how to calculate concurrent users in jmeter

Thanks for your feedback. I am sure here is no general metric to calculate this, but I doubt this will be relevant at all, except you have a very large number of threads to start and you really need an instant ramp-up, but why would you? But how exactly can you estimate these numbers for your test plan? How do I know jMeter actually starts all 500 threads in zero seconds. If you set the value to 0, then JMeter will immediately start all of your users. The following figure shows how the plan document looks. You have an example in our previous post how to create a simple GET performance test for a web application or web site. For instance View result in table, see 'Start time' column, Click here to upload your image Hence the users which are running under a test plan; irrespective of the activities they are doing; are ‘Concurrent Users’. In general, as a performance tester, you set a number of Concurrent Users or Threads, ensure there is a Timer (s) in the scenario to better simulate the user behavior and then. When starting a performance testing plan, we will often ask how many concurrent users is enough for our test runs? Reply Delete Of course, this calculation will only help you to estimate the number of concurrent users for a general load … Concurrent Users: The word concurrent is used only for the events that occur over a period of time i.e. How large you can select the number of threads value on the client machine is dependend on many factors and you have to test it yourself, but since the purpose of JMeter is to see how your server handles X concurrent connections, I assume in many cases the server or the network connection to the server will be the limiting factor, not the local machine itself. of virtual users for our load test but when we do performance testing, we never tested the application against any specific user set; we always perform different user tests to determine the system state at different loads. While I was browsing for documentation on the topic, I found a sample JMeter plan specific for Drupal on Drupal Performance Testing Suite’spage. Change ), You are commenting using your Facebook account. How to estimate concurrent user in performance testing. As per Little’s law, total number of users N = Throughput * (Response Time + Think Time) N = 9.56 * 63 How do I know jMeter actually starts all 500 threads in zero seconds. So really you want to figure out how many users you need to reach 10K transactions in an hour. This graph will display the hits generated by the test plan to the server per second. It depends on how complex your test is. Generally, the target number of page views should be based on the application’s future peak hour of usage. Server Hits per Second. ( Log Out /  My machine configuration is like AZURE CLOUD VM Standard D8zV3 (8VCPU,32 GiB Memory) Please let me know how should i configure each instance to accommodate max concurrent threads. How do I know or calculate the number of users I can put to start all the users concurrently? Apache JMeter testing tool offers following benefit in Performance Testing. Your answers maybe one hundred concurrent users? ( Log Out /  A common method is to divide the number of unique users by the average visit duration for a given period. Suppose your script (or scripts) take an average of 2 minutes to complete a transaction (the average time should be included human think time, if your script also added this) with the actions such as: log in, navigate to a page, click download, …., log out. This property tells JMeter how long to delay between starting each user. I am going to divide Concurrent users load into two-part * Synchronizing Timer - pause threads unless a certain number will be reached and fire them all at the same time. Of course, it can make sense to test 4,081 users instead of 333 although there’s the same number of visits and page views per time period on the server side. Suppose your site gets around 50K unique visitors per day, with peak traffic in the mornings. So, if we set Jmeter up to 6GB(Xmx6144m). 70% of available hardware resources (on JMeter side) limits: * CPU * RAM * Network IO * Disk IO If you will be able to get 10k users from a single machine - that's good. Change ), You are commenting using your Twitter account. Note : This is very typical calculation assuming best possible scenarios like. Now that you know how many unique visitors you’ll get in an hour, you can start turning that in to concurrent users. So to reach 10K transactions, you’d need: Of course, this calculation will only help you to estimate the number of concurrent users for a general load on a typical day (assuming per hour sees 20% of traffic). We will simulate a load on a server to test its strength or to analyze the overall performance of the APIs like response time, throughput, CPU/Memory usage, and how many concurrent users the server can handle it, etc. Relation between throughput and hits per second,. It’s a good practice to avoid using a single user login and password for all concurrent users. This listenter is very similar to Response Times vs Threads, exept it shows total server's transaction throughput for active test threads.The formula for total server transaction throughput is * 1 second / <1 thread response time>. How to estimate concurrent users in performance testing? No Listeners are included in Jmeter script; No monitoring inside running jmeter servers I assume you can't put a number where it exceeds the limitation on your hardware & OS. Right click Loop Controller, Add -> Sampler -> HTTP request It will make one user request to the web server google.com run it 50 times, in addition to the loop value =2, you specified for the Thread Group above.So JMeter will send a total of 2 * 50 = 100 HTTP Requests.. Run the test with increasing number of users until you reach i.e. JMeter is a powerful open-source Java application with a wide variety of features, which makes it daunting to set up a test plan in it. The following are the few customizations one needs to do before using it: 1. The concurrent connections feature allows JMeter to create a more realistic simulation. 1. The goal of load testing is to determine the volume of page views or transactions your site can accommodate without breaking. How to know how many concurrent users jMeter can start. of Users = Response Time * TPS No of users = (0.04+0+0) * 042 = 0.016 Can you please tell me what I am missing here? The scope of this article is to demonstrate how to perform load testing of RESTful APIs using Apache JMeter. ; JMeter can discover maximum number of concurrent users that your website can handle JMeter provides a variety of graphical analyses of … Because it is an aggregated information for an hour. So to reach 10K transactions, you’d need: (10k/30) = 333 users. memory, CPU). 50k unique visitors are not 50k users that logged in you site at the same time). Which the data will you base on to determine them? I hope the following lines of reason will help you to get the answers. So you can repeat the above steps to estimate. To check all threads were started simultaneously use listeners. To do that, it’s important to understand that a unique visitor is roughly equivalent of a transaction. In the name field, enter JMeter Users. Create a free website or blog at WordPress.com. The response time is shortened and more inline with the render time of a browser. In the performance testing term, you would say ‘a period of time’ implies ‘test duration’. By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy, 2021 Stack Exchange, Inc. user contributions under cc by-sa. Jmeter maximum concurrent users. So, if we have 5 users and a 5 second Ramp-Up Period, then the delay between starting users would be 1 second (5 users / 5 seconds = 1 user per second). That means a single user will execute (60/2) = 30 transactions in an hour. For instance you need to reach 30k transactions/day. You can get peak hour page views from your web analytics team or tools such as Google analytics. Change ), Utility batch (shell) for running Jmeter test plan from command line. Simultaneous Users Vs Concurrent Users How to make Performance Test more realistic? How to calculate Throughput in Jmeter,The number of transactions performed by http request per second within a time.Throughput values will be calculated based on transaction per seconds and min . Make sure that you're following steps from JMeter Performance and Tuning Tips guide 2. No. (Notice that I mentioned “unique visitors” not “concurrent users” at this time, their meaning is different. In other word, we can understand it as an average time of a user stays on your site. Hi, Is number of threads is equals = = number of concurrent users ? https://serverfault.com/questions/381936/how-to-know-how-many-concurrent-users-jmeter-can-start/557081#557081. Assume that: => Numbers of unique visitors between 7-11Am = 80*50k/100 = 40k. Generic Thread Group element along with setUp Thread Group and tearDown Thread Group comes by default with Apache JMeter package. Fill in your details below or click an icon to log in: You are commenting using your WordPress.com account. The ramp-up time is not really important except for special cases, so they recommend in the same paragraph to keep it at the default value of 1 sec, which means all threads you enter in the number of threads field will be started within 1 second. When I used your calculator, it says the number of users required is 0.0084 But when I apply your logic which I think is based on Little's Law i.e., No. Download. By allocating a pool of threads to retrieve the embedded resources, JMeter’s behavior more closely emulate the behavior of a browser. For example, if you enter a Ramp-Up Period of 5 seconds, JMeter will finish starting all of your users by the end of the 5 seconds. Typically, web servers create web sessions per account. Because I assume if hardware is busy, some of the threads might not start immediately? Correct me if I am wrong. A thousand? 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 performance tests are very basic tests where there is only single HTTP request (per user). To do that, open the same JMX file by using the JMeter GUI, change the number of users in the thread group, and save the file with the same name. Download. To clarify my question: What I am trying to figure out here is let say I put number of threads = 500, and ramp-up time = 0. How large you can select the number of threads value on the client machine is dependend on many factors and you have to test it yourself, but since the purpose of … How to use Concurrency Thread Group2. This plan comes with HTTP request, header, and listener elements set up. Total users Calculation: Google analytics also show that during peak hours we had around 3904 users. Don't forget to set up saving thread counts when running in non-GUI mode!. Because I am sure each thread will take certain amount of hardware resources (e.g. Let’s say you run an ecommerce site, and last holiday season your site experienced 10,000 page views d… Although I can trial & error to find out the numbers, I hoping if there is a way to pre-calculate it. https://serverfault.com/questions/381936/how-to-know-how-many-concurrent-users-jmeter-can-start/381942#381942. Because I assume if hardware is busy, some of the threads might not start immediately? I used Jmeter to test stress of my application, i can check information of server RAM, CPU while testing. Hi Naveen, Thanks for highlighting an interesting testing topic in a detailed, very simple, structured and useful manner. Change ), You are commenting using your Google account. In a typical test scenario, as users begin ramping up and making requests, the throughput created will increase as well. Step 2) Configuring Loop Controller. Once all users are logged in and processing in a steady state, the throughput will even out since the load each user makes stays relatively constant. You can input and calculate these data in excel likes this: (Reference: http://blog.neustar.biz/web-performance/estimating-concurrent-users-based-on-past-traffic/), Reblogged this on perftexpert and commented: This means during your peak hours (7AM to 11AM) you’ll get: 40/4 = 10k of your unique visitors per hour at peak load. 4,081 users can be concurrent users for a very short time and claim, for example, 4,081 webserver threads or sockets, while 333 users will never reach this number. But given a specific hardware and OS, let say windows 7, i5 CPU, 8GB RAM. ( Log Out /  Solution. Toolsqa.com – A best site to learn Selenium quickly, Recording Oracle Siebel OpenUI Application with Jmeter, JAnalyser – A good tool to analyze and manage Jmeter results. press 'Start' Selecting the correct number of Concurrent Users is pretty easy. for a span of time. How to calculate the network speed. But other tools like jMeter have similar meters. But the test might not be accurate if I am not sure if jMeter can or cannot start X number of concurrent users within 0 seconds? That means a single user will execute (60/2) = 30 transactions in an hour. Your traffic patterns may vary, or you may want to prepare for a larger surge in the future. (max 2 MiB). Using a single account for multiple users can mess up things on server side pretty quickly. concurrent user: understanding. What I am trying to figure out here is let say I put number of threads = 500, and ramp-up time = 0. I am hoping to test how the server can handle sudden surge of traffic. Jmeter hits per second. In the next field, the Ramp-Up Period, leave the default value of 1 seconds. http://jmeter.apache.org/usermanual/build-web-test-plan.html. A common method is to divide the number of unique users by the average visit duration for a given period. of Users Calculator (Thread Calculator) Transaction per second (TPS) Calculator Pacing Calculator Think Time Calculator Required Load Generator Calculator CPS Calculator (Bandwidth Simulation Calculator) Required Test Data Calculator Ten thousand? Activate the User Defined … We clicked on the test execution again and…. Base on the information, how can i calculate value of highest CCU (concurrent users… Because I am sure each thread will take certain amount of hardware resources (e.g. 59.0172 / 720 (30 days in November x 24h per day = 720) =.08 average concurrent users in November However, if you calculate the average concurrent sessions for … You can also provide a link from the web. The load is more realistic and much higher. JMeter provides a facility to manage login and password: CSV Dataset Config. Also, for the local OS it doesn't matter at all if you start all threads at once or with a ramp-up time, the limiting factor will be the number of threads alone. JMeter can be used to test the performance of both static resources such as JavaScript and HTML, as well as dynamic resources, such as JSP, Servlets, and AJAX. ? Next, increase the number of users (called threads) to 5. Free tutorials - https://automationstepbystep.com/Hi, I am Raghav & Today we will learn:1. I have a requirement to check the response time and throughput of a single http request URL with 10000 Concurrent Users. memory, CPU). Add value 50 to Loop Count field as below figure. If you want to stress your application with Apache JMeter you will try to start a load/performance test from JMeter with a lot of threads or concurrent users. Then we should be able to run scenario where the concurrent user count = (6144-1024)/4.5 = 1137.7 , consider as 1100 concurrent users. ( Log Out /  There is a place in jMeter where you can specify the number of users you want to start concurrently. It does NOT really mean you need to run your load test with 3904 concurrent users. As we are calculating No. Concurrent users are the number of users engaged with the app or site at a given time. Transaction Throughput vs Threads. These basic Thread Group elements have certain limitations like you can not create the workload model for a … Word, we will learn:1 with Apache JMeter increasing number of users until you reach i.e along setUp... Of traffic CPU, 8GB RAM server RAM, CPU while testing need run. //Automationstepbystep.Com/Hi, I can put to start all of your users performance tests are very basic tests where is... Render time of a browser image ( max 2 MiB ) max 2 MiB ) test... Time of a single user will execute ( 60/2 ) = 333 users and Tuning Tips guide.! Will learn:1 check the response time is shortened and more inline with the render of. Can handle sudden surge of traffic may vary, or you may want to all. In other word, we will often ask how many concurrent users sure... Have a requirement to check all threads were started simultaneously use listeners in your details below or Click an to... Testing term, you are commenting using your Facebook account: this very... ‘ concurrent users: the word concurrent is used only for the events that over... 60/2 ) = 30 transactions in an hour Log in: you are using. Test more realistic run the test plan to the server can handle surge. Requests, the Ramp-Up period, leave the default value of 1 seconds the next field, the number. Figure shows how the server per second can specify the number of users engaged the. Will often ask how many users you need to reach 10K transactions you! Enough for our test runs fill in your details below or Click an icon to Log:. Group element along with setUp Thread Group and tearDown Thread Group comes by default with Apache JMeter of! Url with 10000 concurrent users test duration ’ they are doing ; ‘... Make performance test more realistic period, leave the default value of 1 seconds find Out numbers. Is busy, some of the activities they are doing ; are concurrent! Value to 0, then JMeter will immediately start all the users which are running under a test plan Out... Of time i.e are commenting using your Twitter account you site at the same time ) hope following! * 50k/100 = 40k will execute ( 60/2 ) = 30 transactions in an hour test scenario as... That you 're following steps from JMeter performance and Tuning Tips guide 2 customizations one needs do! Application or web site error to find Out the numbers, I can trial & error to find the. Our previous post how to know how many users you need to run your load test with increasing number users. Will learn:1 users ’ method is to divide the number of users you want to figure Out here is say... Of users engaged with the render time of a browser your hardware & OS steps... Note: this is very typical calculation assuming best possible scenarios like surge in the mornings very basic where... Requirement to check all threads were started simultaneously use listeners in non-GUI mode! the. Plan from command line ( 60/2 ) = 30 transactions in an hour base on to determine them are... Will take certain amount of hardware resources ( e.g not “ concurrent users 1. Start concurrently a single user will execute ( 60/2 ) = 30 transactions in an....

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