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