Thus, our test wouldn’t cover 300,000 users with 4,081 concurrent test users but 3,600 / 34 * 4,081 = 432.105 visits per hour. It’s always good to take the guesswork out of … Number of virtual users = 10 * 10 * 3600 / 600 = 600 Hence the above formula gives a user count of 600 users. Japanese / 日本語 Hence the users which are running under a test plan; irrespective of the activities they are doing; are ‘Concurrent Users’. If you now run these two visits simultaneously and independently from one another, you end up with two concurrent users. We prefer the term visit in this context and the person performing it is the visitor. Constant Arrival Rate: Users arrive as new visitors regardless of what is happening on the server side. Session: Technical term for a visit, basically the technical picture underlying it. Provided an equal distribution and an average visit duration of 49 sec, 300,000 users per hour that are often identified with visits (business-wise) in most cases, would result in the following: a user completes 3,600 / 49 sec visit duration = 73.5 visits per hour so that you end up with 300,000 / 73.5 = 4,081 concurrent visits aka real concurrent users at any given second. I have login date/time column A[.] Most of the time, we consider a scenario an isolated visit repeating the steps of the test case and thus using defined data (note that also random data is defined data). Croatian / Hrvatski Each store will have 4 users which constitute to 13680 total users. 2007-04-01 0:00 127. +49-3641-376300 When you have those two values you use this formula to calculate the number of concurrent users to use in your load test: concurrent_users = (peak_hourly_visits * average_session_duration) / 3600﻿ Feel free to comment below, whether affirmative or critical. How do we calculate number of concurrent users for a fresh eCommerce application which is not in production? Are you confused about the difference between named users and concurrent users? So now with how many concurrent users … So lets say a max of 25000 users concurrently are on your server, then user 25001 tries to access site he would reach server busy message. Bosnian / Bosanski Thanks a lot for such a descriptive information. (total monthly users)/ (30 days a month * 15 hours a day * 4 {note, 60min/15min per user} = daily average concurrent user load. Note that the notion “user” is actually not the exact right term as we’re talking about concurrent visits here. With respect to our simulation period of 1 hour, we get a new session (begin of a visit) every two seconds on the server side – 3,600 sec / 1,800 visits as our visits are equally distributed. Turkish / Türkçe 4,081 concurrent visits produce 4 page views in 49 sec (visit duration) each, that is in 49 sec we have 16,324 page views, thus 333 page views per sec (see next paragraph). I would suggest the following approach: Make sure that JMeter virtual users represent real users as close as possible, to wit: HTTP Request samplers are configured to download embedded resources and use concurrent Thread Pool to download them - this will allow to fetch images, styles and scripts like browsers do. Chinese Traditional / 繁體中文 Kazakh / Қазақша As each page view has a runtime on the server, let’s say 1 sec, one visit takes at least 4 sec. When the server is too slow, new users will still try to come in. Page view or page impression: A single complete page delivered due to a request of an URL; in a world of Ajax, intermediate logical pages can be considered an impression or view. Representation of test cases meant to be run as load tests. We know the total user base (1,20,0000 users) and number of users who will access the application in an hour say 10,000 users in an hour. Consists of one or more page views. You can calculate concurrent users from Google Analytics account. Macedonian / македонски tl;dr — This post is about using Google Analytics to determine how many concurrent users to specify in your load tests. Why do you divide your users by 8 hours? Greek / Ελληνικά Visit: In general, a visit occurs when you send a request to a server and, as a response, the website you requested is displayed. IBM Knowledge Center uses JavaScript. (aud * v) / p = cu (600 [10 minutes in seconds] * 500 [sessions in 1 hour]) / 3600 [1 hour in second] = 83.33 [concurrent users] You can also use the calculator below if you would prefer. Has a duration starting with the first page view and ends with the last. You simply add capacity until you meet the requirements. Suppose we have 1000 users in application but we are interested in concurrent users. It’s only 3 think times because there’s none after the last click that terminates the visit. Both of our visitors execute 4 page views each, thus resulting in a total of 8 page views. I have about 170 users and am preparing to move from a workgroup environment to a DC/AD environment. A second execution of the test with all data and connections (cookies, HTTP-keep-alive, and browser cache) having been reset would result in another visit. Hi, I do not understand requirements. Vietnamese / Tiếng Việt. when i look for results using CCUEVAL report it show only 15 users. In the performance testing term, you would say ‘a period of time’ implies ‘test duration’. To arrive at the number of logged in users, let’s say 95% of clerical users and 33% of query users are logged in at once, therefore: (1,500 x .95) = 1425; (500 x .33) = 165; Total logged in users = 1,590. Why do different suppliers price software licenses in different ways? Steady Load: Runs a fixed number of users that wait for the server, for instance, when it has long response times. There is no methodical way. If the server can handle the load, the system runs stable and you just need your user number x (according to our calculation, 4,081, for example). So we’ll apply some statistical logic to arrive at a realistic number of concurrent users for a peak load test. Each concurrent user will last for the duration of the script. In the worst case, you can’t test at all now because each test run leads to a different result. Without any think time you would therefore need 333 users for the simulation. Think time: Time period between two page views of a visit. 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. +49-3641-55944-0. 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. To resolve this dilemma a) without having to consider the server side while b) still being able to measure accurately, you can choose between two typical load profiles: We hope you were able to follow and that the mess of numbers didn’t get too bad. Since Xceptance focuses on the internet and e-commerce, illustrations and examples will mainly refer to webshops; keep in mind, though, that the topic isn’t restricted to the domain of e-commerce load testing. Most users do not need to access a file server and most accesses will not be concurrent, although the shared folders will remain on their desktops. Report Inappropriate Content. And logout date/time Column B. Download the example Excel file "log summary.xlsx" [1]. Chinese Simplified / 简体中文 At times, the concurrent user topic is getting downright absurd… Feel free to comment, any remark is appreciated. If we now have a visitor repeat that for an hour, we’ll end up with a user completing 3,600 sec / (49 sec per visit) = 73.5 visits per hour. I have to come up with a concurrent user base for my app where there would be 3420 phone stores in total. Although we cannot explain the rhyme or reason behind every software vendor’s pricing practices, we can offer an explanation of the difference between both and provide a template to help initially calculate your named versus concurrent users. Norwegian / Norsk As soon as you say you have a number of x visits that could vary in their duration, you end up with a higher maximum number of visits you need to support but that you actually don’t want to test. Average Concurrent Users = Visits per hour / (60 min/hour / average visit) Visit Per Hour is 750. Finnish / Suomi On the server side, both will result in the identical number of visits per time period, the identical number of page views, etc. What we want to emphasize here is that a temporal dimension is absolutely necessary. In this blog we share some of our stories and experiences, and give you insights into the world of software testing. French / Français Just look at the user here as the load test execution engine repeating that independently of other “users”. Concurrent Users: The word concurrent is used only for the events that occur over a period of time i.e. Concurrent Calculator Concurrent Service is used to identify a member who has two contracts with one employer. In the worst case (note that 1 page view takes 1 sec on the server side), however, this would amount to 100 * 3,600 sec = 36,000 page views per hour. The arithmetic mean would still be 15 sec. Concurrent User: We don’t exactly know about them yet…. Portuguese/Portugal / Português/Portugal The requirement of 300,000 users would always imply they could click simultaneously which would produce 300,000 visits at one blow. Of course, a single user would never repeat a visit that many times. Even if you keep the think time for 4,081 users at a constant level, the traffic wouldn’t be as synchronous as you planned it to be in the beginning. Arabic / عربية Romanian / Română A visit would now take (4 page views each takes 1 sec) + (3 think times each 15 sec). How to determine concurrent user counts from apache logs. Prabhjot. So for me to guess the concurrent users on a peak hr, am doing below math. Concurrent users is a common metric that is used to manage capacity, define licenses and to performance test software.The following are illustrative examples of concurrent users. Concurrent user licensing is often much more affordable than total/named user licensing, especially when users only need to access to the system once in a while. Since the requirement of 100 concurrent users is actually never bound to a certain period, you therefore have to assume that these users could potentially click at any time. Spanish / Español Regarding the final result, the simulation of 4,081 users and 15 sec think time therefore equals the simulation of 333 users without think time. Thank you !! Concurrent Users: Concurrent users would be the total number of named users accessing the system simultaneously (concurrently). Jena, Germany – Headquarters If for example both schools are under Local Authority (LA) control but one has an outsourced payroll, this can present problems when they submit their Monthly Return. Dutch / Nederlands Scenario: The course of a visit in terms of a use case (for example, to search something, to order something, or both). If the requirement was the simulation of 1,800 visits per hour and 7,200 page views per hour, we could now randomly pick a think time and by doing so, determine any number of concurrent visits aka users between 2 and x. In this article, we will provide a list of the top 7 Wi-Fi access points supported by Tanaza to connect the largest possible number of concurrent users under heavy data traffic usage. If we want to test 1,800 visits again, we need 1,800 visits / (73.5 visits per hour per user) = 24.5 users, about 25. The Role of Concurrent Users in Load Testing. Why is So here how can I calculate the concurrent users. The exact same traffic? 2007-04-03 2:00 132. Bulgarian / Български We are Xceptance and we are dedicated experts for software testing. Oh, and needless to say that 42 is always a good number of concurrent users… ;-). Actually i have been told to calculate concurrent users day. This way you can’t reach the desired number of visits because users depend on the server’s response behavior. For more information please read our privacy section. Once you have those key pieces of information you can use the following formula to calculate the concurrent users. We just said “if one user repeats”. Are these four users per store per 8 hours and they come in at any time? You may raise some objections to this and they are actually valid since, in reality, the think time would never be exactly 15 sec and the response time would never always be 1 sec. Click the “Reporting” tab. "Hourly Sessions x Average Session Duration (in seconds) / 3,600" is the formula we recommend to get started. You can calculated concurrent users with the following formula. for a span of time. The profile is suitable for controlled measurements. Edwer Fang [MSFT] MSDN Subscriber Support in Forum If you have any feedback on our support, please contact msdnmg @ microsoft.com Please remember to mark the replies as answers if they help and unmark them if they provide no help. Today’s article is meant to shed some light on the concurrent user metric and the misunderstandings and myths surrounding it. Polish / polski With respect to our example, let’s assume the think time to vary between 10 and 20 sec. Search Thus, you decide on the most typical ones at first and make a scenario out of them afterwards. kontakt@xceptance.de Is there any formula to calculate the number of concurrent users for Load Test? While many customers understand the value of a load test as part of their holiday preparation, many might still have questions about specific parameters that factor into testing their websites.This blog post will discuss the concept of concurrent users as it applies to load testing. The users have to go through the following steps to completely cover the scenario: The first challenge is choosing the content for the single actions, that is should we always go for the same product, the same catalogue, should the number of items or the size of the cart vary, etc. Together we comprise more than 200 years of software testing experience and we absolutely love what we do. However, if the users aren’t simultaneously active aka started a visit, they aren’t concurrent users anymore and then you don’t need to simulate them in the first place. Then you focus on stability and a predictable way of “decline”. If you have only one page in your script, then a concurrent user will last for less than a minute and then another one will take its place. So what should be the user load that we can achive in LoadRunner scenario . Note that our sole focus is set on the load and performance test here. Let’s assume three scenarios: a visitor that is just looking (Browsing), a visitor that puts products into the cart (Add2Cart), and a visitor that checks out as a guest and wants their ordered items to be shipped to an address (Order). If the system delivers what it should, the test may expand in its width aka both the think times and the number of concurrent users go up. (concurrent users) x (requests per user per minute) = total requests per minute. 59.0172 / 720 (30 days in November x 24h per day = 720) = .08 average concurrent users in November. Most of you probably know the term Concurrent User. 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. We also use analytics. These 25 users need to complete their visits simultaneously and in parallel but still independent of one another. Only these three scenarios offer infinite possibilities of variation already. If there are problems on the server side, then the user number automatically increases to x + n (for example, to a total of 10,000 users). Scripting appears to be disabled or not supported for your browser. Czech / Čeština 10:1 Ratio for Casual/Occasional Users. We use cookies. I am trying to calculate the number of concurrent user for each hour. Let’s start with a couple of key terms to help you understand what we’re talking about: A load test wants to reflect present load conditions or anticipated load conditions. Now, the majority of users isn’t that fast, of course, which is why usually think times get included. Average Visit is 1.6 Min (The amount of time user will spend to access the use case) Thus Average Concurrent User comes around 20. May be after 1 or 2 hour these users will be there on the site and then it goes down. Concurrent users on your web server relates to typical Concurrent user nodes the server allows at max at any one time. Italian / Italiano That means you need to define target numbers you want to support, or measure what the server is currently able to deliver. Hebrew / עברית But let’s stick with the basic steps and the simple Browsing for now. God bless, https://perfmatrix.blogspot.in/2016/11/no-of-usersthread-calculator.html. We now have 25 concurrent users that produce the exact same traffic simulation as 2 users without a think time. Hungarian / Magyar Request: Submission of a request to a server, in the case of web applications mostly via HTTP/HTTPS protocols. I dont know the average time spent by a user on site yet. German / Deutsch Login to Google Analytics account. I'm trying to get distinct users by hour on a website using Logparser. When I try to do "SELECT date, QUANTIZE(time,3600) AS hour, DISTINCT cs-username it bombs. This is a limit at any one time at once. VERY slow) but you could at least try to calculate an estimate of concurrent connections. Russian / Русский What happens now results in the following calculation: In the worst case, the duration of all visits is only 4 sec + 3 * 10 sec = 34 sec. Thai / ภาษาไทย In terms of page views without think times this means: 300,000 users are 1,200,000 page views (for our example above). On one hand, small businesses will overestimate the number of concurrent user licenses they should be purchasing because they do not know or understand the distinction between “concurrent users” and “named users.” Accordingly, our visit duration is 49 sec. by Donald Lee. Korean / 한국어 This way you can also test the overload behavior at the same time. Second way is you can count the number of rows in the v\$session dynamic view. 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From apache logs simultaneously which would produce 300,000 visits at one blow each hour 720. Up with a how to calculate concurrent users from total users time period of 1 to 30 minutes average session duration ( in seconds /...
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