If you know the exact meaning of simultaneous and concurrent words then you can easily correlate them with performance testing term. How do airplanes maintain separation over large bodies of water? "Concurrent users" in performance testing - limitations. 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. Difference between Concurrent & Simultaneous users... Below is the table of 5 users working in an e-commerce application. They are thinking 50 Threads = 50 Users. For HTTP (S) test each Load Injector can handle approximately up to 1000 concurrent HTTP users. How can I randomly replace only a few words (not all) in Microsoft Word? Key takeaways. Translating requests per second into concurrent users. 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. These vusers performing the same task at the same time are called S imultaneous vusers. Great graduate courses that went online recently. for a span of time. If you don't set any pauses in your tests then 20 concurrent threads will stand for something like 200-250 concurrent users.' And even on Flood, we use it because it's a really good rule of thumb. Loadrunner - Replacing a character in a text file... Best Practices for Loadrunner Vugen scripting. 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. While many variables affect accuracy, the number of concurrent virtual users is one of the most important. Concurrent = users on the system using resources. for a span of time. On a weekend, the automated test run, also tests using 10,000 concurrent users, but runs for approximaely 60 hours. Transactions highlighted in Green are completed by the user … The more realistic your simulation, the more likely you'll catch bottlenecks that lead to a bad user experience. We could see that each user is in a different transaction denoted by x mark. Concurrent users is the total number of people who use a service in a predefined period of time. Most of you probably know the term Concurrent User. 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. open login page, perform login, navigate somewhere, etc.). "Everyone push the enter button in 3, 2, 1, Now!" How do I Performance test a 3rd party API which has limitations on number of concurrent users? 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. 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 … How do you run a test suite from VS Code? 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. We could see that all the users are in the same search cart transaction denoted by x mark. How does SQL Server process DELETE WHERE EXISTS (SELECT 1 FROM TABLE)? 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. In reality, the number of concurrent users derived from the available CPU and CPU cores is more accurate. In performance testing there should be only one term: virtual user which must represent real user, that's it. your coworkers to find and share information. 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. 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. 'Also JMeter concurrent threads are not "concurrent users" as real-life people do pauses between actions on web pages. 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. Yes, I am in an argument with a client about this fact. 18 What is the use of simultaneous users? What are the common mistakes done in Performance Testing? Why do "checked exceptions", i.e., "value-or-error return values", work well in Rust and Go but not in Java? 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. I see the explanations are contradictory in the internet. Knowing the correct figures of simultaneous & concurrent users is very vital in order to perform performance testing of an application. 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. Recognizing the difference between total users and concurrent users is key in configuring a realistic and meaningful test plan. What are the earliest inventions to store and release energy (e.g. Difference between Concurrent & Simultaneous users in Performance Testing. 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. Session information (total number of sessions, average length of the sessions) is helpful in … Each of the users would be performing different actions like one doing login , other viewing the reports, etc. 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. 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. What is the difference between load tests and performance tests? 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). 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. Given certain virtual users concurrency some of the "load test steps" can be (and given more or less high load will be) simultaneous. This is almost 2x than the monthly average concurrent users. Performance Testing, Simultaneous User, Concurrent Users, Difference between Simultaneous Users and Concurrent Users, Performance Testing Basics, Simultaneous Vs Concurrent simultaneous = same action, same time. Most probably they have the same meaning. Handling jmeter concurrent users with if statements. 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. We could see that each user is in a different transaction denoted by x mark. Of course, this calculation will only help you to estimate the number of concurrent users for a general load on a … 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. The goal of load testing is to find problems before they impact 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. Concurrent = operating in same window of time, but each on an independent set of actions. What is concurrent user hits in load 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. It is also true that good tools that can test thousands of virtual users cost an arm and a leg. These performance tests are very basic tests where there is only single HTTP request (per user). Hence, you would have noticed this already. By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy. Making statements based on opinion; back them up with references or personal experience. 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. To understand the difference, I would suggest to know the meaning of these two words. Join Stack Overflow to learn, share knowledge, and build your career. Concurrent users are the users who have a valid session in the server & they are performing the … Concurrent Users: The word concurrent is used only for the events that occur over a period of time i.e. 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. By "as close as possible" I mean all real user's stuff, i.e. How is the Ogre's greatclub damage constructed in Pathfinder? fly wheels)? "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 … In the performance testing term, you could say 'a period of time' implies 'test duration'. Determine concurrent users for a mobile app performance testing. Many companies mistakenly take the total number of sessions and assume it to be the number of concurrent users needed for a load test. This is not to say that session information is useless. Stack Overflow for Teams is a private, secure spot for you and Good or Bad? Thanks for contributing an answer to Stack Overflow! 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. : Given certain virtual users concurrency some of the "load test steps" can be (and given more or less high load will be) simultaneous. Performance: A brief history. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Say ‘ a period of 1 to 30 minutes where there is only HTTP... Concurrent & simultaneous users... below is the Ogre 's greatclub damage in. That all the users are the users would be performing different actions like doing... 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