Oh and don't mind the other cynics in this forum, it's > time they get some serious therapy. … Recognizing the difference between total users and concurrent users is key in configuring a realistic and meaningful test plan. It seems like on every new project, there is a need to educate members of the project team on the difference between concurrent users and simultaneous users as it applies to load testing applications. Let’s say Medical Provider Incorporated (a fictitious company) has offices in Munich, New York and Los Angeles, and utilizes an electronic health record (EHR) application. In loadrunner concurrency between the user transactions can be achieved by introducing randomized think time (lr_think_time) and the end of transactions. This is expected. These parallel concurrent calls can be simulated in Loadrunner using web_concurrent_start & web_concurrent_end functions. (I would record the steps) Running the test with 100 concurrent users, use ramp-up 0, see: JMeter concurrent users count and JMeter understanding ramp up Concurrent users are the users who have a valid session in the server & they are performing the same operation at any point of time. Clock concurrent optimization (CCOpt) is a revolutionary new approach to timing optimization: it merges physical optimization into clock tree synthesis and simultaneously optimizes clock delay and logic delay using a single unified cost metric. However, “Common sense ain’t as common as it used to be”. You want 100 different concurrent users running a jMeter test at the same time, all these users run the same steps after each other. Simultaneous users are the users who have a valid session in the server. Second Approach This approach is going to tell us how many users we have on average. I even had a customer ask me for the number of simultaneous users and not the concurrent users. According to this blog post at least JMeter has some problems. I've had bad experiences with load testing tools (LoadRunner and JMeter) because those tools doesn't seem to simulate modern web browsers correctly. On the other hand simultaneous users are all active users which perform same task at a given point of time. Simultaneous = users executing the same code at the exact same time. The request will be send continuously without pacing. While I like to deal in tps, I incessantly get asked how many simultaneous users can our system handle. In addition, concurrent has a few additional meanings, most of which amount to "in agreement," as in "two people working concurrently." If we use concurrent user. They might be active and in-active. Indeed, since I haven't used this tool for a long time, some of my concepts are beginning to blur in my brain, and I'm just going through it in this way. I know there is "Use concurrent pool" setting in JMeter and you can simulate different browsers in LR, but what is your experience, are those really working like they should? Typically concurrency is … 1. JMeter vs LoadRunner. That means three things: Build a jMeter test for the steps. A common concern with named user licenses is that it would be financially wasteful in the event of an employee’s departure, but in fact users can be reassigned to different licenses as needed. Each of the users would be performing different actions like one doing login , other viewing the reports, etc. All the concurrent users would perform login, reports download, etc at the same point of time. The performance of these applications is tested by increasing the load on them and checking the maximum limit up to which they can work in an efficient and effective manner. Concurrent users are the users who have a valid session in the server & they are performing the same operation at any point of time. In Name license, NAV counts number of created users and compare it with your subscription license. Also since what users do usually takes time. Computer Science: Difference between Parallel and Concurrent programming?Helpful? LoadRunner skills have been sorted out 4, you have a certain doubt, these knowledge points, online everywhere. > Hope this narrows down the difference between Running, Concurrent and > Simultaneous users! The other meaning of concurrent is related to geometry, where you might say two lines were concurrent: they're going to intersect at a common point. Ok. Each of the users would be performing different actions like one doing login , other viewing the reports, etc. Since networks are serial, technically the maximum truly 'simultaneous' number of hits your site can get is equal to the number of network cards on the server, presuming each is fed by a different network. So if you have 30 users/minute, that means that over that minute 30 different users interacted with your site in various ways. So if your Web/HTTP Vuser takes 5MB when running as a process, 50 Vusers would take 250 MB. Notice that once all 25 concurrent users are logged in and doing work, the throughput stays fairly consistent. As adjectives the difference between simultaneous and concurrent is that simultaneous is occurring]] or [[transpire|transpiring at the same time while concurrent is happening at the same time; simultaneous. Simultaneous users are the users who have a valid session in the server. Each concurrent user will last for the duration of the script. How to calculate memory requirement for Vusers in LoadRunner. So, for lengthy transactions, a different sort of server is needed — the concurrent server, as shown in Figure 2.Here, Client A has already established a connection with the server, which has then created a child server process to handle the transaction. JMeter and LoadRunner are two different performance testing tools. What are different types of Loadrunner components? Concurrent users are the users who have a valid session in the server & they are performing the same operation at any point of time. > > > > > > > > On Tue, May 24, 2011 at 1:46 PM, Swaraj Gupta wrote: > > Hi, > > > It depends on the application and business processes in picture. Memory requirement also called as Memory footprint for a Vuser can be called as a function that is dependant on Vuser type (Web, CITRIX, SAP GUI); application and system where you intend to run the test.. Below are the LoadRunner throughput chart results for a 25-user test that I recently ran. 2. Simultaneous – each of the users will be in the system but will be performing different actions Concurrent – each of the users will be in the system and are performing same operation at any given point of time. Moreover tool licensing are planned in such a way that more the number of concurrent users you require, more is the cost of license. I have found out some of the things but still they are not exact difference making. Thus we need a better way of calculating the required load in such a way that the production load is met without increasing the cost of the tool (and thus the test). There are three components in Loadrunner: ... What is the difference between Simultaneous and concurrent users? Average Concurrent Users = Visits per hour / (60 min/hour / average visit. Simultaneous Users: When multiple users access a website and Perform the same action at the same time is called simontenious users. Users per minute means unique users within a period of time. As a noun concurrent is one who, or that which, concurs; a joint or contributory cause. LoadRunner – Difference Between Correlation Functions November 12, 2020 In my previous blogs, I have described all 5 correlation functions of LoadRunner in detail. LoadRunner : Concurrent Users Showing 1-7 of 7 messages. 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. When the application is a thick client (like Citrix, RTE, RDP, SAP GUI, Ajax true client, QTP) and needs a lot of client memory we have to run Vuser as process. I hope now you got some idea on difference between running vuser as process and a thread in loadrunner, now question was when we have to run Vuser as a process and Thread? Users per minute is different from concurrent users. 2. Here is one thing that should be common knowledge: simultaneous is an adjective, as Maeve wrote, but simultaneously is an adverb, just as she said. Concurrent Users: When multiple users access a website but perform different-different actions at the same time is called concurrent users. Concurrent CALs license individual users to access the application only while they are consuming one of the Concurrent CALs (making it unavailable for other individuals to access the application). To make users simultaneous LR has given "Rendezvous Point" feature. These dependencies make it difficult to predict the effects of trading users for requests per second. Can anyone tell me exact difference between all of this with example. Concurrent and simultaneous almost same and most of the times we don’t prefer concurrent users because there is no time gap, that is main purpose we are using simultaneous. Performance testing tools are tools in the software field by which different types of applications used in the software are tested. That is to say, they're working towards the same goal. All the requests of the elements in a web page are recorded in-between these concurrent group functions. Each office has 2,000 employees. Concurrent = users on the system using resources. Concurrent user licensing allows firms to purchase computer systems and software at a lower cost because the maximum number of concurrent users expected to use the system or software at any given time (those users all logged in together) is only a portion of the total system users employed at a company. The concurrent users are all users which is under one test plan irrespective of the task/activity they are performing. 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. This allows the server to process Client B’s request without waiting for A’s transaction to complete. Each workstation and user uses up one concurrent license, which means that two users on the same workstation and one user on two different workstations both use two concurrent licenses. Concurrent users: Concurrent users are connected to your test application and are all requesting work at some time intervals but not all at once and not for the same thing (same request or page). The concurrent licenses are global and shared by anyone who needs to use the system. Adjectives and adverbs have different uses. Now notice what throughput looks like on a test that did not perform as well as the last example. 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. Q14. So now I've been asked to find out how others deal with the simultaneous vs tps question. Thus making the simulation more realistic. 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