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