Load vs Stress testing

Question

What is the difference between load and stress testing

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Load testing   putting a specified amount of load on the server for certain amount of time  100 simultaneous users for 10 minutes  Ensure stability of software  Stress testing   increasing the amount of load steadily until the software crashes  10 simultaneous users increasing every 2 minutes until the server crashes   To make a comparison to weight lifting  You  max  your weight to see what you can do for 1 rep  stress testing  and then on regular workouts you do 85  of your max value for 3 sets of 10 reps  load testing

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Load Testing  Load testing is meant to test the system by constantly and steadily increasing the load on the system till the time it reaches the threshold limit   Example For example  to check the email functionality of an application  it could be flooded with 1000 users at a time  Now  1000 users can fire the email transactions  read  send  delete  forward  reply  in many different ways  If we take one transaction per user per hour  then it would be 1000 transactions per hour  By simulating 10 transactions user  we could load test the email server by occupying it with 10000 transactions hour   Stress Testing  Under stress testing  various activities to overload the existing resources with excess jobs are carried out in an attempt to break the system down   Example  As an example  a word processor like Writer1 1 0 by OpenOffice org is utilized in development of letters  presentations  spread sheets etc    Purpose of our stress testing is to load it with the excess of characters   To do this  we will repeatedly paste a line of data  till it reaches its threshold limit of handling large volume of text  As soon as the character size reaches 65 535 characters  it would simply refuse to accept more data  The result of stress testing on Writer 1 1 0 produces the result that  it does not crash under the stress and that it handle the situation gracefully  which make sure that application is working correctly even under rigorous stress conditions

User · Answer

Load testing  - Load testing is meant to test the system by constantly and steadily increasing the load on the system till the time it reaches the threshold limit   Stress Testing  - Under stress testing  various activities to overload the existing resources with excess jobs are carried out in an attempt to break the system down   The basic difference is as under  click here to see the exact difference

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The terms  stress testing  and  load testing  are often used interchangeably by software test engineers but they are really quite different     Stress testing   In Stress testing we 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   OR  Stress testing is the process of subjecting your program system under test  SUT  to reduced resources and then examining the SUT   s behavior by running standard functional tests  The idea of this is to expose problems that do not appear under normal conditions For example  a multi-threaded program may work fine under normal conditions but under conditions of reduced CPU availability  timing issues will be different and the SUT will crash   The most common types of system resources reduced in stress testing are CPU  internal memory  and external disk space  When performing stress testing  it is common to call the tools which reduce these three resources EatCPU  EatMem  and EatDisk respectively   While on the other hand Load Testing  In case of Load testing Load testing is the process of subjecting your SUT to heavy loads  typically by simulating multiple users  Using Load runner   where  users  can mean human users or virtual programmatic users  The most common example of load testing involves subjecting a Web-based or network-based application to simultaneous hits by thousands of users  This is generally accomplished by a program which simulates the users  There are two main purposes of load testing  to determine performance characteristics of the SUT  and to determine if the SUT  breaks  gracefully or not    In the case of a Web site  you would use load testing to determine how many users your system can handle and still have adequate performance  and to determine what happens with an extreme load     will the Web site generate a  too busy  message for users  or will the Web server crash in flames

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Load Testing  Large amount of users Stress Testing  Too many users  too much data  too little time and too little room

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Wikipedia on load testing  bold is mine            A load test is usually conducted to understand the behaviour of the system under a specific expected load  This load can be the expected concurrent number of users on the application performing a specific number of transactions within the set duration  This test will give out the response times of all the important business critical transactions         and on stress testing      understand the upper limits of capacity within the system  This kind of test is done to determine the system s robustness in terms of extreme load and helps application administrators to determine if the system will perform sufficiently if the current load goes well above the expected maximum    So the bottom line is  if you are testing normal  expected load  you know the system will be used by up to 100 users at a time   this is load testing  But when you want to determine how the system behaves under extreme load  DoS  Slashdot effect  and when it breaks  this is stress testing

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Load - Test S W at max Load  Stress - Beyond the Load of S W Or To determine the breaking point of s w

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-  Testing the app with maximum number of user and input is defined as load testing  While testing the app with more than maximum number of user and input is defined as stress testing   - In Load testing we measure the system performance based on a volume of users  While in Stress testing we measure the breakpoint of a system   - Load Testing is testing the application for a given load requirements which may include any of the following criteria     Total number of users     Response Time    Through Put   Some parameters to check State of servers application   -  While stress testing is testing the application for unexpected load  It includes    Vusers    Think-Time   Example   If an app is build for 500 users  then for load testing we check up to 500 users and for stress testing we check greater than 500

[testing] Load vs. Stress testing

Examples related to testing

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