------------+--------------------------------------------------------------|
    | | |
    | | |
    | Test Type | Common Usage Description |
    | | |
    |--------------------+--------------------------------------------------------------|
    | | |
    | | |
    | Load testing | Testing that models the real world usage and transaction |
    | | patterns (number of users, average user interaction times |
    | | and data volumes) of a system over time. |
    | | |
    |--------------------+--------------------------------------------------------------|
    | | |
    | | |
    | Stress testing | Testing conducted to evaluate a system or component at or |
    | | beyond the limits of its specified requirements. |
    | | |
    |--------------------+--------------------------------------------------------------|
    | | |
    | | |
    | Volume testing | Testing where the system is subjected to large volumes of |
    | | transactions for a period. |
    | | |
    |--------------------+--------------------------------------------------------------|
    | | |
    | | |
    | Spike/surge/bounce | Testing alternate high and low volumes to determine how well |
    | testing | the system handles changes in the load. |
    | | |
    |--------------------+--------------------------------------------------------------|
    Our definition of performance testing is: a repeatable methodology for
    simulating real-world load on the production environment, to identify
    performance bottlenecks and break-points that can be remediated prior to
    going live, to ensure service levels of user response and system
    scalability.

    Simply put, performance testing evaluates a system (hardware and software)
    to determine its reliability, scalability, and performance.

    -------------------------------------------------
    ------------------------------------------------------------------------------
    Warning : The information contained in this message may be privileged and confidential and protected from disclosure. If the reader of this message is not the intended recipient, you are hereby notified that any dissemination, distribution or copying of this communication is strictly prohibited. If you have received this communication in error, please notify us immediately by replying to this message and then delete it from your computer. All e-mail sent to this address will be received by the Providian Financial corporate e-mail system and is subject to archiving and review by someone other than the recipient.

    ================================================== ============================


    ---

  4. #4
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    Re: Performance, Load, Stress Tests

    User praveen (praveen@nous.soft.net) posted:

    I have been going through the Rational2000 documentation wherein as a part
    of performing stress test, the following has been written:

    Confirm that the performance of the application does not alter owing to the
    presence of following factors:
    i. When the client/server disk space has been depleted.
    ii. When the client/server Available memory is depleted.
    iii. A dial up connection with a 56K Modem, wherein the bandwidth
    constraints are maximum.

    My question is how to simulate, verify, and infer that the client/server is
    running on low dynamic memory or low disk space.

    Regards,

    Praveen Kumar Chenabatni,
    Sr. Software Consultant
    Nous Infosystems Pvt. Ltd.,
    Bangalore
    Ph: 5534208, 5522086


    ---

  5. #5
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    Re: Performance, Load, Stress Tests

    User Neil Burton (neilburton@tescom.com.sg) posted:

    Install the Rational Agents on the server being tested. These will return
    this information for you, and you can then plot this info against
    performance on a response graph.

    Best Regards

    Neil Burton
    Automation and Tools Specialist
    TesCom Singapore Software Systems Testing

    "The only way to get rid of a temptation is to yield to it. "
    - Oscar Wilde (1854-1900)

    Disclaimer: This communication contains confidential or privileged
    information. If you are not the intended recipient, please notify us
    IMMEDIATELY that you have received it and destroy it. We are not liable
    for any unauthorised sending of or interference with this communication
    TesCom Singapore


    ----- Original Message -----
    From: "praveen" <praveen@nous.soft.net>
    To: "SQA Suite Team Test Users" <sqa-suite-users@lyris.dundee.net>
    Sent: Thursday, November 16, 2000 1:01 PM
    Subject: Stress Tests


    the
    is
    leave-sqa-suite-users-9233366V@lyris.dundee.net


    ---

  6. #6
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    Re: Performance, Load, Stress Tests

    User (david.marsh@gb.abb.com) posted:

    --0__=00256A420037A25B8f9e8a93df938690918c00256A4200 37A25B
    Content-type: text/plain; charset=us-ascii


    i. Disk drives run slower when they get to nearly full, and so your app
    must run slower unless it does not read or write to the disk or use the
    swap file.
    ii. As the available memory is used the swap file is used more often,
    therefore the application will slow down
    iii. When the modem bandwidth constraint is at the maximum no data will
    pass either way, therefore the application will slow down.

    There you go your application just failed on all 3 counts and you didn't
    have to do a stroke of work. PS tell the person who wrote those specs they
    should be written that the performance does not drop below an accepted
    level then define that level. Also they need to specify the amount of
    constraint on the modem.

    Regards

    Dave

    (Embedded "praveen" <praveen@nous.soft.net>
    image moved 16/11/2000 05:01
    to file:
    pic00300.pcx)


    Please respond to "SQA Suite Team Test Users"
    <sqa-suite-users@lyris.dundee.net>

    To: "SQA Suite Team Test Users" <sqa-suite-users@lyris.dundee.net>
    cc:
    Subject: Stress Tests

    Security Level:? Internal


    I have been going through the Rational2000 documentation wherein as a part
    of performing stress test, the following has been written:

    Confirm that the performance of the application does not alter owing to the
    presence of following factors:
    i. When the client/server disk space has been depleted.
    ii. When the client/server Available memory is depleted.
    iii. A dial up connection with a 56K Modem, wherein the bandwidth
    constraints are maximum.

    My question is how to simulate, verify, and infer that the client/server is
    running on low dynamic memory or low disk space.

    Regards,

    Praveen Kumar Chenabatni,
    Sr. Software Consultant
    Nous Infosystems Pvt. Ltd.,
    Bangalore
    Ph: 5534208, 5522086


    ---

  7. #7
    SQA Council
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    Re: Performance, Load, Stress Tests

    User (david.marsh@gb.abb.com) posted:

    --0__=00256A420037A25B8f9e8a93df938690918c00256A4200 37A25B
    Content-type: text/plain; charset=us-ascii


    i. Disk drives run slower when they get to nearly full, and so your app
    must run slower unless it does not read or write to the disk or use the
    swap file.
    ii. As the available memory is used the swap file is used more often,
    therefore the application will slow down
    iii. When the modem bandwidth constraint is at the maximum no data will
    pass either way, therefore the application will slow down.

    There you go your application just failed on all 3 counts and you didn't
    have to do a stroke of work. PS tell the person who wrote those specs they
    should be written that the performance does not drop below an accepted
    level then define that level. Also they need to specify the amount of
    constraint on the modem.

    Regards

    Dave

    (Embedded "praveen" <praveen@nous.soft.net>
    image moved 16/11/2000 05:01
    to file:
    pic00300.pcx)


    Please respond to "SQA Suite Team Test Users"
    <sqa-suite-users@lyris.dundee.net>

    To: "SQA Suite Team Test Users" <sqa-suite-users@lyris.dundee.net>
    cc:
    Subject: Stress Tests

    Security Level:? Internal


    I have been going through the Rational2000 documentation wherein as a part
    of performing stress test, the following has been written:

    Confirm that the performance of the application does not alter owing to the
    presence of following factors:
    i. When the client/server disk space has been depleted.
    ii. When the client/server Available memory is depleted.
    iii. A dial up connection with a 56K Modem, wherein the bandwidth
    constraints are maximum.

    My question is how to simulate, verify, and infer that the client/server is
    running on low dynamic memory or low disk space.

    Regards,

    Praveen Kumar Chenabatni,
    Sr. Software Consultant
    Nous Infosystems Pvt. Ltd.,
    Bangalore
    Ph: 5534208, 5522086


    ---

  8. #8
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    Re: Performance, Load, Stress Tests

    User Schoen, Torsten 3865 PPE-QA1 (Torsten.Schoen@de.heidelberg.com) posted:

    If your server is a NT Box you can specifiy some extra options in the
    boot.ini file to force NT to use less memory. And for the disk space I
    usually just point the applications working directory to a different
    partition that is limited in size. Regarding the connection speed test, we
    have ordered 2 additional internal phone lines and have plugged modems to
    them. 1 maschine is not connected to our local network and we do remote
    testing on that box. But for the time being the remote testing is done
    manually and rather limited, as remote capability are only for maintainance
    and monitoring in our AUT.

    Hope this helps.

    Torsten Schoen
    PPE-QA1
    Heidelberger Druckmaschinen AG
    ---

  9. #9
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    Re: Performance, Load, Stress Tests

    User Crunk John (ext3jpc) (ext3jpc@ups.com) posted:

    There is an application that used to be out some time back (several years)
    called stress that made you your computer think it had less memory and disk
    space among other things. If this is still available, then it may help you.
    I don't know where you can find it, but would like to have it again if you
    come across it. It was an amazing tool.

    John


  10. #10
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    Re: Performance, Load, Stress Tests

    Check out the thread below for discussion of the (disk space/memory) stress utility you refer to, plus pointers at further info:
    http://www.qaforums.com/Forum15/HTML/000468.html

    Automatrix

    ------------------

 

 
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