How do airplanes maintain separation over large bodies of water? Why do "checked exceptions", i.e., "value-or-error return values", work well in Rust and Go but not in Java? Concurrent user testing measures how long it takes the server to respond to a specified number of simultaneous requests. 18 What is the use of simultaneous users? Concurrent Users Concurrent users refer to the users with valid sessions with the server performing the same task at any point in time. Loadrunner - Replacing a character in a text file... Best Practices for Loadrunner Vugen scripting. 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. Most probably they have the same meaning. Example: Tatkal reservation at IRCTC site 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. What are the common mistakes done in Performance Testing? First atomic-powered transportation in science fiction. How can I randomly replace only a few words (not all) in Microsoft Word? Q. Determine concurrent users for a mobile app performance testing. 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. Loadrunner : How to pass a correct correlation value to the request when the ordinal value and total count of correlated parameter is inconsistent? In the performance testing term, you would say ‘a period of time’ implies ‘test duration’. Difference between Concurrent & Simultaneous users in Performance Testing. 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. Hence, you would have noticed this already. Performance: A brief history. They are thinking 50 Threads = 50 Users. Why would someone get a credit card with an annual fee? for a span of time. The answer is “may be” — though most likely yes! 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. But can you simulate a larger user load with a small set of virtual users? open login page, perform login, navigate somewhere, etc.). That means a single user will execute (60/2) = 30 transactions in an hour. How do I Performance test a 3rd party API which has limitations on number of concurrent users? Knowing the correct figures of simultaneous & concurrent users is very vital in order to perform performance testing of an application. Simultaneous users are the users who have a valid session in the server. 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. site design / logo © 2021 Stack Exchange Inc; user contributions licensed under cc by-sa. 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. 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. 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. I see the explanations are contradictory in the internet. Stack Overflow for Teams is a private, secure spot for you and Concurrent = operating in same window of time, but each on an independent set of actions. These vusers performing the same task at the same time are called S imultaneous vusers. It is also true that good tools that can test thousands of virtual users cost an arm and a leg. Asking for help, clarification, or responding to other answers. Translating requests per second into concurrent users. By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy. Good or Bad? If you know the exact meaning of simultaneous and concurrent words then you can easily correlate them with performance testing term. Concurrent Requests is a popular term used in performance testing to represent the load the server needs to handle. 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. Transactions highlighted in Green are completed by the user and in yellow are yet to be started which also differs from user to user. Handling jmeter concurrent users with if statements. In Microfocus LoadRunner this is represented by a concept called rendezvous. For Web page or Web application test each Load Injector can handle approximately up to 25 concurrent users. Recognizing the difference between total users and concurrent users is key in configuring a realistic and meaningful test plan. It is usually calculated with a short time period of 1 to 30 minutes. 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. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. simultaneous = same action, same time. Many companies mistakenly take the total number of sessions and assume it to be the number of concurrent users needed for a load test. Quick Steps Overview 1. On the other hand simultaneous vusers is more to do with rendezvous points. 'Also JMeter concurrent threads are not "concurrent users" as real-life people do pauses between actions on web pages. To learn more, see our tips on writing great answers. 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. We could see that each user is in a different transaction denoted by x mark. 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). difference between Simultaneous & Concurrent users. These performance tests are very basic tests where there is only single HTTP request (per user). for a span of time. In Europe, can I refuse to use Gsuite / Office365 at work? Why server CPU usage reaches to 100% with only 25 concurrent users? Why? Of course, this calculation will only help you to estimate the number of concurrent users for a general load on a … Thanks for contributing an answer to Stack Overflow! 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. To understand the difference, I would suggest to know the meaning of these two words. While many variables affect accuracy, the number of concurrent virtual users is one of the most important. These are the 2 terms which is often used in Performance Testing. Performance Testing, Simultaneous User, Concurrent Users, Difference between Simultaneous Users and Concurrent Users, Performance Testing Basics, Simultaneous Vs Concurrent 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. 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 … The goal of load testing is to find problems before they impact users. 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. "Everyone push the enter button in 3, 2, 1, Now!" How does SQL Server process DELETE WHERE EXISTS (SELECT 1 FROM TABLE)? So to reach 10K transactions, you’d need: (10k/30) = 333 users. 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