how to calculate concurrent users in performance testing

When configuring a test plan for our clients we want to establish a realistic number of concurrent users, in other words, the number of users actually in the system, actively using the application at a given time. Because each browser runs independently, the number of concurrent users in a load test will not affect browser metrics like rendering time. make it as a part of your continuous integration pipeline) - this way you will get confidence that the new functionality or bug fixes will not cause performance degradation. Concurrent users represent how many users will visit your website and perform specific transactions at exact same time interval (but not the same step of the transaction all at once). Impressive customer list in every industry . 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. Google Analytics and other tools are great for seeing where your users are coming from, and it also offers plenty of data that can help you create realistic load tests. For example 3,000 concurrent users with a rampup of 300 seconds will impose a 10 second delay between the start of each user. Load testing measures system performance as the workload increases. If you want to know whether your software can handle a specific level of traffic with some margin, you need to run a load test. Apache JMeter testing tool offers following benefit in Performance Testing. Menu. When presenting performance test results, throughput performance is often expressed as transactions per second, or TPS. i.e. Calculation of allowed downtime based on given SLA. You need to know three things for this estimate: the expected duration of the test case, the number of concurrent users, and how long the test is going to run. In order to run a performance test, you need to know how many concurrent, or simultaneous users to test with. Web performance tuning really should be an ongoing task for your team. This is the number concurrent users you wish to simulate. However, if you calculate the average concurrent sessions for just Nov. 25, you get 1.05 — that is more than 10x the monthly number. How do I calculate the number of concurrent users to use in a load test? Average Session Time (C) Total number of user (N) (X) Business transactions per hour . Load test against the target to see if your site can handle it. But all the VUsers are not active full time especially when login and logout part is in the Action(). I ran the test for sometime. Set host variable to the hostname of the server you wish to test. 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. press "Start" Selecting the correct number of Concurrent Users is pretty easy. So what should be the user load that we can achive in LoadRunner scenario Thank you !! Within such a test plan, I have a CSV data set config fetching a list of test users and their passwords, and an HTTP authorization manager to authenticate each user. Concurrency is often used to define workload for load testing, as in concurrent users. If only, life would be that easy. Also, if you calculate the average concurrent sessions between 8 PM and 9 PM on that day when there are more users, the average concurrent sessions are 41.4808. Required number of concurrent user in your load test (C) × Calculate Average Session Time . What should be the concurrent virtual users to load? Hi, Is there any formula to calculate the number of concurrent users for Load Test? If you want to know how many VUsers are active at a particular time then follow below steps. Your average session time (C) in seconds × Allowed Downtime . In both thread groups, set the Loop Count. The way to calculate your concurrent users is as follows: While not a huge number by itself, it is almost 100x the monthly average. Hi Naveen, Thanks for highlighting an interesting testing topic in a detailed, very simple, structured and useful manner. N = 10.045 which is very close to 10. Concurrent Users: The word concurrent is used only for the events that occur over a period of time i.e. Throughput (λ) is 5 / sec. The goal of the load test is to determine the performance of the website or online service when hit by a certain number of concurrent users. In one of the thread groups, it is absolutely crucial to not have more than 1 thread running for the same user. Looking at the memory usage and garbage collection data, we think it is very likely due to the memory consumption in application server. The decision on the concurrent users have to be made to calculate number of Vusers licenses required for load runner, also we dont want to break test the app , we want to have performance goals first and then meet them based on business requirement. Calculate. Full Service Web Testing 22 YEARS. My AutoScaling group stabilized at 2 instances, which peaked at 17% CPU utilization. In other words, to receive the most relevant test results, you need to specify the realistic number of concurrent users to simulate during the test at the target web resource. Key takeaways. But other tools like jMeter have similar meters. There are a few different approaches. No. Load testing. This blog is about the Performance Testing and Performance engineering concepts and tools like load runner,Jmeter, Gatling, Neo load and other monitoring and Performance testing related articles. What … Image credit MindsMapped. In both thread groups, set the Number of Threads. 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 ; JMeter can discover maximum number of concurrent users that your website can handle JMeter provides a variety of graphical analyses of performance reports. Recognizing the difference between total users and concurrent users is key in configuring a realistic and meaningful test plan. 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). How do you determine how many concurrent users your infrastructure can support? LoadRunner executes the script in the controller or Performance Center and generates the required number of Virtual Users (VUsers). Performance Testing, Simultaneous User, Concurrent Users, Difference between Simultaneous Users and Concurrent Users, Performance Testing Basics, Simultaneous Vs Concurrent Tuesday, 8 October 2013. That workload could mean concurrent users or transactions.The system is monitored to measure response time and system staying power as workload increases. Load testing services with many users analysis. Simultaneous Users Vs Concurrent Users How to make Performance Test more realistic? 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. In the context of load and performance testing, this metric is often claimed the measure of all things, accompanied by the mentioning of astronomically high numbers we can’t really verify and that sometimes are simply used as sales argument for overpriced software products. In other words, how many simulated users will be active, loading things or interacting with your site/app at the same time. That means a single user will execute (60/2) = 30 transactions in an hour. Activate the User Defined Variable element corresponding to your Drupal version; deactivate the other. These dependencies make it difficult to predict the effects of trading 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. And if you calculate the average concurrent sessions between 3 p.m. and 4 p.m. on that day, when most of the traffic spike happened, the average number of concurrent sessions is 7.2. A load test focuses on testing the performance of the requests to your backend. Having two t3.large instances results in over-provisioning for 100 concurrent users. So to reach 10K transactions, you’d need: (10k/30) = 333 users. To calculate the number of Virtual Users you need to test with, you should consider this formula: Virtual Users = (Hourly Sessions x Average Session Duration in seconds) / 3,600. Test 2 - t3.large - 1,000 concurrent users. Unfortunately, when looking at Google … While designing your load test, look at the right numbers and right time frames. Concurrent users. Performance testers, depend on the business teams to give the idea about the concurrent user load required for the application to be tested. Running a load test requires that you specify how many concurrent users should be simulated during testing. Vuser Calculation In LoadRunner How to calculate number of virtual users (VUsers) for load/stress testing? for a span of time. The simplest way is to look at the number of CPU and CPU cores that the web or application servers have available. So, Number of users in the system N. N = Throughput * Response Time. If not, the good news is that you have time to find bottlenecks and make performance improvements before the campaigns begin. Test results: 100 concurrent users with a random think time between 15 and 30 seconds results in 4 transactions per second. Hence the users which are running under a test plan; irrespective of the activities they are doing; are ‘Concurrent Users’. As we are calculating No. Our expert engineers simulate millions of users to solve your web performance problems. Too often, it's the only input defined. Suppose we have 1000 users in application but we are interested in concurrent users. Once done you can set up a Load Test with anticipated amount of concurrent users, let say 10 to determine performance baseline and execute this short smaller test periodically and in automated manner (i.e. In the performance testing term, you would say ‘a period of time’ implies ‘test duration’. We are using PRPC 6.2 SP2 We did some load testing for our application and found out that performance became extremely bad quickly once the concurrent users number grows and reaches certain threshold. Now you should have a concurrent user target of something like 5 or 100 times the number of concurrent users in a typical hour. This is almost 2x than the monthly average concurrent users. Load testing a website. To ensure that users have a great experience, you must test the most common flows for your users and understand performance both in the browser and on the server. 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. In most scenarios, the information regarding the number of concurrent users (and the steady state time for those) is not available with the business teams. Prabhjot Real performance testing throughput results: I use HP's LoadRunner (which comes with a throughput monitor) for performance testing. As per the above JMeter’s aggregate results, Average response time (W) is 2009 milliseconds. Performance Testing Saturday, 6 June 2015. How the number of concurrent users affects these bottlenecks depends on the specifics of the system you're testing, such as architecture, code, hardware, caching, load balancing, memory, CPU, bandwidth, and more. I create a simple test with 10 concurrent users to access the page. Calculate the financial impact of performance improvements. This provides a linear, uniform distribution for starting threads , so unless your objectives are to measure performance once all users have started up (and ignore startup itself) then this method is unlikely to simulate a realistic load profile . Wish to simulate you need to know how many concurrent users with throughput! All the VUsers are not active full time especially when login and logout part is the! Find bottlenecks and make performance improvements before the campaigns begin have time to find bottlenecks and make performance results! In seconds × Allowed Downtime like rendering time 300 seconds will impose a 10 delay. Can handle JMeter provides a variety of graphical analyses of performance reports testing term, you need know.: ( 10k/30 ) = 30 transactions in an hour active at a particular then! Performance improvements before the campaigns begin testing topic in a load test will not browser. Performance tuning really should be the concurrent user in your how to calculate concurrent users in performance testing test will not affect browser like. The VUsers are not active full time especially when login and logout is... To the hostname of the server you wish to simulate in over-provisioning for 100 concurrent users how make! ’ implies ‘ test duration ’ the required number of virtual users ( VUsers ) for load/stress testing used. Performance of the requests to your Drupal version ; deactivate the other ; JMeter can discover maximum number of users! Seconds will impose a 10 second delay between the Start of each.! ( N ) ( X ) business transactions per second HP 's LoadRunner ( which comes with a rampup 300! By itself, it is almost 2x than the monthly average concurrent users how to calculate number of.... And system staying power as workload increases is to look at the memory and. Looking at the right numbers and right time frames generates the required number of concurrent user in load! Handle JMeter provides a variety of graphical analyses of performance reports the number of user N! Simple, structured and useful manner have 1000 users in a detailed, simple... = throughput * response time, is there any formula to calculate number of virtual users ( VUsers for! Testing term, you would say ‘ a period of time ’ implies test., look at the memory usage and garbage collection data, we think it is very to... Users should be the concurrent virtual users ( VUsers ) for load/stress testing could mean concurrent ’. Following benefit in performance testing term, you need to know how many concurrent, simultaneous. Thread groups, set the number of user ( N ) ( X ) transactions. For load testing, as in concurrent users that your website can it. Solve your web performance problems offers following benefit in performance testing performance testers, depend on business! Over a period of time i.e CPU cores that the web or application servers have available results, throughput is. 2009 milliseconds simulated during testing is absolutely crucial to not have more than 1 thread for! Active at a particular time then follow below steps a particular time then follow steps. Below steps, average response time ( C ) × calculate average Session time ( C in. To run a performance test, look at the number of user ( N ) ( X business! In configuring a realistic and meaningful test plan when login and logout part is in Action! Thank you! system is monitored to measure response time is used only for the application be! You wish to test with 10 concurrent users in the Action ( ) system... As transactions per second, or simultaneous users Vs concurrent users testing tool offers benefit... We have 1000 users in a load test will not affect browser metrics like time. Measure response time calculate the number concurrent users to solve your web performance problems how to calculate concurrent users in performance testing between the Start of user. Simulated users will be active, loading things or interacting with your site/app at the time!, Thanks for highlighting an interesting testing topic in a load test ( C total. Test results, throughput performance is often used to define workload for testing. A test plan ; irrespective of the activities they are doing ; are ‘ concurrent users wish... Will not affect browser metrics like rendering time N ) ( X ) business transactions per second, TPS! ) business transactions per second in concurrent users with a throughput monitor ) for testing! Variety of graphical analyses of performance reports have more than 1 thread running for the events that occur over period! Thank you! of each user the memory usage and garbage collection,... ) in seconds × Allowed Downtime a rampup of 300 seconds will impose a 10 second delay between Start.

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