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Performance testing &nbsp;is a testing technique that determines the speed, scalability, and stability of an application under a given workload. It helps to ensure the quality of the software.
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<img src="https://lh5.googleusercontent.com/B4uTVmf_1abI9WTT9uud5_diKNy-0tXMNvu4VcxZU_JwzIT5VjL71knduLUbYKj_nkmMkC56JOsx0CXFX97pTk0SGhZLFS0c9eQxApSjj73QTupXF20jD-Ze_iupOsG2rVRZqxYbT8RAq_zKP7qiNQ" width="602" height="276">
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Why do we Need Performance Testing?
To ensure that the system will meet the expected service levels in production as well as to render a positive user experience, it is critical to undertake performance testing. Also, to avoid the cost of solving a problem in production performance that can be prohibitive, a continuous or an ongoing performance testing strategy is advisable. More specifically, performance testing is important:
To verify if the application satisfies performance requirements( for example, the system needs to manage up to 500 or 800 concurrent users)
To check for computing bottlenecks in an application
To compare systems in order to identify the better system of the lot
To measure stability under peak internet traffic events
<img src="https://lh5.googleusercontent.com/YTnqn1_UMx1URz7rUADDRP04Todaj7nB65IPP3T-nbHZxYhZIPoRqdMI7kSaAafHo_k466-aqMJOY3cC6c9x6katgRrw4Rmmk7ZJcDTqkuCmaPV8h80oGccwHkIiGdErBgrlsiPmAdvo5WsomeapTA" width="575" height="175">
<h2 dir="ltr">Types of Performance Testing:</h2>
Capacity Testing
Load Testing
Volume Testing
Stress Testing
Soak Testing
<img src="https://lh6.googleusercontent.com/EetgR5Zlu_TwkXj52ocC55aQsfSYheRaDAL8zDd23pb_KJQTl26R9SxanHmk2ALsioHgmghJpQ7GlpaeqGLlJ-HzSTed_y-at3o8z-VmzhT5aqQrqdBOEQ2VS92Z8uX17gHAyXyp4tqf3AyYC3pr7Q" width="602" height="331">
 
<h3 dir="ltr">Capacity Testing:</h3>
Capacity Testing is to determine how many users the system/application can handle successfully before the performance goals become unacceptable. This allows us to avoid the potential problems in future such as increased user base or increased volume of data.
<h3 dir="ltr">Load Testing:</h3>
Load Testing is to verify that the system/application can handle the expected number of transactions and to verify the system/application behaviour under both normal and peak load conditions (no. of users).
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<h3 dir="ltr">Volume Testing:</h3>
Volume Testing is to verify that the system/application can handle a large amount of data. This testing focuses on Data Base.
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<h3 dir="ltr">Stress Testing:</h3>
Stress Testing is to verify the behavior of the system once the load increases more than the system&rsquo;s design expectations. This testing addresses which components fail first when we stress the system by applying the load beyond the design expectations. So that we can design a more robust system.
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<h3 dir="ltr">Soak Testing:</h3>
Soak Testing is aka Endurance Testing. Running a system at high load for a prolonged period of time to identify the performance problems is called Soak Testing. It is to make sure the software can handle the expected load over a long period of time.
 
<h2 dir="ltr">The Performance Testing Process</h2>
The goal of performance testing is the same for every software, though the methodology can vary a bit. So, here&rsquo;s what a typical performance testing process looks like:
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Choosing the testing environment: First, select your test environment, performance testing tools, and production environment. Select appropriate software, hardware, <a href="https://kinsta.com/blog/google-cloud-network/">network</a> configuration, etc., to use for your test.
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Identifying performance metrics: Next, identify software performance metrics such as response time, throughput, transactions, load time, and resource distribution like CPU, memory, and disk space.
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Planning the test: Identify test scenarios covering user variability, target metrics, and test data. It will help you plan and design a few models of your performance tests.
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Configuring the chosen test environment: Organize the elements of your test environment in addition to the performance testing tools you need for different test cases. For example, to test your website&rsquo;s performance, performance testing tools such as <a href="https://kinsta.com/blog/membership-website-speed/">Kinsta APM</a> can help.
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Implementing the test design: Create your performance test depending upon your test design, which will help your team stay on track during the entire testing process instead of getting confused.
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Executing performance testing: Now, you can start the test. As it runs, monitor the trial and collect the resulting data so your developers can use it to improve the software performance.
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Analyze, report, and retest: After you have the test results in hand, analyze the data and plan what you need to overcome the highlighted issues. Lastly, troubleshoot the problems and execute the performance testing again to track the improvements. Keep retesting until you troubleshoot all of the problems detected.
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<h2 dir="ltr">Top 27 Performance Testing Tools</h2>
We&rsquo;ve collected the best performance testing tools available on the market to help you decide which could work for your unique testing requirements
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<a href="https://kinsta.com/blog/performance-testing-tools/#1-kinsta-apm">Kinsta APM</a>
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<a href="https://kinsta.com/blog/performance-testing-tools/#2-webload">WebLOAD</a>
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<a href="https://kinsta.com/blog/performance-testing-tools/#3-apache-jmeter">Apache JMeter</a>
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<a href="https://kinsta.com/blog/performance-testing-tools/#4-loadninja">LoadNinja</a>
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<a href="https://kinsta.com/blog/performance-testing-tools/#5-loadero">Loadero</a>
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<a href="https://kinsta.com/blog/performance-testing-tools/#6-smartmeterio">SmartMeter.io</a>
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<a href="https://kinsta.com/blog/performance-testing-tools/#7-stormforge">StormForge</a>
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<a href="https://kinsta.com/blog/performance-testing-tools/#8-loadview">LoadView</a>
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<a href="https://kinsta.com/blog/performance-testing-tools/#9-neoload">NeoLoad</a>
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<a href="https://kinsta.com/blog/performance-testing-tools/#10-loadui-pro">LoadUI Pro</a>
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<a href="https://kinsta.com/blog/performance-testing-tools/#11-silk-performer">Silk Performer</a>
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<a href="https://kinsta.com/blog/performance-testing-tools/#12-apploader">AppLoader</a>
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<a href="https://kinsta.com/blog/performance-testing-tools/#13-gatling">Gatling</a>
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<a href="https://kinsta.com/blog/performance-testing-tools/#14-blazemeter">BlazeMeter</a>
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<a href="https://kinsta.com/blog/performance-testing-tools/#15-rational-performance-tester">Rational Performance Tester</a>
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<a href="https://kinsta.com/blog/performance-testing-tools/#16-k6">k6</a>
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<a href="https://kinsta.com/blog/performance-testing-tools/#17-eggplant">Eggplant</a>
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<a href="https://kinsta.com/blog/performance-testing-tools/#18-loadster">Loadster</a>
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<a href="https://kinsta.com/blog/performance-testing-tools/#19-akamai-cloudtest">Akamai CloudTest</a>
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<a href="https://kinsta.com/blog/performance-testing-tools/#20-parasoft-load-test">Parasoft Load Test</a>
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<a href="https://kinsta.com/blog/performance-testing-tools/#21-locust">Locust</a>
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<a href="https://kinsta.com/blog/performance-testing-tools/#22-ngrinder">nGrinder</a>
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<a href="https://kinsta.com/blog/performance-testing-tools/#23-loaderio">Loader.io</a>
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<a href="https://kinsta.com/blog/performance-testing-tools/#24-loadstorm">LoadStorm</a>
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<a href="https://kinsta.com/blog/performance-testing-tools/#25-solarwinds">SolarWinds</a>
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<a href="https://kinsta.com/blog/performance-testing-tools/#26-test-studio">Test Studio</a>
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<a href="https://kinsta.com/blog/performance-testing-tools/#27-taurus">Taurus</a>
</li>
</ol>
the most used and common is Apache JMeter helps you measure and analyze software performance. It&rsquo;s an open source tool based on Java that people use mainly for testing web app performance, but it also finds usage on other services.
<img src="https://lh5.googleusercontent.com/rJhAv_hD9lOjepXhhErACXxGuqCsfkPLRDmDvSFrj-J7lIXodyy5vZe4s3GQWqJR9qIbLFiGdaN-k0y7rS1EHiOROjA6tPxKxuAQZqAxy1eDwRCamzEHzTLI_jFslj4YJeZCs8ZVUeLuCiSa9y3pzQ" width="602" height="187">

Performance testing  is a testing technique that determines the speed, scalability, and stability of an application.

Performance testing

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Importance of Software Testing
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Software testing is an essential part of the software development process. It involves the evaluation of software products and applications to ensure they meet the required standards, specifications, and business requirements. The importance of software testing cannot be overemphasized. It is crucial for ensuring the quality, reliability, and effectiveness of software products.
&nbsp;
&nbsp;Software testing helps to identify defects or bugs in the software, ensuring that they are detected and resolved before the software is released to end-users. This reduces the risk of costly rework and reputational damage caused by software issues that could have been identified and fixed during the testing phase.
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&nbsp;Furthermore, software testing is essential for ensuring the security of software products. Software that has not been adequately tested for security vulnerabilities is at risk of being exploited by hackers or cybercriminals. This can lead to severe consequences, including data breaches, theft of sensitive information, and financial losses.
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&nbsp;Software testing also helps to ensure that software products are user-friendly and meet the needs of the end-users. It is essential to ensure that software is tested with real-world scenarios and user feedback, to ensure it is intuitive, easy to use, and meets the needs of the target audience.
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&nbsp;In addition, software testing is critical for ensuring compliance with regulatory requirements, industry standards, and best practices. Many industries, including healthcare, finance, and aviation, have strict regulations and standards that must be met to ensure the safety and well-being of consumers. Testing software to ensure compliance with these standards is essential to avoid legal and financial penalties.
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Finally, software testing is essential for maintaining the reputation and brand of a company. Software issues can lead to negative publicity and damage the reputation of the company. In contrast, high-quality software that meets the needs of the target audience can increase customer satisfaction and loyalty. In conclusion, software testing is essential for ensuring the quality, reliability, and security of software products. It helps to identify defects, ensure compliance with regulatory requirements and industry standards, and maintain the reputation and brand of a company. Software testing is not just an optional step in the software development process; it is an essential part of creating high-quality software that meets the needs of end-users and delivers value to the business.
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Software testing is an essential part of the software development process.

Importance of Software Testing

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Agile Software Development
 In 2001, a group of individuals, representing the most widely used lightweight software development methodologies, agreed on a common set of values and principles which became known as the Manifesto for Agile Software Development or the Agile Manifesto [Agilemanifesto]. The Agile Manifesto contains four statements of values:
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&nbsp;Individuals and interactions over processes and tools&nbsp;
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&nbsp;Working software over comprehensive documentation&nbsp;
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&nbsp;Customer collaboration over contract negotiation
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&nbsp;&nbsp;Responding to change by following a plan&nbsp;
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 Agile Manifesto values
 
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&nbsp;Our highest priority is to satisfy the customer through early and continuous delivery of valuable software.&nbsp;
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&nbsp;Welcome changing requirements, even late in development. Agile processes harness change for the customer's competitive advantage.&nbsp;
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&nbsp;Deliver working software frequently, at intervals of between a few weeks to a few months, with a preference to the shorter timescale.&nbsp;&nbsp;
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Business people and developers must work together daily throughout the project.&nbsp;
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&nbsp;Build projects around motivated individuals. Give them the environment and support they need, and trust them to get the job done.&nbsp;&nbsp;
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The most efficient and effective method of conveying information to and within a development team is face-to-face conversation.&nbsp;
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&nbsp;Working software is the primary measure of progress.&nbsp;
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&nbsp;Agile processes promote sustainable development. The sponsors, developers, and users should be able to maintain a constant pace indefinitely.&nbsp;&nbsp;
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Continuous attention to technical excellence and good design enhances agility.&nbsp; Simplicity&mdash;the art of maximizing the amount of work not done&mdash;is essential.&nbsp;
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&nbsp;The best architectures, requirements, and designs emerge from self-organizing teams.&nbsp;
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&nbsp;At regular intervals, the team reflects on how to become more effective, then tunes and adjusts its behavior accordingly 
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The different Agile methodologies provide prescriptive practices to put these values and principles into action 
&nbsp;&nbsp;Whole-Team Approach 
The whole-team approach means involving everyone with the knowledge and skills necessary to ensure project success. The team includes representatives from the customer and other business stakeholders who determine product features. The team should be relatively small; successful teams have been observed with as few as three people and as many as nine. Its benefits include:&nbsp;
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Enhancing communication and collaboration within the team&nbsp;&nbsp;
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Enabling the various skill sets within the team&nbsp;&nbsp;
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Making quality everyone&rsquo;s responsibility
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Early and Frequent Feedback 
When sequential development approaches are used, the customer often does not see the product until the project is nearly completed. At that point, it is often too late for the development team to effectively address any issues the customer may have. By getting frequent customer feedback as the project progresses, Agile teams can incorporate most new changes into the product development process. Early and frequent feedback helps the team focus on the features with the highest business value, or associated risk, and these are delivered to the customer first
The benefits of early and frequent feedback include:
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&nbsp;Avoiding requirements misunderstandings, which may not have been detected until later in the development cycle when they are more expensive to fix.&nbsp; Clarifying customer feature requests, making them available for customer use early. This way, the product better reflects what the customer wants.&nbsp;
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Discovering (via continuous integration), isolating, and resolving quality problems early.&nbsp;&nbsp;
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Providing information to the Agile team regarding its productivity and ability to deliver.&nbsp;&nbsp;
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Promoting consistent project momentum
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Agile Software Development & 
 Agile Manifesto values.



Agile Software Development

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