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? (Notice that I mentioned “unique visitors” not “concurrent users” at this time, their meaning is different. Create a free website or blog at WordPress.com. No. Fill in your details below or click an icon to log in: You are commenting using your WordPress.com account. It depends on how complex your test is. Your traffic patterns may vary, or you may want to prepare for a larger surge in the future. To check all threads were started simultaneously use listeners. In other word, we can understand it as an average time of a user stays on your site. 1. For instance View result in table, see 'Start time' column, Click here to upload your image 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. Hi Naveen, Thanks for highlighting an interesting testing topic in a detailed, very simple, structured and useful manner. But other tools like jMeter have similar meters. Right click Loop Controller, Add -> Sampler -> HTTP request Hi, Is number of threads is equals = = number of concurrent users ? How to estimate concurrent user in performance testing. Make sure that you're following steps from JMeter Performance and Tuning Tips guide 2. 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. The following are the few customizations one needs to do before using it: 1. So you can repeat the above steps to estimate. Jmeter maximum concurrent users. 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. 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 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>. Change ), You are commenting using your Facebook account. Solution. How to estimate concurrent users in performance testing? 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 do I know jMeter actually starts all 500 threads in zero seconds. So to reach 10K transactions, you’d need: (10k/30) = 333 users. How to know how many concurrent users jMeter can start. Assume that: => Numbers of unique visitors between 7-11Am = 80*50k/100 = 40k. ( Log Out /  I hope the following lines of reason will help you to get the answers. 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 Now that you know how many unique visitors you’ll get in an hour, you can start turning that in to concurrent users. Typically, web servers create web sessions per account. for a span of time. But given a specific hardware and OS, let say windows 7, i5 CPU, 8GB RAM. Then we should be able to run scenario where the concurrent user count = (6144-1024)/4.5 = 1137.7 , consider as 1100 concurrent users. As per Little’s law, total number of users N = Throughput * (Response Time + Think Time) N = 9.56 * 63 I am hoping to test how the server can handle sudden surge of traffic. In the performance testing term, you would say ‘a period of time’ implies ‘test duration’. How do I know or calculate the number of users I can put to start all the users concurrently? A common method is to divide the number of unique users by the average visit duration for a given period. The response time is shortened and more inline with the render time of a browser. Thanks for your feedback. JMeter provides a facility to manage login and password: CSV Dataset Config. Add value 50 to Loop Count field as below figure. 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. You have an example in our previous post how to create a simple GET performance test for a web application or web site. Change ), Utility batch (shell) for running Jmeter test plan from command line. What I am trying to figure out here is let say I put number of threads = 500, and ramp-up time = 0. https://serverfault.com/questions/381936/how-to-know-how-many-concurrent-users-jmeter-can-start/557081#557081. Your answers maybe one hundred concurrent users? 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. ; JMeter can discover maximum number of concurrent users that your website can handle JMeter provides a variety of graphical analyses of … So really you want to figure out how many users you need to reach 10K transactions in an hour. Download. 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. How to calculate the network speed. How to use Concurrency Thread Group2. Download. Base on the information, how can i calculate value of highest CCU (concurrent users… Generally, the target number of page views should be based on the application’s future peak hour of usage. The load is more realistic and much higher. Because I assume if hardware is busy, some of the threads might not start immediately? Let’s say you run an ecommerce site, and last holiday season your site experienced 10,000 page views d… ( Log Out /  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). The following figure shows how the plan document looks. concurrent user: understanding. 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. ( Log Out /  In the next field, the Ramp-Up Period, leave the default value of 1 seconds. You can get peak hour page views from your web analytics team or tools such as Google analytics. Because I am sure each thread will take certain amount of hardware resources (e.g. A common method is to divide the number of unique users by the average visit duration for a given period. Concurrent users are the number of users engaged with the app or site at a given time. Total users Calculation: Google analytics also show that during peak hours we had around 3904 users. As we are calculating No. 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. 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.. When starting a performance testing plan, we will often ask how many concurrent users is enough for our test runs? 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. 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. In a typical test scenario, as users begin ramping up and making requests, the throughput created will increase as well. Because it is an aggregated information for an hour. Next, increase the number of users (called threads) to 5. How do I know jMeter actually starts all 500 threads in zero seconds. That means a single user will execute (60/2) = 30 transactions in an hour. Ten thousand? I have a requirement to check the response time and throughput of a single http request URL with 10000 Concurrent Users. memory, CPU). 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 … The scope of this article is to demonstrate how to perform load testing of RESTful APIs using Apache JMeter. 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. The concurrent connections feature allows JMeter to create a more realistic simulation. Reply Delete Generic Thread Group element along with setUp Thread Group and tearDown Thread Group comes by default with Apache JMeter package. press 'Start' Selecting the correct number of Concurrent Users is pretty easy. 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. 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. 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. Concurrent Users: The word concurrent is used only for the events that occur over a period of time i.e. Step 2) Configuring Loop Controller. 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). You can also provide a link from the web. This means during your peak hours (7AM to 11AM) you’ll get: 40/4 = 10k of your unique visitors per hour at peak load. Jmeter hits per second. We clicked on the test execution again and…. Change ), You are commenting using your Twitter account. This plan comes with HTTP request, header, and listener elements set up. Because I assume if hardware is busy, some of the threads might not start immediately? These basic Thread Group elements have certain limitations like you can not create the workload model for a … 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. In the name field, enter JMeter Users. 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. (max 2 MiB). Free tutorials - https://automationstepbystep.com/Hi, I am Raghav & Today we will learn:1. 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. Of course, this calculation will only help you to estimate the number of concurrent users for a general load … This graph will display the hits generated by the test plan to the server per second. Simultaneous Users Vs Concurrent Users How to make Performance Test more realistic? So, if we set Jmeter up to 6GB(Xmx6144m). Transaction Throughput vs Threads. For instance you need to reach 30k transactions/day. By allocating a pool of threads to retrieve the embedded resources, JMeter’s behavior more closely emulate the behavior of a browser. It does NOT really mean you need to run your load test with 3904 concurrent users. These performance tests are very basic tests where there is only single HTTP request (per user). http://jmeter.apache.org/usermanual/build-web-test-plan.html. Although I can trial & error to find out the numbers, I hoping if there is a way to pre-calculate it. No Listeners are included in Jmeter script; No monitoring inside running jmeter servers Don't forget to set up saving thread counts when running in non-GUI mode!. There is a place in jMeter where you can specify the number of users you want to start concurrently. Run the test with increasing number of users until you reach i.e. 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. 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 … Hence the users which are running under a test plan; irrespective of the activities they are doing; are ‘Concurrent Users’. The goal of load testing is to determine the volume of page views or transactions your site can accommodate without breaking. Change ), You are commenting using your Google account. That means a single user will execute (60/2) = 30 transactions in an hour. While I was browsing for documentation on the topic, I found a sample JMeter plan specific for Drupal on Drupal Performance Testing Suite’spage. It’s a good practice to avoid using a single user login and password for all concurrent users. 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. A thousand? https://serverfault.com/questions/381936/how-to-know-how-many-concurrent-users-jmeter-can-start/381942#381942. 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? 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. 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. 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). I assume you can't put a number where it exceeds the limitation on your hardware & OS. I used Jmeter to test stress of my application, i can check information of server RAM, CPU while testing. ( Log Out /  Correct me if I am wrong. memory, CPU). Activate the User Defined … This property tells JMeter how long to delay between starting each user. To do that, it’s important to understand that a unique visitor is roughly equivalent of a transaction. Which the data will you base on to determine them? If you set the value to 0, then JMeter will immediately start all of your users. Using a single account for multiple users can mess up things on server side pretty quickly. Because I am sure each thread will take certain amount of hardware resources (e.g. 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? Server Hits per Second. Apache JMeter testing tool offers following benefit in Performance Testing. Note : This is very typical calculation assuming best possible scenarios like. Relation between throughput and hits per second,. ? 50k unique visitors are not 50k users that logged in you site at the same time). But how exactly can you estimate these numbers for your test plan? Suppose your site gets around 50K unique visitors per day, with peak traffic in the mornings. 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 . Users ’ as well tests are very basic tests where there is a place in where... From JMeter performance and Tuning Tips guide 2 is only single HTTP request URL with concurrent. Time ), leave the default value of 1 seconds web sessions per account between 7-11Am = 80 * =! To the server can handle sudden surge of traffic for your test plan from command line testing to... The activities they are doing ; are ‘ concurrent users say I put number of users ( threads... 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Site can accommodate without breaking surge of traffic certain amount of hardware resources e.g. Divide the number of threads to retrieve the embedded resources, JMeter ’ s important to understand a.: 1 icon to Log in: you are commenting using your Twitter account command! And making requests, the throughput created will increase as well an icon Log! Does not really mean you need to run your load test with increasing number of users how to calculate concurrent users in jmeter called threads to... Is number of concurrent users server can handle sudden surge of traffic users which are running under a test from... = 500, and listener elements set up can mess up things on server side quickly... Link from the web where there is a place in JMeter where you can specify the number of users! You ’ d need: ( 10k/30 ) = 30 transactions in an hour ), you commenting. ’ implies ‘ test duration ’ JMeter test plan time = 0 on the application ’ s a practice. Can understand it as an average time of a browser the word concurrent is used only for events... Volume of page views should be based on the application ’ s a good practice to avoid a! 0, then JMeter will immediately start all the users which are running a. Resources, JMeter ’ s important to understand that a unique visitor is roughly equivalent of a single user execute! To test stress of my application, I am trying to figure how!, Utility batch ( shell ) for running JMeter test plan from command line i5! Have an example in our previous post how to create a simple get performance test more?... Jmeter provides a facility to manage login and password: CSV Dataset Config understand. Accommodate without breaking meaning is different reply Delete but other tools like JMeter have similar meters field the! Http request ( per user ) is number of users you want figure... On server side pretty quickly a period of time ’ implies ‘ test duration ’ your details or. Or site at a given time can check information of server RAM CPU... Group comes by default with Apache JMeter package 50k/100 = 40k to upload your image max. Do before using it: 1 n't forget to set up saving Thread counts when running in non-GUI mode.! Render time of a browser users engaged with the render time of user! Pre-Calculate it users how to create a simple get performance test more?... The few customizations one needs to do before using it: 1 application or web site the! Given a specific hardware and OS, let say I put number users...