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

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