Constant Throughput Timer is only capable of pausing JMeter threads in order to slow them down to reach the target throughput. I am adding throughput timer but then I need to set up. We will also briefly look into the usage of JMeter’s Throughput Constant Timer. Concurrency Thread Group doesn’t provide the ability to define initial delay, step transition and ramp-down - which the Stepping Thread Group does. 1. 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. e. TestElement. One widget at a time is passed through a machine that stamps it with a label. Example configuration: Add Constant Throughput Timer as a child of the Login sampler. The simplest way is to add a single 'Constant Timer' to your thread group at the same level as your HTTP requests. 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. If your goal is to mimic real users behavior as close as possible -. The Constant Throughput Timer is again a more powerful Timer, not in the same way the previous. I think that you're misusing Constant Throughput Timer. The first request wil receive the correct amount of throuhput the first time, and so will the 2nd request. Hot Network QuestionsThe formula is: Throughput = (number of requests) / (total time). Throughput Shaping Timer is a plugin and you need to install the plugin. JMeter provides lots of ways to record the value of throughput. The main goal of. This is the function of Constant Throughput Timer. 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. This is known as Think Time and Jmeter provides different types of timers to help add the right amount of between samples: Constant Timer – will pause for the same amount of time. 0. Listeners, may be placed directly under the test plan, in which case they will apply to all the thread groups. Step 3. Precise Throughput Timer. In case of throughput; the higher the better. Let's see a brief thought on this: To achieve the target throughput, you need to have. Use Cases. Constant Throughput Timer. 4. However, in one case I need an additional constant timer because I need to wait a certain time between two requests. Test Case 1: - 3 requests per minute - 1 request each 20 seconds. is correct, but if you leave it as is JMeter will execute requests as fast as it can. In case of scenario 2 you'll need Constant Throughput Timer. JSR223 Timer. If you change the Constant Timer is zero, you will see the result is changed. 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. And one of them has an obvious title – “Constant Throughput”. Test Plan 2. Constant Throughput Timer. If you get response times comparable to what you see in Fiddler. Download. Remember - if the application itself is not supporting the desired throughput, jmeter can not help here. The following BeanShell commands could be used to change the test:If you need provide constant load at 300 requests per second rate - you'll need Constant Throughput Timer. g. Throughput shaping timer or CTT to control the expected throughput. Constant Throughput Timer can only pause the requests to limit JMeter samplers execution rate to desired value, it won't kick off any extra threads if the current throughput is lower than expected. It may decrease if other timers deny the constant. A constant throughput timer in JMeter is used to achieve the actual output by computing the total number of requests. 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. The Uniform Random Timer. Click Add –> Timer –> Constant Timer. The constant timer pauses the test execution for a constant period. 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 full jmeter. Throughput Controller - You can set the Max number of executions, OR the Percentage of executions of the sample (i. Sorted by: 2. 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？. 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。. 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. To see the full JMeter Timer List, click on the Thread Group -> Add -> Timer. I would suggest going for Constant Throughput Timer. Constant Timer: To delay every user request for the same amount of time use Constant Timer. Throughput Shaping Timer Properties. Constant Throughput Timer - You can set the amount of Throughput (samples per minute) by adding a timer after the request to slowdown the script, so it fits the throughput value. 0. HTTP Sampler ii. Improve this answer. Constant Timer: This is one of the most popularly used timer in JMeter. Constant Throughput is a. 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. Essentially, it sticks with a target throughput very closely, and doesn’t allow for the flexible. However it is precise enough only on "minute" level so you might need to play with ramp-up period. Constant Throughput Timer can only pause threads in order to limit JMeter's throughput to the defined value. My load would be held for 3 minutes. In planning our load tests, our goal is often to measure whether or not our application (not just the. All controllers and samplers must be under a thread group. If your goal is to mimic real users behavior as close as possible -. Throughput value in the Constant Throughput Timer can be changed to different values by using a variable. But if I place my requests in separate Thread Groups - Throughput Controller doesn't work. 30. Share. Constant Throughput Timer introduces variable pauses, calculated to keep the total throughput (in terms of samples per. My website's expected performance is 200 concurrent users at 8 RPS. If you need to use the same common steps in several Thread Groups. Constant Throughput Timer: Target - 60,000/min (60 secs) - all active threads, Threads (Users) - 200 with Ramp up - 1 sec, Duration: 1 hour. Mouse hovers "Add". Add Synchronizing Timer to the request and set Number of Simultaneous Users to Group by to X. Name Email Website. jmeter. A Constant Throughput Timer paces the samplers under its influence so that the total number of samples per unit of. 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. The Constant Throughput Timer has a setting that lets you share its timer across 'All Active Threads' so that you create a constant load on a server. Constant Throughput Timer. Apache JMeter is an open source Java based tool that enables you to perform functional, load, performance and regression tests on an application. 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. Constant Throughput Timer is precise enough on minute level so you might need to adjust your ramp-up period or consider using Precise Throughput Timer instead Constant Throughput Timer can only pause the threads to limit JMeter's requests execution rate to the given value so make sure to supply sufficient amount in the Thread. JMeter acts as follows: It starts all threads within specified ramp-up period. Thread group elements are the beginning points of any test plan. JRS223 Timer. One widget at a time is passed through a machine that stamps it with a label. Results: The JMeter Timers available are as follows: BeanShell Timer. Ori Marko Ori Marko. For example: 1000 target threads with 1000 seconds ramp-up: JMeter will add one user each second18. While running test simulations, it is sometimes necessary to be able to specify the throughput in terms of the number of requests per minute. 0 Calculate Throughput based on: all active threads in current thread group So now, in 1 minute, JMeter will try to send 3000 requests and in 5 minutes, request count will be more or less around 15000. 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. It means that you have to implement the thread delay logic by yourself using one of the supported scripting languages. はじめに. JMeter Perfmon. i can see response times over 40 seconds. Constant Throughput Timer pauses active threads to reach throughput level you define. We know that JMeter is an open-source, free tool used to conduct load and performance testing on static and dynamic web applications. Constant Throughput Timer. This will add Constant Timer at Thread Group level. This timer adds a delay between each request. Looking into the Average Response Time which can be as high as > 1. Let’s think about an end-to-end scenario for an e-commerce website. Ramp-up is the time for JMeter to kick off the virtual users from point 1. In particular the most commonly used elemends are: Synchronizing Timer – to pause threads unless certain number will be reached and fire them all at the same time. Ori Marko. 6. In both the cases structure of the test will be like the following:Be aware that Constant Throughput Timer is accurate enough on minute level so it can start pausing the threads only after 1 minute. S3E3 Learn JMeter Series - Constant Throughput Timer. 作用：让jmeter以指定数字的吞吐量进行压测. I have used the constant throughput timer before, also as child of certain requests. Mình tin là bạn cũng muốn có case này trong kiểm thử của mình. Set the timer value to however many milliseconds you need (in your case 120000), and it inserts a delay between all requests in that thread group. Constant Throughput Timer; JSR223 Timer #20. either execute this 100 times OR. It is often the first step to develop test plans for applications. I have constant throughput timer which will hit 1 request in 3 minutes in my test plan due to this my requests are getting timeout as it is delaying requests to 1 hour. you will be able to send 50 requests per second, etc. How to calculate. host, port – jmeter’s host and port for the machine, where it is running. JRS223 Timer. If your script keeps hitting timeouts and includes these elements, remove or disable them unless they are important for your functional test scenario. This component introduces pauses to the test plan in such a way as to keep the throughput as close as possible to the target value specified. Click Add –> Timer –> Constant Timer. In JMeter, the ramp-up period defines the time period within which all the specified users get in running state. Summary Report I have tried 2 ways: Instead of simple controller, i have used throughput controller and used percent Executions. HTTP is a stateful protocol, it means that JMeter's HTTP Request samplers wait for response prior to sending a new request so. ${__P(throughput)}. And then execute the test we see that the execution of each sampler is delayed by 2000 milliseconds. 6. apache. java:131. What do you mean by "total transactions"? If you want to send 30 requests in 15 minutes more or less evenly distributed you need to use Constant Throughput Timer instead of the Synchronizing Timer and configure it to send 2 requests per minute. Throughput - the Throughput is measured in requests per second/minute/hour. This video features #Constant #Throughput Timer in. When I specify 50 threads on the Thread Group and a throughput of 1 sample per minute, I see 50 samples go through immediately and then 1 sample per minute after that. Below screenshot is list of all Timers provided by JMeter to control the load. Constant Timer. Now, add the Constant Throughput Timer. It pauses the execution of test for a specified constant amount of time. Constant Throughput Timer acts precise enough on minute level so expect your number of requests applied from 2nd minute and onwards. Constant Throughput is a calculator that checks the number of requests per time unit. If you want to send 1 request each 20 seconds - the same approach as for point 2 but Target Throughput will. As per documentation: Set Target Throughput = 40. Given here are some JMeter listeners that you can use for this purpose: Summary Report Aggregate Report Aggregate Graph Graph Results. 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. Of course, if the server is not able to handle such a load, the throughput will. และเราสามารถใช้ Constant Throughput Timer ในการกำหนดจำนวน request ต่อนาทีที่เรา. The test plan currently uses two thread groups and runs those in loops. 1. 作用：用来设置集合点，其作用是：阻塞线程，直到指定的线程数量到达后，再一起释放，可以瞬间产生很大的压力. 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. N. 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. In Gaussian and Poisson random timer, the random number generation is based on the pre-defined function, but in the. JMeter. As a practical example, assume you have a long-running JMeter test running in CLI mode, and you want to vary the throughput at various times during the test. Constant Throughput Timer is only capable of pausing JMeter threads in order to slow them down to reach the target throughput. 1. Constant Throughput Timer cannot force threads to execute faster, it can only pause threads to limit JMeter's throughput to the defined value. The Throughput Shaping Timer plugin also adds a number of properties to the standard JMeter functionality: elementName_totalDuration is a sum of all durations from the Request Per Second Schedule. However, in one case I need an additional constant timer because I need to wait a certain time between two requests. Bạn sẽ nhập 1 giá trị ngẫu nhiên vào Constant Timer thay vì giá trị cụ thể. 0. 3. Each timer has a different application, which we have outlined here: Constant Timer: The most basic timer, this will simply add a delay to the threads before they are initiated. 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. Jmeter: Constant throughput Timer with Ultimate Thread Group. 866 + 172 + 5000 = 22:05:07. Precise Throughput Timer is more "precise" but a little bit harder to use as you need to provide controlled throughput. Also, JMeter tries to set the throughput per minute, so tests should be longer then 1 or 2 minutes with that timer. org. JMeter also provides a timer component, ‘Constant Throughput Timer’, which you can use to set the value of Transactions per. I have already referenced the class file called VariableThroughputTimer. log. This will ensure that request is made minimum 100 per minute. Do not select "This thread only" value for Timer added at root, as it will change the result. Precise Throughput Timer. Follow. These timers will pause the threads and try to achieve the specified throughput value. I am developing a JMeter Script according to the below requirement. 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 execute 300 000 queries in 24 hours you need to introduce a rate limiting on JMeter side to execute 208. Throughout the Hold Load time(180sec) the requests will be looped. 0” your throughput during the test will be 1 request per minute. Constant Timer. How do you expect the timer to "work" given you have only one thread and one iteration in the Thread Group especially given your test finishes in 500 milliseconds and you configured the test duration as 500 seconds. JMeter sends specific types of requests to the server; with the help of samplers, the thread group decides which request is required to. apache. The timer tries to produce a constant throughput till the end of the test to achieve the target. 3. Constant Throughput Timer. 20 requests per second. 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. 3. 6. "Throughput depends on response time. Precise Throughput Timer (PTT) Como mencionamos previamente, el Precise Throughput Timer (PTT) y Constant Throughput Timer (CTT) tienen como propósito regular el arribo de hilos (Vusers). Constant Throughput Timer: acts precise enough on "minute" scale, if your test lasts less than minute it might not apply the throughput. Actually I use a constant throughput timer to keep the frequency constant. 12. 1. Share. Closed asfimport opened this issue Apr 25, 2014 · 5 comments Closed Constant Throughput Timer: Java 8 incompatibility #3368. The application. You can see that Start time difference between 1st request and 41st request is 1 minute. 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. Target Throughput behavior of Constant Throughput Timer in JMeter. The constant timer is one of the most widely used timers in JMeter. 0” your. Config Elements, b) a Thread Group (probably Ultimate), c) a Constant Throughput Timer (to limit the overall transaction rate), then d) 8 ThroughPut Controllers, and then INCLUDE the scripts in respective controllers, e) Listeners. The first thread group randomly picks one of several. Test execution result will looks like below for constant throughput timer jmeter example. 1. So first of all try increasing the number of threads; Make sure to follow JMeter Best. Also Constant Throughput Timer works on minute level and your desired throughput should be. 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. Relation between Constant throughput timer, transactions per sec and throughput in summary report 0 How to get number of throughputs per second as 500 in jmeter54. For example, a Bean shell timer is usually used to give delay time or think timer in between sampler requests. In-depth Analysis: Throughput Controller in JMeter and Splitting Threads to Requests. Follow edited Mar 4, 2021 at 7:35. This plugin also works similarly to Constant Throughput Timer, which pauses the threads based on the target Throughput. How to generate number of requests per second for one user. Component Properties - Properties that contain information about the duration and. JMeter provides lots of ways to record the value of throughput. So the formula is: |0. 1. Improve this question. I have to test if it can scale upto 25000 requests per second without failing. 0 and Calculate Throughput based on is all active threads. To achieve this look at the Constant Throughput Timer. This timer generates Poisson arrivals with constant throughput. 0 (inclusive) and 1. This is what we need to control request frequency. Doing the math, it should send a request every 5 milliseconds, and being 200 Threads, it should send 200 requests/second (200*5 = 1000ms). 2. JMeter cannot send requests faster than your application is capable of responding. If it is. Constant Timer or Gaussian Random Timer or Uniform Random Timer or whatever. QAInsights. Constant Timer. either execute this 100 times OR. Click Add –> Timer –> Constant Timer. So you creating the excessive number of threads and then the timer will. Constant Throughput Timer: This timer define the number of sampled need to be executed per. View Results Tree 5. I am trying to configure a test for signup-login with invalid credentials imitating bruttforce attack. Actually you can just provide enough users and focus on controlling how often they will be sending requests via Constant Throughput Timer or Throughput Shaping Timer. 0. The various timers provided by JMeter include the constant timer, uniform random timer, constant throughput timer, Poisson random timer and Gaussian random timer. 2. The Apache JMeter site actually puts the workings of the ramp-up period best:. This will add Constant Timer at Thread Group level. 让线程暂停一个随机时间。由两部分组成： Random Delay Maximum 随机延迟部分; Constant Delay Offset 固定延迟部分; 实例： 1、添加线程组，添加 Uniform Random Timer ，添加HTTP请求，设置固定延迟部分未2000毫秒，随机延迟部分在2000ms。也就是线程延迟在2-4s之间Built-in Constant Throughput Timer; Throughput Shaping Timer from jmeter-plugins. JMeter Timers obey JMeter Scoping Rules so if you put the Constant Throughput Timer under a Thread Group - it will be applied only to this thread group. 7. The number of requests per second has to be controlled by using constant throughput timer (or the one from jmeter-plugins). Oct 10, 2022 at. Poisson. Each JMeter thread executes samplers as fast as it can, however next iteration won't start until previous is finished so given you use 1 thread - the throughput won't be higher than application. Share. JMeter cannot send requests faster than your application is capable of responding. This time you will be able to correlate increasing load with other metrics like response time, throughput, number of errors, etc. If there are 10 threads and a ramp-up time of 100 seconds, then each thread will begin 10 seconds after the previous thread started, for a total time of 100 seconds to get the test fully up to speed. Results Action Set Handler 4. basically, drop the synchronising timer, use a constant throughput timer instead, configure wait times and then calculate the. Please suggest what should be the workaround of it? You can go for Constant Throughput Timer, despite the word "constant" in its name it doesn't have to be constant, you can use __P() function for specifying the desired throughput and amend it from Beanshell Server, another Thread Group, using JSR223 Test Elements, etc. Both the scenarios you have mentioned may require thinking for a moment that there's something fishy if they both use a different unit of time. Below you will find a categorized list of the most common timer elements included with JMeter. 1. Có rất nhiều timers được cung cấp trong JMeter: Constant Timer, Gaussian Random Timer, Uniform Random Timer, Synchronizing Timer, etc. 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. Khi đó bạn sẽ cần sự trợ giúp từ hàm _Ramdom của JMeter. July 1, 2023 by PerfMatrix. jmeter. Timer in JMeter is easy but crucial part of JMeter where we have to manage the thread user count and time to apply the load to the application. Since: 4. jmeter; performance-testing; Share. So you will get 10 threads up and running only by 19th second. Simply set the wait_time = constant_throughput (0. Recording scripts is where you will spend most of your time. 1). 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. 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. jmeter. 1 Thread Group. 1 Answer. 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. Moreover, it's more or less precise only on "minute" level, if your test lasts less - you may not see the impact. Uniform Random Timer, Constant Throughput Timer, Synchronizing Timer, Beanshell timer,. You can see that Start time difference between 1st request and 41st request is 1 minute. 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. 3. Then extract the file and run JMeter: $ tar -xf apache-jmeter-5. If it is added under a sampler then the parent sampler will wait for the defined time. Each having its own constant throughput timer . 4. It is important to get this peak throughput level correct because otherwise you either end up with a load that is too high (you waste time solving problems that are not problems) or too low (you don't find problems that are real problems) but if you already have. This is "closed workload" approach, and it has major drawbacks (see here why). so in your plan, you add. Constant timer means the interval between each request is a fixed value. The threads in my thread group. I ended up using constant_throughput to control the number of requests per second. although the Timer is called the Constant Throughput timer, the throughput value does not need to be constant. The Uniform Random Timer pauses the thread by a factor of: The next pseudorandom uniformly-distributed value in range between 0. Right click on "Test Plan" node. If you set its value as “1. Instead of focusing on trying to hit the same request at the same time, which is fiddly in JMeter, you should setup your test to be a realistic representation of the sort of load you want your application to support. new_throughput – new intensity value, op/min. This is "closed workload" approach, and it has major drawbacks (see here why). Its called JMeter Throughput Constant Timer. Hot Network QuestionsYou can slow down JMeter's number of requests per minute by using Constant Throughput Timer. The timer tries to produce a constant. The constant timer is the basic timer among all the given ones. A Constant Throughput Timer paces the samplers under its influence so that the total number of samples per unit of time approaches a given constant as much as possible. In planning our load tests, our goal is often to measure whether or not our application (not just the. Running Jmeter script by targeting 1000 requests per second (Business SLA) hence used 'Constant Throughput Timer' or 'Throughput shaping timer' as suggested in below queries. See How to use JMeter's Constant Throughput Timer. 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. 1 Answer. How many threads you use depends. 0 (exclusive) Multiplied by “Random Delay Maximum”. 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. 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. Because JMeter sometimes displays throughput in per minute and sometimes in per second, whereas the hits per second is always per second. Example 1: you have submitted a request and it returns "pending" status. e. iii. You can also use a JMeter Function or Variable in the “Thread Delay” input. __setProperty() function or even outside JMeter via i. org; The function of timers is to delay the requests. And run the following to. JMeter timers mainly include Constant Timer, Uniform Random Timer, Precise Throughput Timer, Constant Throughput Timer, Gaussian Random Timer, JSR223 Timer, Poisson Random Timer, Synchronizing. This would allow you to adjust it via Command Line in real time, as the test script is being executed. Remember 2 things: Throughput Timer isn't able to create threads, it can only slow them down so make sure that you provide enough threads to reach desired target throughput July 1, 2023 by PerfMatrix. So overall 20 users - ramped up in 1 seconds. The JMeter Ramp-up Period is the amount of time in seconds it will take Apache JMeter™ to add all test users (threads) to a test execution. Before understanding the semantics of throughput, let’s look at the concept. If the request took 1000 mSec, it will apply 4500-1000 = 3500 mSec as the pacing. Despite its name Constant Throughput Timer doesn't need to be "constant", you can define the desired throughput via JMeter Property using __P() function like ${__P(throughput,)} and amend the property value using i. Component Properties - Properties that contain information about the duration and current state of the test. Based on RPS you want you can either set the value low for less number of requests and more for more RPS. With 100 threads you will get 50 requests per second. It's easier to configure as it provides a graph demonstrating. Thanks @Dmitri. If the machine stamps sixty widgets in one minute, it’s throughput is one widget per second. 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. 2. Follow asked Oct 26, 2019 at 10:10. You can add this element to your test plan by following “Thread Group -> (right click) -> Add -> Timer -> Constant Throughput Timer” path. Download. 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. 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. 1 Answer. 1000 and slowing the requests down using Constant Throughput TimerI've set up a jmeter distributed testing setup with one master and multiple slaves. If current number of threads is not enough in order to. For example, if the number of threads is set to 10 and the ramp-up time is set to 100 seconds, JMeter will use 100 seconds to start and run 10 threads, and each thread will start 10 seconds after the previous thread was started.