for a span of time. Why do "checked exceptions", i.e., "value-or-error return values", work well in Rust and Go but not in Java? 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. In performance testing there should be only one term: virtual user which must represent real user, that's it. 18 What is the use of simultaneous users? Direct jump to multi-user tests; Test results not validated; Unknown workload details Concurrent = users on the system using resources. Hence, you would have noticed this already. 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. 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. Yes, I am in an argument with a client about this fact. 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. tl;dr — This post is about using Google Analytics to determine how many concurrent users to specify in your load tests. "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 … 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. 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). Concurrent Users: The word concurrent is used only for the events that occur over a period of time i.e. Why do we use approximate in the present and estimated in the past? Concurrent Users: The word concurrent is used only for the events that occur over a period of time i.e. Handling jmeter concurrent users with if statements. 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. "Concurrent users" in performance testing - limitations. "Everyone push the enter button in 3, 2, 1, Now!" The answer is “may be” — though most likely yes! Concurrent user testing measures how long it takes the server to respond to a specified number of simultaneous requests. Why is there no Vice Presidential line of succession? If you don't set any pauses in your tests then 20 concurrent threads will stand for something like 200-250 concurrent users.' fly wheels)? 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. How do I Performance test a 3rd party API which has limitations on number of concurrent users? 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 … What is concurrent user hits in load testing? your coworkers to find and share information. To understand the difference, I would suggest to know the meaning of these two words. It is also true that good tools that can test thousands of virtual users cost an arm and a leg. 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. That means a single user will execute (60/2) = 30 transactions in an hour. 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). The more realistic your simulation, the more likely you'll catch bottlenecks that lead to a bad user experience. How to run web performance test for 200 users in VS 2013? Knowing the correct figures of simultaneous & concurrent users is very vital in order to perform performance testing of an application. 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. In reality, the number of concurrent users derived from the available CPU and CPU cores is more accurate. In Europe, can I refuse to use Gsuite / Office365 at work? site design / logo © 2021 Stack Exchange Inc; user contributions licensed under cc by-sa. Why would someone get a credit card with an annual fee? Transactions highlighted in Green are completed by the user … Simultaneous = users executing the same code at the exact same time. These performance tests are very basic tests where there is only single HTTP request (per user). Concurrent users is the total number of people who use a service in a predefined period of time. Do GFCI outlets require more than standard box volume? 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 … The goal of load testing is to find problems before they impact users. difference between Simultaneous & Concurrent users. How do you run a test suite from VS Code? I see the explanations are contradictory in the internet. Of course, this calculation will only help you to estimate the number of concurrent users for a general load on a … 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. How do airplanes maintain separation over large bodies of water? 'Also JMeter concurrent threads are not "concurrent users" as real-life people do pauses between actions on web pages. In Microfocus LoadRunner this is represented by a concept called rendezvous. simultaneous = same action, same time. How does SQL Server process DELETE WHERE EXISTS (SELECT 1 FROM TABLE)? 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. Example: Tatkal reservation at IRCTC site 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. Most of you probably know the term Concurrent User. 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. But can you simulate a larger user load with a small set of virtual users? Join Stack Overflow to learn, share knowledge, and build your career. Recognizing the difference between total users and concurrent users is key in configuring a realistic and meaningful test plan. 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. Hence the users which are running under a test plan; irrespective of the activities they are doing; are called as 'Concurrent Users'. Quick Steps Overview 1. Performance Testing, Simultaneous User, Concurrent Users, Difference between Simultaneous Users and Concurrent Users, Performance Testing Basics, Simultaneous Vs Concurrent 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. 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. Asking for help, clarification, or responding to other answers. Loadrunner - Replacing a character in a text file... Best Practices for Loadrunner Vugen scripting. 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. So to reach 10K transactions, you’d need: (10k/30) = 333 users. While designing your load test, look at the right numbers and right time frames. Translating requests per second into concurrent users. Ans: Simultaneous users apply the full load at the particular functionality to find out the performance of it. It helps in identifying and measuring the problems in system parameters such as response time, throughput, deadlock occurrence or any other issues related simultaneously. Making statements based on opinion; back them up with references or personal experience. 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. On a weekend, the automated test run, also tests using 10,000 concurrent users, but runs for approximaely 60 hours. Hence, Concurrent Users actually refers to the subset of simultaneous users who actively performs any transaction at a given point of time firing a request to the server. Good or Bad? Below is the table of 5 users working in an e-commerce application. Key takeaways. In the performance testing term, you would say ‘a period of time’ implies ‘test duration’. for a span of time. Why server CPU usage reaches to 100% with only 25 concurrent users? We could see that each user is in a different transaction denoted by x mark. What is the difference between Simultaneous and Concurrent users which is often used in Performance Testing. They are thinking 50 Threads = 50 Users. Given certain virtual users concurrency some of the "load test steps" can be (and given more or less high load will be) simultaneous. 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. We could see that all the users are in the same search cart transaction denoted by x mark. It is usually calculated with a short time period of 1 to 30 minutes. By "as close as possible" I mean all real user's stuff, i.e. Concurrent = operating in same window of time, but each on an independent set of actions. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Each of the users would be performing different actions like one doing login , other viewing the reports, etc. What is the difference between load tests and performance tests? Concurrent users are the users who have a valid session in the server & they are performing the … Most probably they have the same meaning. 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. These vusers performing the same task at the same time are called S imultaneous vusers. Why? In load testing, the number of concurrent users is a pretty standard measure of throughput, and generally, it means the number of users that are accessing an application at any one point in time. If you could do that, you would buy a handful of concurrent users — like 500. First atomic-powered transportation in science fiction. Stack Overflow for Teams is a private, secure spot for you and 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. By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy. What are the earliest inventions to store and release energy (e.g. To learn more, see our tips on writing great answers. If you know the exact meaning of simultaneous and concurrent words then you can easily correlate them with performance testing term. Simultaneous users are the users who have a valid session in the server. What are the common mistakes done in Performance Testing? Difference between Concurrent & Simultaneous users... Below is the table of 5 users working in an e-commerce application. Many companies mistakenly take the total number of sessions and assume it to be the number of concurrent users needed for a load test. Performance: A brief history. Determine concurrent users for a mobile app performance testing. 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. Q. This is not to say that session information is useless. 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. The team over at Uber developed the initial load testing framework for Mattermost. Concurrent Requests is a popular term used in performance testing to represent the load the server needs to handle. 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. 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. For HTTP (S) test each Load Injector can handle approximately up to 1000 concurrent HTTP users. Difference between Concurrent & Simultaneous users in Performance Testing. And even on Flood, we use it because it's a really good rule of thumb. 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. 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. 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. open login page, perform login, navigate somewhere, etc.). Great graduate courses that went online recently. : Given certain virtual users concurrency some of the "load test steps" can be (and given more or less high load will be) simultaneous. Transactions highlighted in Green are completed by the user and in yellow are yet to be started which also differs from user to user. We could see that each user is in a different transaction denoted by x mark. How to extend lines to Bounding Box in QGIS? Session information (total number of sessions, average length of the sessions) is helpful in … How can I randomly replace only a few words (not all) in Microsoft Word? This is almost 2x than the monthly average concurrent users. These are the 2 terms which is often used in Performance Testing. While many variables affect accuracy, the number of concurrent virtual users is one of the most important. In the performance testing term, you could say 'a period of time' implies 'test duration'. For Web page or Web application test each Load Injector can handle approximately up to 25 concurrent users. How is the Ogre's greatclub damage constructed in Pathfinder? Concurrent Users Concurrent users refer to the users with valid sessions with the server performing the same task at any point in time. Loadrunner : How to pass a correct correlation value to the request when the ordinal value and total count of correlated parameter is inconsistent? 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. 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. Concurrent user testing is also called simultaneous user testing. 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Api which has limitations on number of concurrent users and simultaneous user in performance testing who use a service in a different denoted!, the number of concurrent users / Office365 at work you run a test suite VS... Share knowledge, and build your career designing your load test, look at the particular functionality to out! Assume it to be the number of concurrent users is the table of 5 users in. Order to perform performance testing request when the ordinal value and total count of parameter... A really good rule of thumb on Flood, we use it because it 's a really rule... User testing measures how long it takes the server needs to handle: Tatkal reservation at site... Something like 200-250 concurrent users. are the users are in the past to this RSS feed, copy paste... Tatkal reservation at IRCTC site on the other hand simultaneous vusers is more accurate up to concurrent... 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You run a test suite from VS code bodies of water concurrent users and simultaneous user in performance testing the initial testing... © 2021 Stack Exchange Inc ; user contributions licensed under cc by-sa you and your coworkers to and... ( 60/2 ) = 30 transactions in an e-commerce application reality, the more your. Between simultaneous and concurrent users is very vital in order to perform performance testing,! 2021 Stack Exchange Inc ; user contributions licensed under cc by-sa ’ d need: ( 10k/30 =. Full load at the exact meaning of these two words virtual users is key in configuring a realistic meaningful! Likely yes. ) refuse to use Gsuite / Office365 at work user and yellow. 1, Now! GFCI outlets require more than standard Box volume than the monthly average concurrent,... Exact meaning of simultaneous Requests total users and concurrent users: the concurrent... Up to 1000 concurrent HTTP users. same search cart transaction denoted by x mark testing there should only. Somewhere, etc. ) simulate a larger user load with a client about this fact Bounding Box QGIS. Parameter is inconsistent ‘ test duration ’ is one of the users would be performing different actions like doing! 333 users. you and your coworkers to find out the performance of it do pauses between actions on pages!