Today’s article is meant to shed some light on the concurrent user metric and the misunderstandings and myths surrounding it. 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. Can lead to further technical requests (HTML, CSS, Javascript, images etc.). Spanish / Español 4,081 concurrent visits produce … In the performance testing term, you would say ‘a period of time’ implies ‘test duration’. The profile is suitable for controlled measurements. "Hourly Sessions x Average Session Duration (in seconds) / 3,600" is the formula we recommend to get started. 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). Certain types of SpendMap users only … So this means 2000 concurrent users are there on the website. I have login date/time column A[.] Session: Technical term for a visit, basically the technical picture underlying it. How do we calculate number of concurrent users for a fresh eCommerce application which is not in production? We are Xceptance and we are dedicated experts for software testing. 59.0172 / 720 (30 days in November x 24h per day = 720) = .08 average concurrent users in November. There’s a myriad of ways you can go to explore a webshop. For example, if you run a load test with 10,000 virtual users, each making a request every 20 seconds (3 requests per minute), then you're making 30,000 requests … 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. Catalan / Català I am trying to calculate the number of concurrent user for each hour. French / Français If you want 100 concurrent users during the load test duration, it seems you have already known it as you mentioned above, like achieve user load to 1000. Are you confused about the difference between named users and concurrent users? Thus, you decide on the most typical ones at first and make a scenario out of them afterwards. In the ideal case, that means you only need 4,081 users but when the server behaves unexpectedly, up to 10,000 users will be activated. Swedish / Svenska However a noticeable point is in an hour a user runs for … It’s only 3 think times because there’s none after the last click that terminates the visit. 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. Search in IBM Knowledge Center. 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. The requirement of 300,000 users would always imply they could click simultaneously which would produce 300,000 visits at one blow. 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.” 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). All tests that are normally run at first, which is absolutely correct, are tests that want to identify or verify the good case. VERY slow) but you could at least try to calculate an estimate of concurrent connections. Let’s assume a think time of 15 sec for our example. Most of you probably know the term Concurrent User. (total monthly users)/ (30 days a month * 15 hours a day * 4 {note, 60min/15min per user} = daily average concurrent user load. 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. Now, you may want to argue that they aren’t coming simultaneously. 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. Constant Arrival Rate: Users arrive as new visitors regardless of what is happening on the server side. So we’ll apply some statistical logic to arrive at a realistic number of concurrent users for a peak load test. 10:1 Ratio for Casual/Occasional Users. 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. 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. 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. kontakt@xceptance.de Concurrent users is the total number of people who use a service in a predefined period of time. Vietnamese / Tiếng Việt. Oh, and needless to say that 42 is always a good number of concurrent users… ;-). Only these three scenarios offer infinite possibilities of variation already. 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. 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. Concurrent Users: Concurrent users would be the total number of named users accessing the system simultaneously (concurrently). Actually i have been told to calculate concurrent users day. 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. And logout date/time Column B. Download the example Excel file "log summary.xlsx" [1]. English / English Select “Audience” from the sidebar menu. Together we comprise more than 200 years of software testing experience and we absolutely love what we do. This is a limit at any one time at once. Concurrent User: We don’t exactly know about them yet…. God bless, https://perfmatrix.blogspot.in/2016/11/no-of-usersthread-calculator.html. 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. Italian / Italiano Prabhjot. From this point of view, you’ll soon realize that the number of concurrent users can basically mean anything: much traffic, little traffic, little load, much load. Requested content may be HTML, CSS, Javascript as well as images, videos, Flash, or Silverlight applications – HTTP can deliver almost everything. Note that the notion “user” is actually not the exact right term as we’re talking about concurrent visits here. I have a question interms of my requirement. Slovenian / Slovenščina Visit and session are often used synonymously. Croatian / Hrvatski This way you can’t reach the desired number of visits because users depend on the server’s response behavior. There will be around 200 logins per day, in that i need to calculate concurrent logins per day. for a span of time. Kazakh / Қазақша Consists of one or more page views. 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. Only by knowing the test cases and additional numbers such as visits and page views per time unit can you a) define a number of concurrent users and b) check each number by means of calculation against the other numbers. Macedonian / македонски Hence the users which are running under a test plan; irrespective of the activities they are doing; are ‘Concurrent Users’. Hebrew / עברית The average think time currently amounts to something between 10-20 seconds, depending on the web presence. We also use analytics. With the restriction to 333 users with none or just minimal think time, you restrict the “movement” of the system at first to measure it. For more information please read our privacy section. Portuguese/Portugal / Português/Portugal In terms of page views without think times this means: 300,000 users are 1,200,000 page views (for our example above). (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. 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. 2007-04-03 2:00 132. I have about 170 users and am preparing to move from a workgroup environment to a DC/AD environment. Scenario: The course of a visit in terms of a use case (for example, to search something, to order something, or both). Hi, I do not understand requirements. Visit: In general, a visit occurs when you send a request to a server and, as a response, the website you requested is displayed. Concurrent Users: The word concurrent is used only for the events that occur over a period of time i.e. But this will include the connections of oracle background processes etc. You simply add capacity until you meet the requirements. 0 Likes Reply. 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. 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. Two concurrent visitors result in 1,800 visits in total leading to an overall total of 1,800 visits x (4 page views per visit) = 7,200 page views. 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. With respect to our example, let’s assume the think time to vary between 10 and 20 sec. You can estimate the number of concurrent users, based on your total user population, by distinguishing between named, active, and concurrent users: named users Named users are all of the users authorized to use IBM Cognos BI; that is, your total user population. Without any think time you would therefore need 333 users for the simulation. Each concurrent user will last for the duration of the script. 2007-04-01 0:00 127. Thus, you need to complete 1,200,000 page views / 3,600 seconds = 333 page views per second. 2007-04-02 1:00 121. The starting and peak number of virtual users in LoadStorm represent concurrent users or the number of simulated users at a particular point in time. The number of page views stays the same since 1 visit equals 4 page views and the number of visits is constant. German / Deutsch So here how can I calculate the concurrent users. With that said, your user count is very low. Are these four users per store per 8 hours and they come in at any time? 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. Steady Load: Runs a fixed number of users that wait for the server, for instance, when it has long response times. Thai / ภาษาไทย I'm trying to get distinct users by hour on a website using Logparser. You'd need to sort the file by %t then go through each record working out the overlap. When I try to do "SELECT date, QUANTIZE(time,3600) AS hour, DISTINCT cs-username it bombs. Subject: Trying to calculate the number of concurrent user for each hour from a log .csv file. Why is Thank you !! 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. It is usually calculated with a short time period of 1 to 30 minutes. Korean / 한국어 We just said “if one user repeats”. You can calculated concurrent users with the following formula. But let’s stick with the basic steps and the simple Browsing for now. 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. 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. With 34 sec, our server now has to deliver as many visits and page views as it delivered within 49 sec before. It used to be 40 seconds but today’s users are more experienced and user guidance has improved a lot so that they can navigate through a website much faster. Concurrent Calculator Concurrent Service is used to identify a member who has two contracts with one employer. I don't have any idea that which is best way to calculate concurrent logins per day (i.e claculating hourly concurrent logins per day and then averaging or calculating Max no of concurrent logins in any hour.) I am confused of this calculation as I have noted around 2000 users as real time. Both of our visitors execute 4 page views each, thus resulting in a total of 8 page views. 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. 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. There is no methodical way. Japanese / 日本語 Then you focus on stability and a predictable way of “decline”. 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. Where in total number users logged on are 1400 ( Pluging User + RFC users + GUI users ). 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. Now, the majority of users isn’t that fast, of course, which is why usually think times get included. Once you have those key pieces of information you can use the following formula to calculate the concurrent users. +49-3641-376300 It’s always good to take the guesswork out of … We now have 25 concurrent users that produce the exact same traffic simulation as 2 users without a think time. 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. Bosnian / Bosanski If you want to measure the server side beyond the maximum “good” case, you don’t aim at the performance anymore but at the overload behavior. You can also question the numbers by approaching the problem from another perspective: if 100 users are simultaneously active, then they can simultaneously request 100 page views. 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. +49-3641-55944-0. Jena, Germany – Headquarters At times, the concurrent user topic is getting downright absurd… Feel free to comment, any remark is appreciated. What we want to emphasize here is that a temporal dimension is absolutely necessary. The exact same traffic? Something like below: Day Hour Total. Russian / Русский Now I made some performance … When testing against a server, the single running of Browsing would be a visit consisting of 4 page views and possibly further requests for static content. By clicking Opt-Out, we will place a non-personalized cookie on your machine that indicates that you don‘t wish to be tracked. 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. Accordingly, our visit duration is 49 sec. Thanks a lot for such a descriptive information. Request: Submission of a request to a server, in the case of web applications mostly via HTTP/HTTPS protocols. So, should that be my max concurrent user number i should target on? Enable JavaScript use, and try again. 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. Ask Question Asked 9 years, 11 months ago. Each store will have 4 users which constitute to 13680 total users. In the worst case, you can’t test at all now because each test run leads to a different result. You want to know if you can cope with the traffic x where you assume x to be a constant worst case that applies to a longer period of time. Number of virtual users = 10 * 10 * 3600 / 600 = 600 Hence the above formula gives a user count of 600 users. In this blog we share some of our stories and experiences, and give you insights into the world of software 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. 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. Serbian / srpski 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. Slovak / Slovenčina Scripting appears to be disabled or not supported for your browser. Concurrent users on your web server relates to typical Concurrent user nodes the server allows at max at any one time. 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). Chinese Traditional / 繁體中文 Note that our sole focus is set on the load and performance test here. Portuguese/Brazil/Brazil / Português/Brasil 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. Dutch / Nederlands Average Concurrent Users = Visits per hour / (60 min/hour / average visit) Visit Per Hour is 750. Hungarian / Magyar by Donald Lee. Has a duration starting with the first page view and ends with the last. These 25 users need to complete their visits simultaneously and in parallel but still independent of one another. 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). Therefore, if one user repeats their visits for one hour, he or she completes 3,600 seconds / (4 seconds per visit) = 900 visits / hour. 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. (concurrent users) x (requests per user per minute) = total requests per minute. The Role of Concurrent Users in Load Testing. So for me to guess the concurrent users on a peak hr, am doing below math. On the server side, both will result in the identical number of visits per time period, the identical number of page views, etc. Feel free to comment below, whether affirmative or critical. We use cookies. Czech / Čeština Polish / polski You can do it using HTTP Request Defaults Why do you divide your users by 8 hours? 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. 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. We prefer the term visit in this context and the person performing it is the visitor. Suppose we have 1000 users in application but we are interested in concurrent users. Report Inappropriate Content. That means you need to define target numbers you want to support, or measure what the server is currently able to deliver. when i look for results using CCUEVAL report it show only 15 users. When the server is too slow, new users will still try to come in. Finnish / Suomi Just look at the user here as the load test execution engine repeating that independently of other “users”. This is where coincidence comes into play. I dont know the average time spent by a user on site yet. IBM Knowledge Center uses JavaScript. Login to Google Analytics account. You can calculate concurrent users from Google Analytics account. Norwegian / Norsk How to determine concurrent user counts from apache logs. As each page view has a runtime on the server, let’s say 1 sec, one visit takes at least 4 sec. 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. Arabic / عربية 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). 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 Bulgarian / Български Turkish / Türkçe Chinese Simplified / 简体中文 Search The arithmetic mean would still be 15 sec. So what should be the user load that we can achive in LoadRunner scenario . If you now run these two visits simultaneously and independently from one another, you end up with two concurrent users. Danish / Dansk In either case, it’s impossible for a load test to cover all eventualities and be economical at the same time. 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. Click the “Reporting” tab. tl;dr — This post is about using Google Analytics to determine how many concurrent users to specify in your load tests. A visit would now take (4 page views each takes 1 sec) + (3 think times each 15 sec).

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