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. 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. We could see that each user is in a different transaction denoted by x mark. Concurrent = operating in same window of time, but each on an independent set of actions. Do GFCI outlets require more than standard box volume? In the performance testing term, you would say ‘a period of time’ implies ‘test duration’. To understand the difference, I would suggest to know the meaning of these two words. 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. 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 … Yes, I am in an argument with a client about this fact. your coworkers to find and share information. How to extend lines to Bounding Box in QGIS? Ans: Simultaneous users apply the full load at the particular functionality to find out the performance of it. We could see that all the users are in the same search cart transaction denoted by x mark. 'Also JMeter concurrent threads are not "concurrent users" as real-life people do pauses between actions on web pages. What are the common mistakes done in Performance Testing? Why server CPU usage reaches to 100% with only 25 concurrent users? On the other hand simultaneous vusers is more to do with rendezvous points. Concurrent user testing is also called simultaneous user testing. In Europe, can I refuse to use Gsuite / Office365 at work? 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. 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. 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. What is concurrent user hits in load testing? This is almost 2x than the monthly average concurrent users. Q. open login page, perform login, navigate somewhere, etc.). "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 … On a weekend, the automated test run, also tests using 10,000 concurrent users, but runs for approximaely 60 hours. This is not to say that session information is useless. 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? For Web page or Web application test each Load Injector can handle approximately up to 25 concurrent users. Hence, you would have noticed this already. If you don't set any pauses in your tests then 20 concurrent threads will stand for something like 200-250 concurrent users.' 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. In the performance testing term, you could say 'a period of time' implies 'test duration'. Each of the users would be performing different actions like one doing login , other viewing the reports, etc. How to run web performance test for 200 users in VS 2013? Handling jmeter concurrent users with if statements. Difference between Concurrent & Simultaneous users... Below is the table of 5 users working in an e-commerce application. 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. By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy. What is the difference between load tests and performance tests? fly wheels)? And even on Flood, we use it because it's a really good rule of thumb. Determine concurrent users for a mobile app 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. Most of you probably know the term Concurrent User. Session information (total number of sessions, average length of the sessions) is helpful in … Making statements based on opinion; back them up with references or personal experience. Hence the users which are running under a test plan; irrespective of the activities they are doing; are called as 'Concurrent Users'. These vusers performing the same task at the same time are called S imultaneous vusers. In Microfocus LoadRunner this is represented by a concept called rendezvous. The more realistic your simulation, the more likely you'll catch bottlenecks that lead to a bad user experience. 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. To learn more, see our tips on writing great answers. for a span of time. We could see that each user is in a different transaction denoted by x mark. 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. Knowing the correct figures of simultaneous & concurrent users is very vital in order to perform performance testing of an application. How does SQL Server process DELETE WHERE EXISTS (SELECT 1 FROM TABLE)? 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. These performance tests are very basic tests where there is only single HTTP request (per user). Below is the table of 5 users working in an e-commerce application. 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. Why do "checked exceptions", i.e., "value-or-error return values", work well in Rust and Go but not in Java? 18 What is the use of simultaneous 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. It is also true that good tools that can test thousands of virtual users cost an arm and a leg. If you could do that, you would buy a handful of concurrent users — like 500. The answer is “may be” — though most likely yes! site design / logo © 2021 Stack Exchange Inc; user contributions licensed under cc by-sa. For HTTP (S) test each Load Injector can handle approximately up to 1000 concurrent HTTP users. Recognizing the difference between total users and concurrent users is key in configuring a realistic and meaningful test plan. I see the explanations are contradictory in the internet. Concurrent users is the total number of people who use a service in a predefined period of time. 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). How do I Performance test a 3rd party API which has limitations on number of concurrent users? Asking for help, clarification, or responding to other answers. 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. Simultaneous users are the users who have a valid session in the server. First atomic-powered transportation in science fiction. Performance: A brief history. It helps in identifying and measuring the problems in system parameters such as response time, throughput, deadlock occurrence or any other issues related simultaneously. 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. simultaneous = same action, same time. 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. So to reach 10K transactions, you’d need: (10k/30) = 333 users. Stack Overflow for Teams is a private, secure spot for you and 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 … Join Stack Overflow to learn, share knowledge, and build your career. Given certain virtual users concurrency some of the "load test steps" can be (and given more or less high load will be) simultaneous. How do you run a test suite from VS Code? While designing your load test, look at the right numbers and right time frames. 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. 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. 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A weekend, the more realistic your simulation, the number of concurrent users for a mobile app testing.
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