If it is added at the Test Plan level then it acts as a global timer and the delay is added for all the samplers before the process. The application. Select it and you. 1000 and slowing the requests down using Constant Throughput TimerI've set up a jmeter distributed testing setup with one master and multiple slaves. I have implemented a different solution, inspired by Jmeter's constant throughput timer. Constant Timer with a Thread Delay of 5 milliseconds. 1. 0 requests/minute is saved as 0. I used 80 threads and set a Constant Throughput Timer and Variable throughput timer and i set 10 transactions per second and i when i get Jmeter logs i see max 4 transactions per second . 线程组线程数设为10. Throughput Shaping Timer Properties. JSR223 Timer. Remember - if the application itself is not supporting the desired throughput, jmeter can not help here. Use 0 for truly random delays and a positive integer for constant. See Also: Serialized Form. Ori Marko Ori Marko. This is "closed workload" approach, and it has major drawbacks (see here why). So you must supply enough threads in the Thread Group to create more requests per second than you're trying to achieve and then limit the number of requests per second to the desired rate using Constant Throughput Timer. "Throughput depends on response time. Constant Timer or Gaussian Random Timer or Uniform Random Timer or whatever. e. GitHub Repo: that the most simplest ways to control throughput in your tests is using either standard "out-of-box" Constant Throughput Timer or custom Throughput Shaping Timer from jmeter-plugins collection. Let’s think about an end-to-end scenario for an e-commerce website. This timer generates Poisson arrivals with constant throughput. This is the function of Constant Throughput Timer. I would suggest going for Constant Throughput Timer. I think the documentation was before Ultimate Thread Group was introduced. 3. If you have 10 virtual users which can be executed at rate of 10 requests per second you will not be able to reach 20 requests per second without. See Also: Serialized Form. A constant throughput timer in JMeter is used to achieve the actual output by computing the total number of requests. JMeter configuration and start from the command line. Constant Throughput Timer : The Constant Throughput Timer is like the Precise Throughput Timer, except that it has fewer settings. I am searching how to increase the number of sent requests per second . HTTP Cache Manager must be included in your test plan if you have enabled your HTTP sampler to “Retrieve All Embedded Resources”. jmx: JMeter project file. Constant throughput timer not working properly. How to Use “ Constant Throughput Timer ” in JMeter Loadium · Follow 3 min read · Feb 22 Let’s think about an end-to-end scenario for an e-commerce website. HTTP Sampler ii. Listeners, may be placed directly under the test plan, in which case they will apply to all the thread groups. 0 (exclusive) Multiplied by “Random Delay Maximum”. Constant Throughput Timer is only capable of pausing JMeter threads in order to limit the number of requests per second to the given value. 2. On top of that, it tries to maintain the exact amount of arrivals for a given timeframe ( throughputPeriod ). It is not even reaching 14 (well, except once)Irrespective of how much time the previous request took, it will apply the remaining time. Just to recall in terms of Apache JMeter the meaning of Throughput is ‘requests per second’ or ‘samples per second’ send to the server by JMeter. This timer tries to maintain a constant throughput throughout the test and achieve the target. ), you can do this using i. In planning our load tests, our goal is often to measure whether or not our application (not just the. apache. The Throughput Shaping Timer plugin adds the following features to JMeter: The Throughput Shaping Timer element - a timer that sets the desired RPS schedule via the JMeter GUI. Use CTT in Test Plan level,not in thread group level. Precise Throughput Timer. Share. As I can see, Constant Throughput Timer ensures requests completion rate (for example, if I specify "2" in the timer, it will slow down the thread so that 2 requests are finished per minute) My test plan with Constant Throughput Timer. Constant Throughput Timer config: Target Throughput is 600. Alternative options are: JMeter also provides a useful timer component to configure or set a constant throughput value to test the application load. First of all try increasing the number of threads. Here is my script detail:->Simple Login request. Synchronizing Timer: mình đã nói ở bài viết Nhiều user thực hiện một hành động đồng thời trên jmeter; Constant Throughput Timer: có vẻ giống với Synchronizing Timer, mình chưa dùng bao giờ. Constant Throughput Timer. It means that you have to implement the thread delay logic by yourself using one of the supported scripting languages. Essentially, it sticks with a target throughput very closely, and doesn’t allow for the flexible. Test execution result will looks like below for constant throughput timer jmeter example. For further detail check JMeter blog about Constant Throughput Timer. so I used a ultimate thread group and set the threads to 200 and ramp up was 200seconds. Tell JMeter to parse the HTML file and send HTTP/HTTPS requests for all images, Java applets, JavaScript files, CSSs, etc. JMeter User Defined Variable for enabling Test Duration. ThroughputController. I think that you're misusing Constant Throughput Timer. java:131. To apply a timer to a single sampler, add the timer as a child element of the sampler. 1. First of all try increasing the number of threads. Using a uniform random timer allows you to pause the test execution for a random time, where you can. Total Http Requests - 24, Total Http Request/min - 12, Test Duration 2min, Waiting. Concurrency depends on your test plan and application response time. This timer tries to maintain a constant throughput throughout the test and achieve the target. Hướng dẫn sử dụng Timer trong JMeter – Add Precise Throughput Timer 2. You can use Constant Throughput Timer or Throughput Shaping Timer in order to limit JMeter's throughput to the given numbers and see whether it will be able to complete 10k requests in 1 hour or not. Other elements, e. You can see that Start time difference between 1st request and 41st request is 1 minute. 7. Figure shows, Constant Throughput Timer for 60 requests per. . If you want to execute 300 000 queries in 24 hours you need to introduce a rate limiting on JMeter side to execute 208. new_throughput – new intensity value, op/min. Constant Throughput Timer is used for pausing the threads to slow down overall execution speed to reach the target throughput. Uniform Random Timer. Let’s think about an end-to-end scenario for an e-commerce website. Throughput of 300 requests per minute gives 300/60 = 5 requests per second Constant Throughput Timer works on minute level so make sure that your tests lasts longer than 1 minute; Each JMeter thread representing virtual user executes nested samplers upside down, when. Hot Network QuestionsThe formula is: Throughput = (number of requests) / (total time). One widget at a time is passed through a machine that stamps it with a label. If you set its value as “1. throughput property as: ${__P(throughput,)} "tell". By default each JMeter thread executes samplers as fast as it can. 1. Figure 01: JMeter Timer Elements Scope of JMeter Timer: 1. 0. You need to run Sampler(s) at rate of 600 per minute so this is what you need to specify in the Constant Throughput Timer. control. You can use Constant Throughput Timer or Throughput Shaping Timer in order to limit JMeter's throughput to the given numbers and see whether it will be able to complete 10k requests in 1 hour or not. Other timers may impact constant throughput timer target, so it is recommended not to use other timers. You can consider switching to Concurrency Thread Group and Throughput Shaping Timer. July 1, 2023 by PerfMatrix. But if I place my requests in separate Thread Groups - Throughput Controller doesn't work. A user logs in, goes to the main page, searches for a product, sees. 1. JMeter: Holding Session for a certain. One of the most commonly used timers in JMeter, the Constant Throughput Timer enables you to decide how many samples should be executed per minute. I want to measure the response time of this 100 users login which I've. It seems that the Constant. Constant Throughput Timer; Don't use GUI to run JMeter tests as it might have very negative impact on test results, JMeter GUI is only for tests development and. That means 40 samples has been executed in 1 minute. If you want 30 transactions in total as fast as it possible - set the number of loops to the 30. Subscribe. The following article provides an outline for JMeter Throughput. So you need to supply the sufficient amount of threads in the Thread Group. I am using a Constant Throughput Timer with "Calculate throughput based on: all active threads in current thread group" selected. Do not select "This thread only" value for Timer added at root, as it will change the result. jsr223 request Constant Throughput Timer - 100 rpm. 6. at org. As the name implies, the thread group element controls the number of. This way, You can use constant throughput timer in your load test plan to. Test Plan. Constant Timer adds a delay after the request completes (not after start), which doesn't fit either. Open your JMeter script and right click on Thread Group. I have tried with below jmeter tools. Since: 4. You can consider switching to Concurrency Thread Group and Throughput Shaping Timer. Khi đó bạn sẽ cần sự trợ giúp từ hàm _Ramdom của JMeter. In my GET Thread Group I have added a bean shell processor- to convert the access token into a JMeter Property via __setProperty() function. Throughout the Hold Load time(180sec) the requests will be looped. The Throughput Shaping Timer plugin adds the following features to JMeter: The Throughput Shaping Timer element - a timer that sets the desired RPS schedule via the JMeter GUI. The constant throughput timer delays the request to ensure that JMeter does not perform more requests than specified. -> Ultimate Thread Group: Start Thread Count-100 ->Startup time-120 ->Hold load for-120 ->Shutdown Time-60 -> Constant Throughput Timer- Target Throughput(1200/min). Use CTT in Test Plan level,not in thread group level. This is "closed workload" approach, and it has major drawbacks (see here why). If you get response times comparable to what you see in Fiddler. For the given scenario in sample scenarios image with duration 1hr , i tried to set the work load model as given below with the request hits 40000 and TPM 667:. Issue: If i run the test, I was expecting the min throughput of 15 requests/sec - upto 16 requests /sec. For each thread, the variable will be assigned one of the values from the series in sequence. However, a couple of advantages are the request bursts are more consistent in nature, and the samples lie very close to the median value, as can. The constant timer is the basic timer among all the given ones. If you change the Constant Timer is zero, you will see the result is changed. 4. Uniform Random Timer. In this case, we are using a JMeter plugin – Throughput Shaping timer. With Constant Throughput Timer you can only pause JMeter throughput (number of requests per minute) to the desired rate but it works precisely enough on minute level, if you need second-level. Every timer has its own usability. JMeter Constant Timer, Constant Throughput Timer. These sample results have various features like data size, elapsed time, etc. 2. รวมถึง. Poisson Random Timer. If we were to add a Constant Timer to the test and set the delay to be 2000 milliseconds. The main goal of. Testing without a JMeter timer can create irregular test results because the simulated requests will come in a different pattern than. Add Constant Throughput Timer . It pauses the execution of test for a specified. JMeterは一般的にWebシステムに一定のアクセス負荷をかける試験ツールです。 通常機能ではアクセス負荷量の上げ下げが困難ですが、外部ライブラリ(Throughput Shaping Timer)を組み込むことでグラフィカルかつ簡単に実現できたので紹. All controllers and samplers must be under a thread group. To implement pacing in Apache JMeter™, we can use either use Groovy Scripting or one of these two timers: the Constant Throughput Timer or the Throughput Shaping Timer. 1) with Constant Throughput Timer value as 1200/min with "All active threads" and Timer added at the root of script. 2. The above configuration will add a 5-second delay before the execution of each sampler, which is in the Constant Timer’s scope. Precise Throughput Timer is more "precise" but a little bit harder to use as you need to provide controlled throughput. This is what we need to control request frequency. 1 Answer. และเราสามารถใช้ Constant Throughput Timer ในการกำหนดจำนวน request ต่อนาทีที่เรา. Then extract the file and run JMeter: $ tar -xf apache-jmeter-5. As per documentation: Set Target Throughput = 40. Constant Throughput Timer (bộ hẹn giờ thông lượng không đổi) được sử dụng như một yếu tố định hướng mục tiêu giúp đạt được thông lượng mong muốn (tổng số yêu cầu). JMeter Constant Throughput Timer Example. The constant timer pauses the test execution for a constant period. Oct 10, 2022 at. Example: If Constant Delay Offset is given 1000 and deviation is given 200 then Gaussian Random Timer will generate the random number in the range. The total number of threads in the Ultimate Thread Group will be 250. For different time of the day I'd use a different throughput value. After that, we need to add the constant throughput timer, so first, we need to right-click on sample-> select Timer, and inside we need to click on Constant Throughput Timer and set the constant throughput timer as per our requirement. The Uniform Random Timer pauses the thread by a factor of: The next pseudorandom uniformly-distributed value in range between 0. 在JMeter中定时器用来设置延时和同步，以调节请求的发送速率，那么如何产生固定吞吐量的压力哪？可以使用常数吞吐量定时器(Constant Throughput Timer)来实现。 下面举例来看看如何做到以固定吞吐量发送请求，创建…Tool ที่เราใช้ในการทำ performance test ก็คือ JMeter ซึ่งเป็น tool opensource ที่เขียนด้วย Java. La principal diferencia entre estos dos temporizadores esta en que el CTT inserta un pausa constante mientras que el CTT. Some commonly used JMeter Timers are: Constant Timer; Uniform Random Timer; Precise Throughput Timer; Constant Throughput Timer; Gaussian Random Timer; JSR223 Timer; Poisson Random. JSR223 Timer. JMeter Constant Throughput Timer Example. Synchronizing Timer: mình đã nói ở bài viết Nhiều user thực hiện một hành động đồng thời trên jmeter; Constant Throughput Timer: có vẻ giống với Synchronizing Timer, mình chưa dùng bao giờ. Simple Controller i. 50 (you may need even more)タイマーは、JMeterが次のリクエストを送信するのを遅らせるために使用されます。. Simply set the wait_time = constant_throughput (0. 1). Also, JMeter tries to set the throughput per minute, so tests should be longer then 1 or 2 minutes with that timer. 1). Add Constant Timer as a child of the first request and configure it to introduce "sleep" for 30 minutes: in this case the delay will be introduced before first request, see A Comprehensive Guide to Using JMeter Timers article for more information. If the machine stamps sixty widgets in one minute, it’s throughput is one widget per second. When you need to add a delay based on an edge condition which is not covered by other timers i. Constant Throughput Timer acts precise enough on minute level so expect your number of requests applied from 2nd minute and onwards. Constant Throughput Timer introduces variable pauses, calculated to keep the total throughput (in terms of samples per. Another factor is application response time as JMeter waits for the previous response before sending the. 3. So it's your job to provide sufficient number of threads in the Thread Group. Throughput timer is in root of test plan, Where as other timers are only applicable within scope of controllers. If you want to slow. Precise Throughput Timer. Despite word "Constant" in its name it doesn't have to be constant, you can put a JMeter Property in the "Throughput" input field and change it on the fly. For instance 200k requests per hour is more or less 55 requests per second, if your application response time is 1 second - you will need 55. If you're not able to reach the target throughput the reasons could be in: There are not enough threads in the Thread Group to conduct the desired throughput. 1 Answer. Precise Throughput Timer. 7 requests per second. Thread group elements are the beginning points of any test plan. All you need to do is to slow it down a little bit, one of the options is adding a Constant Throughput Timer. “Calculate throughput “ option can be varied based on the current thread, all threads in your test plan. The main factor is your application response time, if it will be 1 second - go for 400 threads for 1 request, if it is 2 seconds - you will need 800 threads for 1 request, etc. Adding a constant timer on a transaction. In addition, these timers are used for simulating the real user think time. Follow asked Nov 1, 2022 at 13:41. log can be very useful for troubleshooting JMeter-specific issues. The test-plan includes a Constant Throughput Timer which is defined in terms of a property, e. JMeter - Timer - "Constant Throughput Timer" C onstant Throughput Timer is used as a goal-oriented element which helps to achieve the desired throughput (Total Number of Requests). Its called JMeter Throughput Constant Timer. JMeter Timer Overview The purpose of all “Timer” test elements is pausing a JMeter Thread representing a virtual user for a certain amount of time. Before understanding the semantics of throughput, let’s look at the concept. How to add "HTTP Cache Manager" element? You can follow the below steps: 1. Solution 1: You can use Stepping Thread Group (allows to set thread number increase stages over set periods of time) with Constant Throughput Timer in it. 1 Answer. Also be. Constant Timer at Thread Group level. added a constant throughput timer to the ultimate thread group and gave the value as 480 requests per minute. 2. If above information is not enough try to elaborate your query and include i. When the throughput is saved to a CSV file, it is expressed in requests/second, i. I just want to fix requests fired per second. Download. 1 Thread Group. Start RPS End RPS Duration 1 10 3600 2 4 3600 2 8 3600 Total Number of Users- 300 ; Ramp Up 600 Seconds ; Duration of Test 10800 Seconds. I have already referenced the class file called VariableThroughputTimer. JMeter slaves are totally independent beasts hence they don't know anything about each other so both nodes will produce 200 TMP therefore you will get 400 in total. If you want to send 1 request each 20 seconds - the same approach as for point 2 but Target Throughput will. jmeter. To achieve this look at the Constant Throughput Timer. If 20 users process 2400 records per hour and each record assumes 3 web page calls, it means that 7200 requests will be made in one hour which in its turn stands for 120 requests per minute (this is what you should enter into the timer's "throughput" area) or 2 requests per second. according to your application design you can retry this. In the JMeter script, Constant Timer is used to add a constant delay before processing a sampler. If you look at JMeter's Thread Group you will see Specify thread lifetime input:. {"payload":{"allShortcutsEnabled":false,"fileTree":{"src/components/src/main/java/org/apache/jmeter/timers":{"items":[{"name":"gui","path":"src/components/src/main. Constant Throughput Timer; Throughput Shaping Timer; Precise Throughput Timer; Random number of messages in the request body payload: in both tools you will have to write some code for this, in LoadRunner you basically have to write the code for everything, in JMeter you can add JSR223 PreProcessor and use Groovy. Select it and you will see 3 fields as below. You can add this element to your test plan by following “ Thread Group -> (right click) -> Add -> Timer -> Constant Throughput Timer ” path. 0. If you're using > 1 virtual user and uncertain regarding ramp-up settings consider using Throughput Shaping Timer which is more precise out of the box. JMeter also provides a timer component, ‘Constant Throughput Timer’, which you can use to set the value of Transactions per. If it is added under a sampler then the parent sampler will wait for the defined time. In Gaussian and Poisson random timer, the random number generation is based on the pre-defined function, but in the. or Users - 2000. Constant Timer: To delay every user request for the same amount of time use Constant Timer. Precise Throughput Timer: siêu phức tạp, mình sẽ tìm hiểu rồi viết sau (hên xui) IV. Timers provided in JMeter Constant Timer. So you need to supply the sufficient amount. Components presented here provide the functionality to introduce User Think Time in various forms among samplers. JSR223 Timer. A user logs in, goes to the main page, searches for a product, sees the results and goes to the detail page of one option. 1. Now, add the Constant Throughput Timer. 2. Precise Throughput Timer allows you to reach and maintain the desired throughput (number of requests per given amount of time) Gaussian Random Timer - allows you to simulate "think time". Though the name implies it is constant, various factors affect the behavior, such as server capacity, other timers or time-consuming elements in the test. Constant throughput timer (Timer) jmeter; Share. So the options are in: Increase the number of threads in the Thread Group to i. Pre Processors: allow you to perform operations/actions before. JMeter now supports. 0. Second, it works precise enough on "minute" level. 3. Ramp up 1 second for all. A Constant Throughput Timer will look like the picture above. Long time JMeter users had to try their tests on and on, finding exact number of threads and timer delays that produce desired number of requests per second (RPS) to server. 6 requests per minute or 2. Why even making use of the Constant Throughput Timer I sometimes get a number of requests higher than the value specify in the Target Throughput (21 in the above image) If a indicate a value of 21 in. The different types of timers available in JMeter are – Constant Timer, Gaussian Random Timer, Uniform Random Timer, Constant Throughput Timer, Synchronizing Timer, Beanshell timer, BSF Timer, etc. 4. Oct 10, 2022 at 7:06. e. Do not include multiple CTT in your test script as it will lead to a hoax. 下面举例来看看如何做到以固定吞吐量发送请求，创建一个JMeter脚本，加入了若干thread only表示对单个线程生效。. If you want to run parallel requests - just increase the number of threads in the Thread Group to reach the desired concurrency. Constant Throughput Timer will let you control the flow of requests to be. 0. With regards to point 1 be aware that Constant Throughput Timer can only pause threads in order to limit JMeter's throughput to the desired number of requests per minute. You can add this element to your test plan by following “Thread Group -> (right click) -> Add -> Timer -> Constant Throughput Timer” path. So you creating the excessive number of threads and then the timer will. JMeter Constant Timer, Constant Throughput Timer. Constant Throughput Timer can only pause the threads to reach specified "Target Throughput" value so make sure you provide enough virtual users (threads) to. If your workload patterns are more complex consider using Throughput Shaping Timer在 JMeter中定时器 用来设置延时和同步，以调节请求的发送速率，那么如何产生固定 吞吐量 的压力哪？. 1. Constant Throughput Timer will let you control the flow of. No other timer or plugin is added in the test plan. Sample Time of Sample 2 is 172 ms. JMeter's Constant Throughput Timer can only pause the threads in order to limit requests execution rate to the desired value, it won't kick off extra threads if current amount is not sufficient. 0 (inclusive) and 1. July 1, 2023 by PerfMatrix. If it is added at the Test Plan level then it acts as a global timer and the delay is added for all the samplers before the process. Testing without a JMeter timer can create irregular test results because the simulated requests will come in a different pattern than. Follow. Timers can only pause JMeter samplers execution rate in order to limit JMeter's throughput to the desired value so you need to supply sufficient number of threads in the Thread Group. We know that JMeter is an open-source, free tool used to conduct load and performance testing on static and dynamic web applications. . Poisson. JMeter sends specific types of requests to the server; with the help of samplers, the thread group decides which request is required to. Constant Throughput Timer allows us to keep total throughput constant. 0. if the transaction controller has 3 child samplers and you want the whole transaction to be executed 100 times/minute - you need to set the target throughput to 300 requests/minute. Constant Throughput Timer. JSR223 Timer. I think it will be more accurate than looking at locust's current_rps tracker, especially at low load. 20 requests per second. Timers provided in JMeter Constant Timer. You can try setting the number of threads to i. Do not include multiple CTT in your test script as it will lead to a hoax. In JMeter you can control the connect/response timeouts at the "Advanced" tab of the HTTP Request sampler (or even better HTTP Request Defaults) where you can increase the default timeouts to the desired values:. Select "Test Plan" node. JMeter timers mainly include Constant Timer, Uniform Random Timer, Precise Throughput Timer, Constant Throughput Timer, Gaussian Random Timer, JSR223 Timer, Poisson Random Timer, Synchronizing Timer, BeanShell Timer. Example configuration: Add Constant Throughput Timer as a child of the Login sampler. Also, it works only on a minute level so you need to properly calculate the ramp-up period and let your test run long enough. The Apache JMeter site actually puts the workings of the ramp-up period best:. Por ejemplo, cuando necesitamos mantener el servidor bajo cierta presión durante mucho tiempo, podemos controlar el rendimiento a través de este temporizador. In case of throughput; the higher the better. Throughput, essentially, is the. Also Constant Throughput Timer works on minute level and your desired throughput should be. Constant Throughput Timer – introduces variable pauses, calculated to keep the total throughput as close as possible to a given figure. 12. If it is added under a sampler then the parent sampler will wait for the defined time. If you want to limit your test. In case you have only 1 request as in your scenario then it will generate Throughput of 20 request/sec (sometimes 20. Add Constant Throughput Timer to your Test plan and configure it to send 30000 requests per minute (500 requests per second) Make sure that all the Samplers are in the Constant Throughput Timer's scope and you have. The. So your approach with different Thread Groups is valid. If 0 is given then JMeter will release the same number of users which is defined in the thread group. You could make the target throughput a variable too. This is the function of Constant Throughput Timer. If current number of threads is not enough in order to. Jmeter: Constant throughput Timer with Ultimate Thread Group. Try running your test with 1 virtual user. I ended up using constant_throughput to control the number of requests per second. Precise Throughput Timer → this timer will vary its delay interval to keep requests at or below a certain threshold. This would allow you to adjust it via Command Line in real time, as the test script is being executed. 5. And then execute the test we see that the execution of each sampler is delayed by 2000 milliseconds. S3E3 Learn JMeter Series - Constant Throughput Timer. Constant Timer at Thread Group level. Nested classes/interfaces inherited from interface org. 7 requests per second. Also, it works only on a minute level so you need to properly calculate the ramp-up period and let your test run long enough. Share. This video features Precise Throughput Timer in #JMeter. This timer generates Poisson arrivals with constant throughput. The constant timer is the basic timer among all the given ones. 2. Right click on "Test Plan" node. Constant Throughput Timer. This includes any intervals between samples, as it is supposed to represent the load on the server. My website's expected performance is 200 concurrent users at 8 RPS. 0. e 300s. Constant Throughput Timer: Constant Throughput Timer presents random delays between requests in a manner that a load/stress of necessary throughput is sent to the application. Constant Throughput Timer. Test Case 1: - 3 requests per minute - 1 request each 20 seconds. 6. 6. So you must supply enough threads in the Thread Group to create more requests per second than you're trying to achieve and then limit the number of requests per second to the desired rate using. Constant Throughput Timer. Of course the throughput will be lower if the server is not capable of handling it, or if other timers or time-consuming test elements prevent it. This ultimate thread group will give you more control over Threads. The easiest way of controlling the number of requests per second (throughput) in JMeter test is using Constant Throughput Timer. Constant Timer. Second, it works precise. So the real throughput depends on 2. Add Constant throughput timer to the thread group as shown below. Gaussian Random Timer. BSF Timer. If you server is able to respond in constant response time then throughput will remain the same for a given number of clients (threads). e. Actually I use a constant throughput timer to keep the frequency constant. 0 elements: Constant Timer. Now if you want to control the rate of transactions per second or the number of samples to execute you can use Constant Throughput Timer. Jmeter: Constant throughput Timer with Ultimate Thread Group. Throughput Shaping Timer. Constant Throughput Timer is only capable of pausing JMeter threads in order to slow them down to reach the target throughput. Keep the think time to create a more realistic behaviour ( optional )It might be the case Constant Throughput Timer is not "precise" enough, given you need to limit JMeter's throughput to 15 requests/minute assuming 20 threads it's better to consider Throughput Shaping Timer which has lower granularity therefore it's being applied immediately and gives exact throughput figures comparing to the. Despite its name Constant Throughput Timer doesn't have to be "constant", you can define throughput default value using __P(). 1. By the way, there is an extended version of the CTT. Throughput Controller - You can set the Max number of executions, OR the Percentage of executions of the sample (i. Constant Throughput Timer pauses active threads to reach throughput level you define.