: Given certain virtual users concurrency some of the "load test steps" can be (and given more or less high load will be) simultaneous. Below is the table of 5 users working in an e-commerce application. Performance: A brief history. Transactions highlighted in Green are completed by the user … While many variables affect accuracy, the number of concurrent virtual users is one of the most important. We could see that each user is in a different transaction denoted by x mark. simultaneous = same action, same time. Why? If you could do that, you would buy a handful of concurrent users — like 500. Translating requests per second into concurrent users. Many companies mistakenly take the total number of sessions and assume it to be the number of concurrent users needed for a load test. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. How do you run a test suite from VS Code? What is the difference between load tests and performance tests? When configuring a test plan for our clients we want to establish a realistic number of concurrent users, in other words, the number of users actually in the system, actively using the application at a given time. The idea behind concurrent user testing is to identify the response time of a website for a specified number of simultaneous users making requests to a website. Most of you probably know the term Concurrent User. Whenever someone asks us how many concurrent users they “should” use in a test to understand their performance baseline and prepare for a big wave of traffic, we like to follow a … When we set rendezvous points we instruct the system to wait till a certain no of vusers arrive so that they all can do a particular task simultaneously. Usually, people get confused with concurrent users and simultaneous users as these both are used interchangeably, but in performance testing these two terms have different meanings. On the other hand simultaneous vusers is more to do with rendezvous points. In load testing, without any time difference when multiple users hit on the same event of an application under the load test is called a concurrent user hit. The goal of load testing is to find problems before they impact users. By "as close as possible" I mean all real user's stuff, i.e. Also, if you calculate the average concurrent sessions between 8 PM and 9 PM on that day when there are more users, the average concurrent sessions are 41.4808. Handling jmeter concurrent users with if statements. Hence, you would have noticed this already. Why do "checked exceptions", i.e., "value-or-error return values", work well in Rust and Go but not in Java? Hence for a web site, the number of simultaneous users would be always greater than the concurrent users.For example , a banking web site has the workload of about 30000 simultaneous users & 5000 concurrent users. Interesting articles that improve the performance of performance testing... Understanding the difference between the Concurrent and Simultaneous users is very much important in generating the type of user load for performance testing. for a span of time. We could see that each user is in a different transaction denoted by x mark. open login page, perform login, navigate somewhere, etc.). For Web page or Web application test each Load Injector can handle approximately up to 25 concurrent users. While designing your load test, look at the right numbers and right time frames. Each of the users would be performing different actions like one doing login , other viewing the reports, etc. Concurrent = users on the system using resources. In the context of load and performance testing, this metric is often claimed the measure of all things, accompanied by the mentioning of astronomically high numbers we can’t really verify and that sometimes are simply used as sales argument for overpriced software products. fly wheels)? If you know the exact meaning of simultaneous and concurrent words then you can easily correlate them with performance testing term. These vusers performing the same task at the same time are called S imultaneous vusers. Simultaneous users are the users who have a valid session in the server. The more realistic your simulation, the more likely you'll catch bottlenecks that lead to a bad user experience. If you don't set any pauses in your tests then 20 concurrent threads will stand for something like 200-250 concurrent users.' Handling embedded resources (images, scripts, styles, fonts included into HTML page), Think time between operations (users don't hammer server non-stop, they need some time to "think" between operations), Load test steps (i.e. And even on Flood, we use it because it's a really good rule of thumb. Of course, this calculation will only help you to estimate the number of concurrent users for a general load on a … Recognizing the difference between total users and concurrent users is key in configuring a realistic and meaningful test plan. Also assuming embedded resources and AJAX requests even single HTTP GET request might cause multiple server hits and the relationship between virtual users and server hits per second is something much more obvious. Concurrent user testing measures how long it takes the server to respond to a specified number of simultaneous requests. Q. Concurrent users are the users who have a valid session in the server & they are performing the … Simultaneous = users executing the same code at the exact same time. In performance testing there should be only one term: virtual user which must represent real user, that's it. I have problem understanding entropy because of some contrary examples, Javascript function to return an array that needs to be in a specific order, depending on the order of a different array. Making statements based on opinion; back them up with references or personal experience. By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy. Given certain virtual users concurrency some of the "load test steps" can be (and given more or less high load will be) simultaneous. These performance tests are very basic tests where there is only single HTTP request (per user). Great graduate courses that went online recently. We could see that all the users are in the same search cart transaction denoted by x mark. Example: Tatkal reservation at IRCTC site Concurrent = operating in same window of time, but each on an independent set of actions. Why do we use approximate in the present and estimated in the past? Hence the users which are running under a test plan; irrespective of the activities they are doing; are called as 'Concurrent Users'. In Europe, can I refuse to use Gsuite / Office365 at work? It helps in identifying and measuring the problems in system parameters such as response time, throughput, deadlock occurrence or any other issues related simultaneously. In Microfocus LoadRunner this is represented by a concept called rendezvous. 18 What is the use of simultaneous users? For HTTP (S) test each Load Injector can handle approximately up to 1000 concurrent HTTP users. First atomic-powered transportation in science fiction. Difference between Concurrent & Simultaneous users in Performance Testing. The best explanation I can offer is that concurrent users are connected to your application and are all requesting work at some regular interval –but not all at once, and not for the same thing. Concurrent user licensing allows firms to purchase computer systems and software at a lower cost because the maximum number of concurrent users expected to use the system or software at any given time (those users all logged in together) is only a portion of the total system users employed at … Why is there no Vice Presidential line of succession? Loadrunner - Replacing a character in a text file... Best Practices for Loadrunner Vugen scripting. Transactions highlighted in Green are completed by the user and in yellow are yet to be started which also remains the same for all users. It is also true that good tools that can test thousands of virtual users cost an arm and a leg. Concurrent Users: The word concurrent is used only for the events that occur over a period of time i.e. In reality, the number of concurrent users derived from the available CPU and CPU cores is more accurate. This article will describe the steps you need to take to easily run a load test with 50k concurrent users test (as well as bigger tests with up to 2 million users). Currently, I have all the test runs automated so that every night, a 10,000 concurrent user test is initiated that runs for approximately 12 hours. Why server CPU usage reaches to 100% with only 25 concurrent users? Session information (total number of sessions, average length of the sessions) is helpful in … "Concurrent users" in performance testing - limitations. Concurrent user testing is also called simultaneous user testing. How does SQL Server process DELETE WHERE EXISTS (SELECT 1 FROM TABLE)? How do airplanes maintain separation over large bodies of water? How to run web performance test for 200 users in VS 2013? Join Stack Overflow to learn, share knowledge, and build your career. Well-behaved load test has to represent real user as close as possible, otherwise it will not make a lot of sense to run such a test. What are the common mistakes done in Performance Testing? How do I Performance test a 3rd party API which has limitations on number of concurrent users? Once done you can set up a Load Test with anticipated amount of concurrent users, let say 10 to determine performance baseline and execute this short smaller test periodically and in automated manner (i.e. Stack Overflow for Teams is a private, secure spot for you and This is not to say that session information is useless. Direct jump to multi-user tests; Test results not validated; Unknown workload details How is the Ogre's greatclub damage constructed in Pathfinder? VB Script to delete a set of files based on file extension, Standard deviation and its importance in performance testing, lr_read_file Loadrunner Function to read the content of a text file, SaveOffset attribute in web_reg_save_param, web_concurrent_start & web_concurrent_end, Loadrunner scripting for Rest API services - web_custom_request, Parameterization in TruClient Protocol Loadrunner - JavaScript Based (Method 2 - LR.getParam), C Program to write loadrunner parameter output to text file, Pacing Calculation in Loadrunner - Performance Testing, Understanding the relationship between hits per second & throughput in performance testing. In the performance testing term, you could say 'a period of time' implies 'test duration'. A load of simultaneous user confirms that the particular page or functionality of the application can handle the desired load or not at a time. To understand the difference, I would suggest to know the meaning of these two words. Simultaneous testing is a type of testing that is performed to identify the defects in a software, system and application when multiple users login to the respective application. Do GFCI outlets require more than standard box volume? So, it’s better to go for a solution where there is a large scale testing of million concurrent users at the HTTP level and using real browsers when the required load is not too much. site design / logo © 2021 Stack Exchange Inc; user contributions licensed under cc by-sa. It is usually calculated with a short time period of 1 to 30 minutes. After outgrowing the popular messaging service it was using, Uber surveyed the market for a messaging platform that could accommodate 70,000 concurrent users sending upwards of 200 messages each second. Ans: Simultaneous users apply the full load at the particular functionality to find out the performance of it. Quick Steps Overview 1. Concurrent Requests is a popular term used in performance testing to represent the load the server needs to handle. Hi there, We are using JMETER 3.2 to do a series of performance tests (stress testing) with a large number of concurrent users (3000, 4000). These are the 2 terms which is often used in Performance Testing. Concurrent Users Concurrent users refer to the users with valid sessions with the server performing the same task at any point in time. Software Performance Testing and Engineering Forums Forums > Performance Testing Process > Performance Testing Practice > SPEForums need your contributions to build up a strong repository of performance engineering resources. Most probably they have the same meaning. Also assuming embedded resources and AJAX requests even single HTTP GET request might cause multiple server hits and the relationship between virtual users and server hits per second is something much more obvious. "Everyone push the enter button in 3, 2, 1, Now!" Difference between Concurrent & Simultaneous users... Below is the table of 5 users working in an e-commerce application. Performance Testing, Simultaneous User, Concurrent Users, Difference between Simultaneous Users and Concurrent Users, Performance Testing Basics, Simultaneous Vs Concurrent I see the explanations are contradictory in the internet. Concurrent users is a common metric that is used to manage capacity, define licenses and to performance test software.The following are illustrative examples of concurrent users. "Hourly Sessions x Average Session Duration (in seconds) / 3,600" is the formula we recommend to get started It’s always good to take the guesswork out of your load testing and test … make it as a part of your continuous integration pipeline) - this way you will get confidence that the new functionality or bug fixes will not cause performance degradation. That means a single user will execute (60/2) = 30 transactions in an hour. It seems like on every new project, there is a need to educate members of the project team on the difference between concurrent users and simultaneous users as it applies to load testing applications. Concurrent users is the total number of people who use a service in a predefined period of time. Why would someone get a credit card with an annual fee? To learn more, see our tips on writing great answers. In the context of load and performance testing, this metric is often claimed the measure of all things, accompanied by the mentioning of astronomically high numbers we can’t really verify and that sometimes are simply used as sales argument for overpriced software products. They are thinking 50 Threads = 50 Users. But can you simulate a larger user load with a small set of virtual users? rev 2021.1.11.38289, Stack Overflow works best with JavaScript enabled, Where developers & technologists share private knowledge with coworkers, Programming & related technical career opportunities, Recruit tech talent & build your employer brand, Reach developers & technologists worldwide, Difference between Simultaneous and Concurrent users, the relationship between virtual users and server hits per second, Podcast 302: Programming in PowerPoint can teach you a few things. What are the earliest inventions to store and release energy (e.g. Asking for help, clarification, or responding to other answers. What is the difference between Simultaneous and Concurrent users which is often used in Performance Testing. Yes, I am in an argument with a client about this fact. How can I randomly replace only a few words (not all) in Microsoft Word? difference between Simultaneous & Concurrent users. Determine concurrent users for a mobile app performance testing. The team over at Uber developed the initial load testing framework for Mattermost. Thanks for contributing an answer to Stack Overflow! your coworkers to find and share information. Concurrent Users: The word concurrent is used only for the events that occur over a period of time i.e. Where people get into trouble is when they confuse concurrent users with simultaneous users, who are all requesting workat the same time for the same thing. On a weekend, the automated test run, also tests using 10,000 concurrent users, but runs for approximaely 60 hours. The answer is “may be” — though most likely yes! This is almost 2x than the monthly average concurrent users. Good or Bad? tl;dr — This post is about using Google Analytics to determine how many concurrent users to specify in your load tests. for a span of time. Knowing the correct figures of simultaneous & concurrent users is very vital in order to perform performance testing of an application. Loadrunner : How to pass a correct correlation value to the request when the ordinal value and total count of correlated parameter is inconsistent? How to extend lines to Bounding Box in QGIS? 'Also JMeter concurrent threads are not "concurrent users" as real-life people do pauses between actions on web pages. What is concurrent user hits in load testing? Most of you probably know the term Concurrent User. In the performance testing term, you would say ‘a period of time’ implies ‘test duration’. Key takeaways. Transactions highlighted in Green are completed by the user and in yellow are yet to be started which also differs from user to user. So to reach 10K transactions, you’d need: (10k/30) = 333 users. 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Terms of service, privacy policy and cookie policy and performance tests load test almost 2x than monthly... Meaningful test plan is only single HTTP request ( per user ) using concurrent users and simultaneous user in performance testing concurrent users for. Post your answer ”, you agree to our terms of service, privacy policy and cookie.. Button in 3, 2, 1, Now! rule of thumb ‘ test ’. ( S ) test each load Injector can handle concurrent users and simultaneous user in performance testing up to 25 concurrent users: the word is! Box volume not `` concurrent users for a mobile app performance testing join Stack Overflow to learn share. To 25 concurrent users. RSS feed, copy and paste this URL into your RSS.! Microsoft word terms which is often used in performance testing there should be only one term: virtual user must! A service in a different transaction denoted by x mark that session is. Why server CPU usage reaches to 100 % with only 25 concurrent users is very vital order! 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The load the server needs to handle a test suite from VS code site on the other hand simultaneous is! Perform performance testing of an application yellow are yet to be the of! Executing the same task at the particular functionality to find and share information a different transaction denoted x... An application load test, look at concurrent users and simultaneous user in performance testing same code at the exact same.... Over large bodies of water am in an argument with a client about this.... Run Web performance test a 3rd party API which has limitations on of! Arm and a leg and concurrent users do with rendezvous points as close possible! Could do that, you ’ d need: ( 10k/30 ) = 30 transactions in an argument a. Code at the exact same time you would buy a handful of concurrent is! Term, you agree to our terms of service, privacy policy and cookie policy run a test suite VS... Is “ may be ” — though most likely yes one term: virtual user which must represent user! = 30 transactions in an hour represent real user 's stuff, i.e needs to handle a.