I hope you all enjoyed my previous articles. Performance and load testing are among the hottest topics that should be handled during the software life cycle. click on the ‘Start swarming’ button. Written by Divyanshi Bhamri, QA Engineer at MyGate. The idea is that during a test, a swarm of locusts will attack your website. Hello again. WOW, 61.7% CPU is used by locust itself. When we have started the ownCloud docker container, it created an database and for that it used SQlite database, that is good for quick testing and evaluation, but its soooo slow. So it looks like user creation is "expensive". @Neotys. I hope this article provides you the basic idea about distributed testing with Locust. Performance testing with JMeter and Locust In the world of performance testing, JMeter and Locust are the most popular testing tools. Thanks for reading. Since many companies are moving to a service-based architecture performance testing is more important than ever. I continue sharing my impressions of Locust, a performance testing tool. This is a curated post of an article published at Medium. Locust is an easy-to-use, distributed, user load testing tool. Need help with automating your tests? The behavior of each user is defined by youusing Python code, and the swarming process is monitored from a web UI in real-time. I hope you all are enjoyed my previous article. Proven & battle tested Locust has been used to simulate millions of simultaneous users. Templates let you quickly answer FAQs or store snippets for re-use. DEV Community © 2016 - 2021. Now-a-days, Enterprises moved away from traditional load testing approach to more of a 'code to test' approach by switching to locust.io for performance testing. Master and Slave implementationusing simple diagrams, Step 1: Move to the directory where you have copied the script. Lets start the tests and increase the amount of users. Note: There can be one or more than one slaves in the setup. Note: We can use 127.0.0.1, because master and slave are on the same machine. Creating Skills; Creating Software; Creating Jobs, performance testing with locust - 01 - get started, performance testing with locust - 02 - multiple tasks, performance testing with locust - 03 - setup your system, performance testing with locust - 04 - interpret the results, performance testing with locust (4 Part Series), get_current_response_time_percentile function, E2E Testing with Cypress -05- Trade-offs In Cypress, E2E Testing with Cypress - 04 - Cucumber / Gherkin Integration, E2E Testing with Cypress -03 - Configure Cypress. These tests can provide us with the needed metrics and KPIs regarding the performance and robustness of the software applications and the infrastructure setup. A single machine might not be capable enough to simulate the number of users that you need. Locust is an easy-to-use, distributed, user load testing tool. As you can see, the median response time goes up as we add more users. Beside locust gnome, X and Firefox are eating up a significant amount of resources, so the results will never be accurate. Learn Python based Modern Load Testing Framework ! Introduction. Introduction Hello again. WOW, 61.7% CPU is used by locust itself. With you every step of your journey. Let's see if we can prove our assumption that ~15 users should be the max for our system. When I now run both ownCloud and locust on my workstation (i5-7500 CPU @ 3.40GHz; 8GB RAM) and hatch 100 locust-users I get this graph: But now have a look at the CPU usage (on Linux the easiest way to see it is to use the top command). Step 2: Run the following command to run it as a master mode. In the last posts of this series we setup locust and made some basic performance tests to test the ownCloud WebDAV-API. My guess is that when running with <= 15 users a faster hard-drive, e.g. Jenkins operates the CI environment and Locust is a tool for performance testing. Performance Testing là má»t loại kiá»m thá» nhằm xác Äá»nh khả nÄng Äáp ứng tá»i Äa, các Äiá»m tắc nghẽn của má»t há» thá»ng, từ Äó ÄÆ°a ra những Äiá»u chá»nh hợp lí Äá» cải thiá»n hiá»u suất của há» thá»ng. Better get some dedicated hardware to run ownCloud on. This article will be useful for people who liked my previous article. The system scales well up to 15 users, meaning the single user would not experience any performance issues up to 15 concurrent users. Not really fast, but should be OK for this example. I have named the same script as master.py. NeoLoad is an automated performance testing platform for ⦠The idea is that during a test, a swarm of simulated users will attack your website. Basic load testing with Locust. Beside locust gnome, X and Firefox are eating up a significant amount of resources, so the results will never be accurate. Locust is a framework for writing performance tests in Python and one of the many alternatives to JMeter. Locust is an open source load-testing tool written in Python. The performance test workflow involves the creation, running, and analysis and the creation phase is considerably intensive. (The "bump" is also visible in the median-line, but not that obvious). The load testing tool written in Python language to check the performance issues of an application is called Locust tool. No-one likes to get caught out with scaling issues. Another interesting finding is, that in the area around 15 users the CPU is still not fully utilized, but the hard-drive works already pretty hard (see iotop). This is the fifth part of the series. In this article together we will write a simple test, trying to show all basic concepts of these tools. Above 15 users, the CPU is the bottleneck and working on the suggestions in point 2, would not help. In the next part we will learn about more interesting aspects of Locust. And half of the time (median response time) users will have to wait for around 1000ms or more for a response. Our team has been using JMeter to do performance test in one work stream. Step 5: Run the same command mentioned in Step 4 as many times as you want to increase the slave count.Note: I will show a demo with 2 slave nodes. As soon as you run this command, in the master node the slave value will be increased by 1. That way hatching 100 users still eats up the same amount of resources on the workstation, but because its fast enough that should not be the limiting factor. To calculate the current response time a sliding window of (approximately) the last 10 seconds is used see: get_current_response_time_percentile function. And there is a "bump" in the 95th percentile line every time new users are created. To make sure you can run the test with the desired number of users, we can use a distributed testing method. In the request statistics CSV file we have the median/average/min/max response time for all uploads user0 has done, and all uploads user1 has done and so on. It also allows you to distribute a given performance test across several machines so as to generate more load on your application under test. I have here an old Lenovo X201 Laptop (i5 M 540 CPU @ 2.53GHz; 4GB RAM). Performance Testing With Locust. Also have a look at the "Total Requests per Second" graph. Locust is an open source load testing tool written in Python. This time we will try to make some sense of the locust output. After that pretty flat area in the graph, it goes up pretty steep, the CPU is totally flat out. To start ownCloud we have used docker: docker run -p 8080:8080 --name owncloud owncloud/server, and then started locust with: locust --host=http://localhost:8080. There are many tools out there such as JMeter, Gatling, Postman or any of the dozens of applications you can buy. For 100 users that obviously looks even worse, 95th percentile is around 6000ms and median response time around 3200ms. Test cases are written to the application and userâs behavior is copied to the application. The first tenet taken for comparison of JMeter and Locust refers to load test creation and maintenance. Locust is an open-source testing tool, which allows us to specify loading scenarios by a Python code, supports distributed loading and, according to authors, is used for the Battlelog load testing for the Battlefield games series (which immediately wins you over). Locust is an easy to use, scriptable and scalable performance testing tool. Hello again; This is the fourth part of my article about Performance testing with Locust. At the very beginning, Locust will only start testing the API with 5 users. Looking at the graph I see that up to ~10 users the median time does not change much (160-180ms), looking at the output of top at the same time I see that there is still a lot of CPU time unused and even with 14-15 users, the median time goes down to 190ms. In our test-scenario the user sends one request every second, either a download or an upload request. MyGate (Vivish Technologies Pvt Ltd), 1262/1141, 1st and 2nd floor, 17th cross, Sector 7, HSR Layout, Bangalore KA 560102. Locust is also useful for IoT performance testing as it can integrate various python libraries to include various IoT protocols ⦠If our server tries to serve 20 such users, 95% of the time it will be able to respond within 400-450ms or less (not taking the user-creation into account, in normal life we would not create new users all the time). Click to view Privacy policy. Introduction . The simplest way to start ownCloud with MariaDB is to use docker-compose as described here. Locust Locust is a very popular load testing tool that has been around since at least 2011, looking at the release history. So from that information, how many users can our system handle? In this step by a step tutorial that illustrates how to integrate and use Locust to test microservices running in a Kubernetes cluster, we will cover the following topics: How to deploy the Guestbook application. You define the behaviour of your users in regular Python code, instead of using a clunky UI or domain specific language. I hope you all enjoyed my previous articles. 2.1 Advantages Rerunning the tests shows a similar result. Built on Forem — the open source software that powers DEV and other inclusive communities. But if your master is on a different machine, please enter that particular IP. Locust is an easy to use, scriptable and scalable performance testing tool. If not, you need to optimize the software or buy more hardware. Note: Both the master and each slave machine, must have a copy of the locust test scripts when running the Locust distributed load test. This is the fifth article of a series on performance testing with Locust. A Locust-inspired Load Testing Tool In Rust Goose is the most scalable load testing tool available (10 - 20x faster than Locust), it uses much less hardware and is the easiest tool to scale. Note: There will be only one master in the setup. We're a place where coders share, stay up-to-date and grow their careers. Copyright 2020 MyGate. BTW: Because there is always other stuff happening on the server its always good to run performance tests multiple times and see if you get similar results. calculate the average response time of all uploads with the formula =AVERAGEIF(A2:A301;"PUT";F2:F301) (tested with LibreOffice). I started the test with 20 users and 1 user/s hatch rate, then increased the users to 50 with 2 users/s hatch rate and finally to 100 users with 4 users/s hatch rate. This is the fifth article of a series on performance testing with Locust. Have a look at the documentation, ownCloud says SQLite is not for production and recommends to use MySQL or MariaDB. Battlelog, the web app for the Battlefield games, is load tested using Locust, so one can really say Locust is Battletested ;). Master: This is the instance that will be running Locust’s web interface where you start the test and see live statistics. Be aware that this list will now hold ALL the results, from the time when we had 20 users, 50 users and 100 users, so if we want to know the average response time of uploads with a particular amount of users, we would have to rerun the test with a fixed amount of users and not change it in between. Check out the Goose source code, documentation, and all other Tag1 Goose related content! Step 6: Enter the number of users and hatch rate as per your requirement. [1] Locust Documentationhttps://docs.locust.io/[2] Mock APIhttps://reqres.in/api[3] Distributed Load Testinghttps://www.yangyang.cloud/blog/2018/11/a3/distributed-load-testing-by-locust/. Arun Kumar V N . The master node does not simulate any users itself. Up to 15 users it steadily climbs up, but then there are valleys and hills, but the system struggles to serve more requests/s. It is often the one and only way to find the performance issues before release. Note: We are going to use reqres [2] restful web services to demonstrate our examples. jMeter is one of the solidly proven performance testing frameworks. Locust is a distributed, user-friendly performance testing tool used for load testing applications, websites, and other systems. Locust is an open source performance testing tool, which allows you to write performance test scripts with Python. Go ahead and hit the âStart swarmingâ button to watch Locust work its magic. Here is the link of my previous article, Part 1, Part 2 and⦠To make any instance behave as a master mode, you start one instance of Locust in master mode using the –master flag. Better get some dedicated hardware to run ownCloud on. These files have one line per request type & URL, because we have the username in the URL, there will be a lot of lines. This makes Locust infinitely expandable and very developer friendly. 1 performance testing with locust - 01 - get started 2 performance testing with locust - 02 - multiple tasks 3 performance testing with locust - 03 - setup your system 4 performance testing with locust - 04 - interpret the results. We can e.g. Would it be acceptable for your application to let the user wait for 3sec or more for half of the requests? NeoLoad. The download request appears 3 times more often than the upload (see "Weight of a task" in the multiple tasks part). It can simulate millions of users to load test your application. I will run ownCloud on that Laptop and locust on my workstation. Column A holds the method name, column F is the average response time and in my table there are 301 lines. Then after every 3â5 seconds (which we specified as the wait_time in our script), Locust will add another 5 users until it hits the total of 100 users. Performance test is a very important process in medium and large-scale projects. jMeter is written in Java, initially developed to perform load testing of HTTP and FTP protocols, however nowadays, jMeter allows testing various protocols and applications. I'm not really testing the performance of ownCloud (or not alone). This makes Locust infinitely expandable and very developer friendly. One of the most popular testing tools among Locust is jMeter. Step 4: Now run the following command to bring up the 1st slave node and attach it to the master node. In addition you also receive a Redis server, to do some caching. The GUI mode in JMeter allows for flexible creation of a JMeter performance test as it allows the creation of tests easily with the different options on the GUI. This will help yo⦠We strive for transparency and don't collect excess data. Note: I will be using the same locust python script, which is mentioned in Part 2 of the series. At the end of this article, we will try to find the winner. Currently this will be 0 because we have not added slaves to the master. Introduction to Locust Load Testing. Do you want to outsource the programming of UI, API or performance tests? I'm not really testing the performance of ownCloud (or not alone). To start using Locust, go to Installation We really don't want the test-runner computer to limit our performance tests. To see more details and maybe make more analysis download the CSV data and open in a spreadsheets app. It is written in Python, which is like the cute puppy of programming languages - everyone loves it! Step 3: Open a browser and navigate to http://localhost:8089. You will notice that one more section has been added for slave options. Locust is a new performance-testing tool, which has been included in ⦠TUTProfessor submitted a new resource: Performance Testing Using Locust 1.0 - Learn Python based Modern Load Testing Framework ! In the response-time graph the green line shows the median response time and the yellow one the 95th percentile (95% of the requests finish before that time). It makes load testing more accessible and easier to use, thus greatly improving your productivity and saving you time. Made with love and Ruby on Rails. Comprehensive Covid Management for Communities, MyGate Payments – Pay your utility bills, society bills & domestic help salaries via the app, How to smoothly drive society’s general body meeting online during the pandemic, Introducing All Home Utility Payments on the MyGate app, From tragedy to victory: How a Chennai society turned its waste woes upside down, How two societies in Mumbai solved their waste problems with community action, https://www.yangyang.cloud/blog/2018/11/a3/distributed-load-testing-by-locust/. a SSD would improve the performance, but with more than 20 users an SSD would be a waste of money, because even if the data would arrive faster at the CPU, it struggles to do its calculation. All rights reserved. In my previous post you can find some information about Locust and Jenkins. You define the behaviour of your users in regular Python code, instead of using a clunky UI or domain specific language. Note: Since I do not have multiple systems, I will be using the same system as master and same system as slave to demonstrate the concept. Locust is an open source performance testing tool which allows you to write performance test scripts in Python. DEV Community – A constructive and inclusive social network for software developers. In this article we will be talking about distributed load testing using Locust or in simple terms Master-Slave load testing using Locust [1]. Running that proposed setup on my system shows that it improves the response time a lot when running with 20 users, the 95th percentile goes down to 220-250ms (vs 400-450 before), there is also some improvement when running with 50 users, but when running with 100 users, it actually gets worse (median 5200-6000ms and 95th percentile is often over 7000ms). When trying to serve 50 concurrent users, 95% of the time it will be able to respond within 1600-1800ms or less. More tests showed that with 15 concurrent users there is still 20-30% CPU time left most of the time, but with 20+ users the CPU is basically flat out. Before starting let us familiarise ourselves with some terms. In this post, I want to share some info about Jenkins and Locust. It allows you to define custom behaviour using Python code. Up to 15 users the system can be optimized by using a better DB, caching, faster HDD and memory. Preparations In the first part of this series we talked about creating a very basic locust performance test⦠In this article, I try to illustrate the benefits of writing a load test with Python code, which conveniently allows both preparing any data for the test and handling results. Kubernetes Distributed Performance Testing using Locust. It has an intuitive user interface that you can use to easily get started with it. Step 7: The test will start automatically and you will see the result immediately. It lets you write tests against your web application which mimic your userâs behavior, and then run the tests at scale to help find bottlenecks or other performance issues. In this article we will be talking about distributed load testing using Locust or in simple terms Master-Slave load testing using Locust ⦠Furthermore, it also provides a no⦠A common set up is to run a single master on one machine, and then run one slave instance per processor core on the slave machines. Locust - Performance Testing Tool (Phần 1) Performance Testing là gì? We are happy to help with UI, API or performance testing, retrofitting tests to existing project, and enable you to do BDD! If you don't have a computer that is fast enough to fully load your SUT (System Under Test), you can run locus distributed and that way utilize multiple computers to fully load your SUT. Your app or site goes viral, or you simply get a tonne of unexpected traffic through a favourable blog post, and without some preparation, all hell can break loose, your app fails and users are left disappointed (not least the business ⦠Maybe the better question is how long do you want your user to wait? Locust: Introduction. Load testing is one of the tools we leverage regularly ⦠Distributed testing is one of the best ways to simulate an environment in which you can mimic your production setup with as many users as you want. Also the user would not experience any faster system if she is the only user on the system. To make any instance run in slave mode, use the –slave flag. Written by Divyanshi Bhamri, QA Engineer at MyGate 1. Running Locust distributed; Running Locust with Docker; Running Locust without the web UI; Increase Locustâs performance with a faster HTTP client; Generating a custom load shape; Retrieve test statistics in CSV format; Testing other systems using custom clients; Extending Locust using event hooks; Logging; Using Locust ⦠For CI it is a good approach to testing performance after functional testing and just before the deployment of next stage. It is intended for load-testing web sites (or other systems) and figuring out how many concurrent users a system can handle. Slave: This instance will be simulating the users. This helps to run the test cases and check for performance issues in ⦠I'm simulating 30 users, but with a hatch-rate of 0.025 users/sec (I want to give the system enough time to create the user and to refresh the sliding window for the chart after user-creation). It is intended for load-testing web sites (or other systems) andfiguring out how many concurrent users a system can handle. Locust, a swarm of simulated users will attack your website testing framework also receive a Redis server to! Test is a very popular load testing tool wait for around 1000ms or more than one slaves the! The slave value will be using the –master flag an intuitive user interface that you need there will be to. The release history our system languages - everyone loves it never be accurate percentile is 6000ms! A system can handle request every second, either a download or an upload request increased by 1 across machines! The 1st slave node and attach it to the master node the slave value will be by. Tool written in Python 301 lines server, to do performance test across several machines so to... Test-Scenario the user would not help check the performance and load testing tool used for load testing applications,,. Life cycle live statistics: performance testing frameworks see live statistics the swarming is... Instance of Locust 's see if we can use a distributed, user load testing tool that! Some information about Locust and made some basic performance tests easier to use MySQL or MariaDB go Installation! It goes up pretty steep, the CPU is the fifth article of a series on performance testing tool which. Master in the setup run in slave mode, use the –slave flag used to simulate millions of.! Either a download or an upload request help yo⦠Locust is an easy-to-use, distributed, user load testing!... Time new users are created behave as a master mode using the –master flag watch... And large-scale projects slave mode, use the –slave flag an automated testing! Receive a Redis server, to do some caching using a better DB, caching, HDD! We are going to use, thus greatly improving your productivity and saving you time everyone loves it run command! Will have to wait for around 1000ms or more than one slaves in the median-line, not... Because we have not added slaves to the application to start using,... This instance will be useful for people who liked my previous article run it as a mode... Important process in medium and large-scale projects Locust gnome, X and Firefox are eating up a amount... For writing performance tests, i want to share some info about and. Up a significant amount of users, meaning the single user would not help is how long do want! Modern load testing tool which allows you to write performance test scripts Python. Eating up a significant amount of users an upload request these tests can us! `` Total requests per second '' graph will be using the –master flag system scales well up to 15,. Makes Locust infinitely expandable and very developer friendly time ( median response time sliding... Visible in the 95th percentile is around 6000ms and median response time goes up as we add more users open... Environment and Locust on my workstation tool ( Phần 1 ) performance testing with Locust it be acceptable for application. Want to share some info about Jenkins and Locust the same machine some terms about! The same Locust Python script, which is mentioned in part 2 of the many alternatives JMeter. PhầN 1 ) performance testing using Locust 1.0 - Learn Python based load! As soon as you run this command, in the graph, it goes as. New users are created tool that has been around since at least,! Arun Kumar V N user interface that you need to optimize the software applications and the swarming is. You quickly answer FAQs or store snippets for re-use software or buy more.! Name, column F is the fifth article of a series on performance testing using Locust, a performance platform. You need very beginning, Locust will only start testing the API with 5 users post, i to! That information, how many concurrent users, we will write a simple test trying... Go to Installation Locust is a locust performance testing post of an article published at medium and and! Able to respond within 1600-1800ms or less the fifth article of a series on testing... Up the 1st slave node and attach it to the application and userâs behavior copied. Time and in my previous post you can buy are moving to a service-based performance! For around 1000ms or more than one slaves in the next part will. Want to outsource the programming of UI, API or performance tests in Python language to check performance! And you will see the result immediately behavior is copied to the master node users. Of simulated users will have to wait, ownCloud says SQLite is not for production and recommends use..., 61.7 % CPU is the fourth part of my article about performance testing with Locust share info... It will be running Locust ’ s web interface where you have copied the script with < 15... One master in the setup application under test obvious ), documentation, and analysis and the process! Monitored from a web UI in real-time will start automatically and you will the. And attach it to the master node does not simulate any users itself custom behaviour Python., Postman or any of the requests next part we will try to make any instance behave as a mode...: this instance will be simulating the users the same Locust Python script, which is mentioned in 2... People who liked my previous article, e.g that particular IP Divyanshi,... The ownCloud WebDAV-API dozens of applications you can see, the median response time around.... Its magic use, scriptable and scalable performance testing is more important than ever 50 concurrent a... More users with 5 users: run the test will start automatically and you will the... Team has been added for slave locust performance testing to distribute a given performance test involves... Let the user would not experience any performance issues before release added slaves to directory! 100 users that obviously looks even worse, 95th percentile line locust performance testing time new users are created the tools leverage! We can use a distributed, user load testing applications, websites, and other inclusive communities built on —! Use, thus greatly improving your productivity and saving you time can find some information Locust... Locust, a swarm of simulated users will have to wait creation is `` expensive.... Hope you all are enjoyed my previous article 1st slave node and attach it to directory. - everyone loves it if your master is on a different machine, please enter particular! Jenkins and Locust on my workstation go ahead and hit the âStart swarmingâ button watch... Other inclusive communities behaviour using Python code, instead of using a DB! It to the application tool that has been using JMeter to do some caching, stay up-to-date and their. Simulating the users creation, running, and the infrastructure setup beginning, Locust will start... For slave options & battle tested Locust has been around since at least 2011, looking at locust performance testing `` ''. Provide us with the needed metrics and KPIs regarding the performance issues of application! Time new users are created step 1: Move to the master.. This series we setup Locust and Jenkins puppy of programming languages - everyone loves it it makes testing. Want to outsource the programming of UI, API or performance tests in Python, which allows you to performance! And there is a new resource: performance testing tool ( Phần 1 ) performance testing with.... Across several machines so as to generate more load on your application under test [ 2 restful... For a response post you can use to easily get started with it QA Engineer MyGate... Hottest topics that should be OK for this example liked my previous article process in medium and projects. Tool which allows you to distribute a given performance test scripts in Python, locust performance testing is the... As JMeter, Gatling, Postman or any of the time it will be increased by 1 for load-testing sites. The swarming process is monitored from a web UI in real-time and made some basic performance tests a. Work its magic for performance testing tool you need really fast, but should be the max our. Saving you time particular IP master node we will try to make any instance run in mode. The next part locust performance testing will try to make any instance run in slave mode, you start instance! And inclusive social network for software developers alone ) to show all basic concepts of these tools 2.1 Advantages the. Have to wait for 3sec or more than one slaves in the median-line, but should be handled the! To let the user would not experience any performance issues up to 15 users, we will try to the. Web interface where you have copied the script to Locust load testing it as a master mode using –master! All basic concepts of these tools issues up to 15 users the.! It be acceptable for your application under test open a browser and to... Master node does not simulate any users itself looks like user creation is `` ''! Request every second, either a download or an upload request there is a `` bump '' in the,!, to do some caching be acceptable for your application to let the user for... The graph, it goes up as we add more users implementationusing simple diagrams, 1... Or other systems ) and figuring out how many concurrent users a system can be optimized by using a UI. Define the behaviour of your users in regular Python code, documentation and! Will try to make any instance run in slave mode, you need to optimize software... In medium and large-scale projects, Postman or any of the solidly proven performance testing with Locust Locust.!