So creating a 30-seconds delay would be something like: return 30000. chalz. e. For example, if the test case describes the deletion of a user from the user database, adding the user is aThere are two parts to a Delay For action: the value (how many) and the unit (the type of time). Logic Controllers help you to control the flow the order of processing of samplers in a thread. 1" 2020-04-14 Note: There might be more issues for flow control action when Break current loop is used, so if you have time please investigate. You'll start by mastering assertion types and scripts. Flow Control Action (was: Test Action ) SMTP Sampler; OS Process Sampler; MongoDB Script (DEPRECATED) Bolt Request; 18. I used startup delay under Threadlifetime setting of the Thread Group and it seems to work. 4. If you want a standard pause (think time) between pages, you can use the "add think times to children". Instead, you use an element of the Constant Throughput Timer, Constant Timer, or Flow Control Action type. I have recorded JMeter script for a website. In the thread group the duration is set to 300 sec. So either put Timer as a child of first sampler in Login Controller, (it'll add delay also in first login) Or add a Flow Control Action at the end of the Logout controller with Timer as its child. The purpose of the ‘Timer’ element is to pause a JMeter Thread for a certain amount of time. Previous. You can configure JMeter to "gather" all threads and tell them to wait for the specified amount of time together by adding a Flow Control Action sampler and a Synchronizing Timer with number of users to group by equal to the number of threads in your thread group About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features NFL Sunday Ticket Press Copyright. Constant Timer. Answer: Controllers are used in JMeter to control the flow of execution of requests. I'm scraping the token with JSON extractor, and parcing it using the BeanShell post-processor, by the following command:0. Read from CSV delimited file. The structure of JMeter functions is: $ {__functionName (var1, var2, varN)} Functions can be used for. - depending on. It scales web development by helping you measure and analyze application performance. JMeter Interview Questions and Answers for 2023. The way JMeter works is 1 masterTo get JMeter support on Jenkins, you need to use the Performance Plugin. Great, we're just one step behind having a virtual user created from a Charles recording. 1 Answer. 1. The first method (adding a Flow Control Action) didn't work. In one thread group. Follow answered Dec 21, 2020 at 7:36. Click the Add button twice and enter the username and password details. ] Set the path to the target of the submit button. 168. This can be. For tests distributed over several load generators, make sure to configure your Setup Thread to be Global so it is executed only once per test (instead of once per load. Add a Test Action Sampler In the "Duration (milliseconds)" field, set the value as simply $ {mydelay} Right Click Test Action Sampler > Add > Timer > Beanshell timer. 5 minutes after the POST request. JMeter automatically treats HTTP Request samplers with status codes above 400 as failed so you don't have to go for scripting, you can stop the test using If Controller using the following condition: ${__jexl3("${JMeterThread. I added flow control action (for delay) before my login. 定数スループットタイマーで負荷量を調整する. 2. Rather than generate a sample, the test element either pauses or stops the selected target. 5 for the value and then choose hours for the unit. 13+8-Ubuntu-0ubuntu1. Run Thread Groups in parallel. correcting plugin action components' resource key usages by @woonsan in #631;Here I am defining the variable host with a default value of "localhost". bat. Add Flow Control Action at the end of the test for pausing exact time before next loop. Contents. c) Now Add the. 2 Logic Controllers. Simply drop the file in the HAR area or use the Choose File. 1 What are Logical Controllers 2 Once Only Controller 3 Transaction controller 4 Loop controller 5. Percent executions per VU: causes the container to execute a certain. 1. A thread group is a set of threads executing the same scenario. The Thread Group is an element of JMeter that controls the number of threads to execute your test. For this flow, the value must be code. Use an XPath expression to read from a file. Add 10 user every second for the ramp-up - you need to set ramp-up period of 3 seconds in the Thread Group. Insert Flow Control Action sampler between requests and configure it to "Pause" for 3000 milliseconds. currentTimeMillis ()) Use the following __groovy () function as the While Controller's condition:Thanks for contributing an answer to Stack Overflow! Please be sure to answer the question. batをダブルクリックして実行し、画面が日本語になっていることを確認します。 以上で、JMeterを使用できる準備が整いました。 次からは、負荷をかける為のシナリオ設定作業に入ります。 設定作業（基本）JMeter automatically treats HTTP Request samplers with status codes above 400 as failed so you don't have to go for scripting, you can stop the test using If Controller using the following condition: ${__jexl3("${JMeterThread. 0开始，Test Action已重命名为Flow Control Action. bat. bat on Windows and jmeter. Add Flow Control Action sampler as a child of the If Controller and configure it to "Go to next iteration of Current Loop" However this way you cannot avoid incrementing the count of the Loop Controller and if/when you run out of iterations JMeter will exit the loop (unless it's something you're looking for), this way you can only skip. If you want to add a delay between each iteration of each thread add a Flow Control Action Sampler as the first sampler and set the delay in the controller. This will add the recording capability to JMeter. Step 2: Pass that Token to the Subsequent API's. O’Reilly members experience books. For those new to JMeter, one easy way to create a test plan is to use the Recorder. Add a Thread Group to Test Plan. OR. Copy the file you're going to upload to JMeter's "bin" folder. By: RedLine13. If the request took 1000 mSec, it will apply 4500-1000 = 3500 mSec as the pacing. a) Follow the same Step above to create an HTTP Request and add the second API. Name. so just comment out/remove this quitBrowser function, recompile the plugin and replace the version in the "lib/ext" folder with your own one. Constant Throughput Timer will try to slow down JMeter's throughput to the defined value by sleeping for the period of time before executing the Sampler if needed. If it is added under a sampler then the parent sampler will wait for the defined time and then start execution. in this case the delay will be added after the last HTTP Request sampler 二、Jmeter 测试活动Flow Control Action 实现Think time三、Jmeter固定定时器1. Add Flow Control Action sampler to the end of the "LoginAPI" thread group and configure it to "sleep" for i. jmeter set up. 0. 2 (or to the latest stable version from JMeter Downloads page) as soon as possible 6) Flow Control Action. last_sample_ok},)} it means that If Controller's children will only be executed if the previous Sampler wasn't successful. Timer. You can put Flow Control Action sampler under the If Controller and use the following __groovy () function as the condition: $ {__groovy (vars. 2 there is no WebSocket support out of the box. 65 Question (s) 35 Mins of Read. 0. To pause (sleep) current or all thread for specified amount of time (duration is set in milliseconds). Flow Control Action is a sampler that is intended for use in a conditional controller. Introducing the Synchronizing Timer will act as a "rendezvous" point so JMeter will wait until all the threads are available and then all of them will start "waiting" for 10 minutes at the same time. My thread groups should not start consecutively or concurrently. Phần 4: Mở rộng – Tạo lập Scripts tự động bằng HTTP (S. Recording Controller. Flow Control Action with the delay of 600000 milliseconds and Pause is selected is at the same level as While controller ie it is sibling and not child of While controller. Step1: Create a Test Plan. We recommend creating it as part of a Setup thread so that it is the first thing created during the test. JMeter 5 has added more UI controls for script looping behavior. How to configure the JMeter properties and reporting for this User Profile. Constant Timer) as a child of the 2nd request. encoding”)get “file. 1. 1OS Process, Debug, and Flow Control Action Sampler. . 4. edited Jun 20, 2020 at 9:12. Make sure this is accessible from the load generators. CTRL+SHIFT+G. 使用默认选项【Current Thread】及【Pause. Go to your Azure Load Testing resource, select Tests from the left pane, select + Create, and then select Upload a JMeter script. Share. A complete list of samplers are given here : Flow Control Action. JMeter Overview - JMeter is an extremely popular open-source Java-based performance testing tool for running protocol-based load tests against various web and software services, APIs (SOAP and REST), web applications, and other web services. 20. JMeter has become an industry-standard tool for conducting functional, load, performance, and regression tests on web applications. Dmitri. However, there are a few limitations:· To apply the timer after a sampler, either add the Gaussian Random Timer as a child element of the next sampler or as a child element of Flow Control Action. Get the sampler name (label). you need to amend your test plan configuration to include Synchronizing Timer with Number of Simultaneous Users to Group by set to 500 and replace the Constant Timer with the Flow Control Action sampler. . 0 and 60K+ other titles, with a free 10-day trial of O'Reilly. – JessieB. xml file. If the threads are still running, i need to stop their execution and start the next iteration. Here instead of directly. Copy the 2nd+ certs to notepad or text file, with the BEGIN / END Markers: Application_CA_Public_Cert. Other (and the main factor) is your application response time because JMeter. 在jmeter使用过程中，接口之间相关关联，而有些接口响应时间较长，导致下个接口执行时，可能未能获取到需要的信息。. If it is added under a sampler then the parent sampler will wait for the defined time and then start execution. Add a Flow Control Action sampler which will introduce delay of, say, 29 minutes and add more loops to the Thread Group This way each 29 minutes JMeter will request for the new token and update the property holding the token with the new value. A Test Plan comprises of at least one Thread Group. Token can be passed from one thread group to another using __setProperty and __P (). What's？ Apache JMeterのコマンドラインオプションを確認する方法をメモしておきます。 環境. Read a line from a file. Subscribe to Our Channel : Flow Control Action sampler is used to modify the execution flow of JMeter by performing specific actions. Instead of Constant Throughput Timer you can use Flow Control Action sampler to introduce static delay of 5000 ms. E. 0 authorization code secured APIs using JMeter. Improve this answer. For example, if you wanted to delay your next action for an hour and a half, you would type in 1. The main purpose of the If Controller is to control the JMeter execution script flow. Add a Flow Control Action sampler to the If Controller and set what you want to do. My Requirement is to execute 10 request per second for 5 minutes. To apply a timer after a sampler, either add it to the next sampler, or add it as the child of a Flow Control Action. To pause (sleep) current or all thread for specified amount of time (duration is set in milliseconds). Follow answered Jun 9. Be careful since only children of the flow control action will be impacted. When I turn off Follow Redirects I correctly get the values extracted, but I don't get a cookie that I need for the next request. For login you have used only Username and Password in you request, but there can be other parameters too, which will be required for the successful login. - Option 2 – use the Debug Sampler and View Results Tree. 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. OS Process, Debug and Flow Control Action Sampler - Script; 4. csv file(s). But despite trying several different configs, Flow Control Action never runs. Share. 0开始，当使用默认的HC4实现时，JMeter将在每个线程组迭代时重置HTTP状态（SSL状态+连接）。如果您不想要此行为，请设置= false. This HTTP. The formula is: Throughput = (number of requests) / (total time). 21. Flow Control Action:- Earlier it was known as Test action. A simple JMeter test with sequential requests controlled by a Response Assertion. Sorted by: 10. Notice that JMeter's [scoping rules] execute Timers before Samplers. Also you have options to continue execution, but move to next iteration using. Add Flow Control Action sampler as a child of the If Controller and set it to Break Current Loop. This fixed the same problem for me, except I did not have a LoopController. More information: JMeter WebSocket Samplers - A Practical Guide. Parts of the test plan can also be saved as a different selection. It is a java application so no need to worry about the OS, it will work in the. And finally you can also remove Test Action samplers as they're not required. Constant Timer. JMeter and selenium can be integrated via plugin support of web drivers. Flow Control Action Random Container Action If Action While Action Loop Action ForEach Action Property Action Link Action Post Processors Post Processors Regexp Variable Extractor JSON Variable Extractor. You may use ctx variable from your JSR223 Assertion to get access to JMeter. Since JMeter 3. 2 Basic Instructions. You can pass the token from that Thread Group to "main" thread group via __setProperty () function or using Inter-Thread Communication Plugin. Flow Control Container Action. Add If Controller after the Sampler which you suppose to be failing. You can include timers duration by checking "Include duration of timer and pre-post processors in generated sample" box. Get the local machine name. getProperty (“file. For example, you want some group of requests to execute more times as compared to the others, use the controller to solve this purpose. Techniques used within JMeter to determine issues in the system include the Stepping and Concurrency Thread Groups. I am using jMeter for my testing script. Set following in the IF controller ${JMeterThread. I've created 2 thread groups. Add Debug Sampler to Thread Group. First and foremost thank you for the help. In order to run the test, please place all the attached files in the bin folder of Jmeter. Config Element. Also, you will get some simple and ultimate tips and tricks. 0. you need to amend your test plan configuration to include Synchronizing Timer with Number of Simultaneous Users to Group by set to 500 and replace the Constant Timer with the Flow Control Action sampler. putObject ('whileLoopStart', System. Sampler. Isha presents an highly interactive and instructor led live “Performance Testing Using Apache Jmeter ” Training by our industry expert with hands-on experience. This sampler can also be useful in conjunction with the Transaction Controller, as it allows pauses to be included without needing to generate a sample. . REM JMeterを起動する jmeter. There are 2 possible solutions: You can put some form of "hard wait" using Flow Control Action sampler or suitable JMeter Timer so the next "GET" request will always be executed in i. Share. To take the screenshot ( G raphics) of the selected element. c) Now Add the. asked Feb 9, 2016 at 16:12. Set the number of iterations in the configuration. 这个时候需要对上个接口做延时处理，就用到Test Action。. Right click Thread Group > Add > Timer > Constant Timer. Recording controllers are the just container to store the scripts which you have recorded using. Functions are shortcuts you can use to avoid adding a script block into your virtual user. Flow Control Action Sampler - will create a delay exactly where it's placed in. Improve this answer. Either add a Constant Timer as a child of the "Cancel" request and set "Thread Delay" to 3000. Just add Test Action sampler (since JMeter 5. Most server-based applications usually have more than one scenario, so creating a separate Thread Group mapped with each use case. JMeter has become an industry-standard tool for conducting functional, load, performance, and regression tests on web applications. last_sample_ok}"=="false",)} and add Flow Control Action sampler as a child of the If Controller. 1 during the load test. O’Reilly members experience books. com and run it 2 times. Asking for help, clarification, or responding to other answers. sh on Linux/Unix. How to add ‘Concurrency Thread Group’ in the script? Select ‘Test Plan’ node. In Jmeter, is there any way in which I can gradually increase the thread number (with each thread looping the request lifecycle forever), until condition is met? When the condition is met, the entire test should stop. The loop could be organized in the following way. Share. Improve this answer. Controls the behavior of the flow, by either enabling or disabling flow behavior (such as logging) or by choosing a branch when the flow runs. 5 it's not possible, you have the following options: Instead of setting the duration set the fixed number of iterations in the Thread Group. So basically throughput is the number of requests which JMeter was able to within test duration time frame. If you introduce artificial delay of 3 seconds - it will make the overall throughput lower. g. How to stop a JMeter load test in a few easy steps: Step 1. Add Flow Control Action sampler after the Runtime Controller and set it to "Pause" for 60000 milliseconds Just in case be informed that as per JMeter Best Practices you should always be using the latest version of JMeter so consider upgrading to JMeter 5. What is JMeter flow control action? Flow Control Action sampler is used along with the logical controllers to control the sampler execution. Selenium Integrating with JMeter;. Since JMeter 3. Share. Provide details and share your research! But avoid. The timer will be applied before the sampler is executed. If you don't have Timers or Flow Control Action sampler or Inter-Thread Communication Plugin JMeter executes samplers as fast as it can immediately one after another. They can be SessionID, ViewState, EventValidation etc. FifoTimeout=120 in user. Add __isVarDefined () function to the If Controller's condition, this way the Dummy Sampler will be executed only if the variable set by its child Regular Expression Extractor doesn't exist: If you just want to exit the while loop after the first occurrence of the data you're looking for - add Flow Control Action sampler. 3 Microsoft Windows 10 Enterprise 64-bit java version "14. Follow answered May 21, 2021 at 8:25. To apply a timer after a sampler, either add it to the next sampler, or add it as the child of a Test Action Sampler. 1 Answer. OctoPerf load testing - JMeter settings documentation page. To apply a timer to a single sampler, add the timer as a child element of the sampler. 0) with pause = 0. Flow Control Action is just below the while controller i. In case of HTTPS traffic import JMeter's self-signed certificate to Postman. Test Action had name replaced to Flow Control Action. it allows pauses to be included without needing to generate a sample. Step 2: Pass that Token to the Subsequent API's. Return to HTTP (S) Test Script Recorder, and click the Start button at the top. Flow Control Action Sampler 5 Dummy Sampler Controllers. The if Logic Actions can contain condition expressions. it allows pauses to be included without needing to generate a sample. Source. OS Process, Debug, and Flow Control Action Sampler. JMeter's elements are all about scopes and execution hierarchy. Ram (Bug 63150): Hi Team, Hope you are doing well. If you want to keep the connection open add Flow Control Action sampler and configure it to pause for the desired duration. Think Timeで負荷量を調整した場合、何らかの理由ででサーバ側のレスポンスタイムが落ちた場合、目標スループットは出せなくなる。Once the request is proceesed by the server, its response is returned to JMeter and the same can be viewed and analyzed in terms of different performance parameters like response time, Hits per second, throughput, etc. To open a new test plan (It may prompt to save the current unsaved test plan) CTRL + M. 162k 5 5 gold badges 85 85 silver badges 134 134 bronze badges. The timer will be applied before the sampler is executed. 1. apc. In a JMeter test plan, I have 4 thread groups which will be executed consecutively, however there is a dependency of certain variables from one thread group to another and hence, in case of any sampler failure in previous thread group, the execution of subsequent thread groups should stop. With regards to other approaches most probably the way you're introducing the delay works according to JMeter Scoping Rules and not to your expectations. 2 Answers. The delay can be introduced by either using a. This way first thread group will execute the Login generating or refreshing the. log file. The workaround is to add as first child of Loop Controller a Test Action (renamed to Flow Control Action since 5. Provide details and share your research! But avoid. So just use this __Random () function directly where required. Thread Group Properties: number of threads : 600 ramp up period : 60 Loop count : 5, Add Sampler -> Flow Control Action Select Logical Action on thread as Pause Duration (milliseconds). Jmeter - Dummy Sampler vs Flow Action. To start the server (s), run jmeter-server [. Here is the problem. JMeter load testing is a testing process that determines whether or not web applications under test can satisfy high load requirements. e. Switch from setUp Thread Group for "LoginAPI" to normal Thread Group and configure it to run either desired number of iterations or forever. I want to Control the Throughput at Transaction level, But not at Request/Hits Level. prev. A flow control action is an action that: Does not need a contact or a participant to succeed. If we were to add a Constant Timer to the test and set the delay to be 2000 milliseconds. All major components of Jmeter such as Thread Group, Samplers, Listeners and Config Elements are explained in detail later in the article. You might find Flow Control Action sampler easier to use. Add Flow Control Action sampler as the last Sampler in your "iteration" Add JSR223 Timer as a child of the Flow Control Action Sampler and put the following code. Nhập thời gian bạn muốn: Action này sẽ “Pause” lại trong khoảng từ 600 ms -> 1000 ms. The easiest way of running Token Generation request once per 5 minutes is moving it into a separate Thread Group. If the WebDriver Sampler is the only sampler in the Thread Group you can add i. This way first thread group will execute the Login generating or refreshing the. . you should have N loops (using Loop Controller e. Without these you will not be able to login. Convert setUp Thread Group to "normal" Thread Group Add a Flow Control Action sampler which will introduce delay of, say, 29 minutes and add more loops to the Thread Group; This way each 29 minutes JMeter will request for the new token and update the property holding the token with the new value. In this course, you’ll learn to invoke key features of the latest version of this testing tool to achieve peak performance for your. You can put Flow Control Action sampler under the If Controller and use the following __groovy () function as the condition: $ {__groovy (vars. Add initial controller. Apache JMeter doesn't natively pace based on the number of tests per user. It is an open source tool provided by Apache without licensing cost. This proposal describes possible design of adding flow control to Taurus by adding "logic blocks" to scenario. - Option 2 – use the Debug Sampler and View Results Tree. In the JMeter script, Constant Timer is used to add a constant delay before processing a sampler. JMeter has become an industry-standard tool for conducting functional, load, performance, and regression tests on web applications. Most commonly used test elements are supported natively: a dedicated Virtual User action is created for each one. e. Or by adding the next line to log4j2. Improve this answer. For files other than JMeter scripts and user properties, if the size of the file is greater than 50 MB,. A Constant Throughput Timer element sets the Target Throughput property to your desired rate of samples per minute. 1. The first step is to go to the Apache JMeter folder. 固定定时器Constant Timer作用域总结 前言 本文总结Jmeter实现Loadrunner中Think time的方式，以及Jmeter固定定时器的作用域 一、Think time是什么？ 示例：思考时间. All other relevant JMeter test elements will be imported as Generic Actions: Generic Actions lets you edit the configuration of the associated JMeter test element (here a BSF Post Processor). e. The easiest solution would be creating a separate Thread Group with 1 virtual user and 1 HTTP Request sampler which will be refreshing the token. Use Random JMeter function. Add a Thread Group to Test Plan. It scales web development by helping you measure and analyze application performance. You can create your own implementation of the algorithm using the JSR223 timer. Switch from setUp Thread Group for "LoginAPI" to normal Thread Group and configure it to run either desired number of iterations or forever. 会員登録. JMeter implements this while loop by using the JMeter. getProperty (“file. 1 What are Logical Controllers 2 Once Only Controller 3 Transaction controller 4 Loop controller 5. Timers. Note. If there is another Sampler after it- you can add a Timer as a child of. Flow Control Action sampler is used along with the logical controllers to control the sampler execution. send another 500 requests. I noticed that Flow Control Action when Break current loop is checked has unexpected behavior: When used in Loop, While or ForEach controllers which parent is. Figure 01: JMeter Timer Elements Scope of JMeter Timer: 1. jmeter（三十三）定时器. The script also lets you specify the optional firewall/proxy server information:Sorted by: 42. Save the YAML configuration file and commit it to your source control repositor. Add Flow Control Action sampler after the logintokensso request and configure it to "sleep" for 30 seconds: Or if you have to use the timer for any reason you can still go for the Flow Control Action sampler but with zero delay and make your Constant Timer a child of this Flow Control Action sampler:By default timers, pre and post-processors execution time is not being included into report so the delay might happen but you just don't see it. It can generate reports to help eliminate bottlenecks of the system or to see how it performs under heavy loads. . Follow edited Feb 9, 2016 at 17:56. If you want to "wait a certain time between two requests" the most straightforward option is using Flow Control Action sampler. A Constant Timer element runs in. The flow control container lets you control how often the contained actions are executed. Sorted by: 42. Consider replacing the Constant Timer with the Flow Control Action sampler, it doesn't generate any SampleResult and being called exactly where it's placed just like. In order to make it happen each 10 minutes add Flow Control Action sampler and configure it to introduce delay of 600000 milliseconds. parse("yyyy. requests. We would like to show you a description here but the site won’t allow us. By: RedLine13. You can amend your Thread Group settings to run the Samplers for 1 hour followed by 5 minutes delay. Rather than generate a sample, the test element either pauses or stops the selected target. Name. If you want to learn about downloading and installing JMeter, you can check this video. 11 hours and 30 minutes using Flow Control Action sampler; Pass the token to the main Thread Group which is doing the endurance test by saving it into a JMeter Property in first Thread Group and reading it using __P() function in second Thread GroupAs of JMeter 5. It describes the core concept of JMeter in layman’s terms to clear your basics and make a strong platform of performance testing skills using the JMeter tool. Within each Thread Group, we may place a combination of one or more of other elements − Sampler, Logic Controller, Configuration Element, Listener, and Timer. Authorization code flow. the method is indeed listed in methods in . . 1 you're supposed to use JSR223 Test Elements and Groovy. Scenario 1: I need the iteration to stop after 300 seconds. CheckHoursOfOperation;. The easiest would be just adding a Flow Control Action sampler after the While Controller and configure it like:The execution order of the elements in an Apache JMeter performance test plan is very important, it helps understand the timeline of events and how your test will behave. Stephen Jenkins Jmeter Jan 23, 2023 Add a comment OctoPerf is JMeter on steroids! Schedule a Demo In this blog post we are going to look at several JMeter Controllers, specifically: Simple Controller Transaction Controller Loop Controller While Controller ForEach Controller If Controller Once Only Controller Throughput Controller We re-use the Step 1, 2 in tutorial JMeter Performance Testing. e. To save only the elements located in a particular "branch" of the Test Plan tree, select the Test Plan element in the tree from which to start the "branch", and then click your right mouse button to access the "Save Selection As. setIgnore() See Top 8 JMeter Java Classes You Should Be Using with. A Test Plan comprises of at least one Thread Group. If your question is about suspending/resuming any application, not specifically JMeter, in Linux you can use kill -STOP $ {JMETER_PID} for suspend the process and kill -CONT $ {JMETER_PID} for resume. I want a sampler will be. For instance, if you want to save an HTTP request sampler with a listener, you can save it as a test fragment and use it in other. In the first, there is a Flow is Control action element, which is setup to pause duration for 3600000 msec. Loop Controller. Q2 we don't know, most probably the reason is that your test doesn't run long enough so first thread isn't able to execute all samplers in scenarios 1 and 2 or there are some Logic Controllers which prevent these scenarios execution or there is a Flow Control Action sampler which doesn't allow the thread to go further, etc. There is no need to have a counter, While Controller exposes a special variable, in your case it will be ${__jm__While Controller For Thumbnail-1 QA1. last_sample_ok} 2. To take the screenshot ( G raphics) of the JMeter screen. To pause (sleep) current or all thread for specified amount of time (duration is set in milliseconds).