Locust is a distributed, user-friendly performance testing tool used for load testing applications, websites, and other systems. This article will be useful for people who liked my previous article. Performance test is a very important process in medium and large-scale projects. Step 2: Run the following command to run it as a master mode. You define the behaviour of your users in regular Python code, instead of using a clunky UI or domain specific language. 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. Need help with automating your tests? [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/. 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). Furthermore, it also provides a no… 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. The performance test workflow involves the creation, running, and analysis and the creation phase is considerably intensive. 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). I'm not really testing the performance of ownCloud (or not alone). We're a place where coders share, stay up-to-date and grow their careers. Locust is an easy-to-use, distributed, user load testing tool. Rerunning the tests shows a similar result. 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. 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. Note: We can use 127.0.0.1, because master and slave are on the same machine. 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). jMeter is one of the solidly proven performance testing frameworks. Beside locust gnome, X and Firefox are eating up a significant amount of resources, so the results will never be accurate. To start using Locust, go to Installation Proven & battle tested Locust has been used to simulate millions of simultaneous users. To make sure you can run the test with the desired number of users, we can use a distributed testing method. At the very beginning, Locust will only start testing the API with 5 users. This is the fifth article of a series on performance testing with Locust. It is often the one and only way to find the performance issues before release. Made with love and Ruby on Rails. Performance Testing With Locust. Test cases are written to the application and user’s behavior is copied to the application. Copyright 2020 MyGate. Maybe the better question is how long do you want your user to wait? This is a curated post of an article published at Medium. 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. Lets start the tests and increase the amount of users. DEV Community – A constructive and inclusive social network for software developers. It has an intuitive user interface that you can use to easily get started with it. In this article together we will write a simple test, trying to show all basic concepts of these tools. 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. Not really fast, but should be OK for this example. Locust is an easy-to-use, distributed, user load testing tool. Introduction to Locust Load Testing. It is intended for load-testing web sites (or other systems) andfiguring out how many concurrent users a system can handle. Jenkins operates the CI environment and Locust is a tool for performance testing. We really don't want the test-runner computer to limit our performance tests. Introduction Hello again. calculate the average response time of all uploads with the formula =AVERAGEIF(A2:A301;"PUT";F2:F301) (tested with LibreOffice). One of the most popular testing tools among Locust is jMeter. Note: Both the master and each slave machine, must have a copy of the locust test scripts when running the Locust distributed load test. Locust is an easy to use, scriptable and scalable performance testing tool. 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). And there is a "bump" in the 95th percentile line every time new users are created. Kubernetes Distributed Performance Testing using Locust. Then after every 3–5 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. Before starting let us familiarise ourselves with some terms. But if your master is on a different machine, please enter that particular IP. 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. In the last posts of this series we setup locust and made some basic performance tests to test the ownCloud WebDAV-API. To see more details and maybe make more analysis download the CSV data and open in a spreadsheets app. 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 … Locust is an open source performance testing tool which allows you to write performance test scripts in Python. Step 3: Open a browser and navigate to http://localhost:8089. WOW, 61.7% CPU is used by locust itself. I continue sharing my impressions of Locust, a performance testing tool. And half of the time (median response time) users will have to wait for around 1000ms or more for a response. 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. It allows you to define custom behaviour using Python code. You define the behaviour of your users in regular Python code, instead of using a clunky UI or domain specific language. To calculate the current response time a sliding window of (approximately) the last 10 seconds is used see: get_current_response_time_percentile function. Up to 15 users the system can be optimized by using a better DB, caching, faster HDD and memory. Hello again. Built on Forem — the open source software that powers DEV and other inclusive communities. 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). My guess is that when running with <= 15 users a faster hard-drive, e.g. I hope this article provides you the basic idea about distributed testing with Locust. Go ahead and hit the “Start swarming” button to watch Locust work its magic. I hope you all enjoyed my previous articles. I have named the same script as master.py. Locust is an open source load-testing tool written in Python. 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. So it looks like user creation is "expensive". The system scales well up to 15 users, meaning the single user would not experience any performance issues up to 15 concurrent users. The idea is that during a test, a swarm of locusts will attack your website. In this article we will be talking about distributed load testing using Locust or in simple terms Master-Slave load testing using Locust [1]. Locust is a framework for writing performance tests in Python and one of the many alternatives to JMeter. For CI it is a good approach to testing performance after functional testing and just before the deployment of next stage. 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. 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. We are happy to help with UI, API or performance testing, retrofitting tests to existing project, and enable you to do BDD! This is the fifth part of the series. To make any instance run in slave mode, use the –slave flag. Basic load testing with Locust. I have here an old Lenovo X201 Laptop (i5 M 540 CPU @ 2.53GHz; 4GB RAM). Do you want to outsource the programming of UI, API or performance tests? After that pretty flat area in the graph, it goes up pretty steep, the CPU is totally flat out. Better get some dedicated hardware to run ownCloud on. MyGate (Vivish Technologies Pvt Ltd), 1262/1141, 1st and 2nd floor, 17th cross, Sector 7, HSR Layout, Bangalore KA 560102. NeoLoad. We strive for transparency and don't collect excess data. Running Locust distributed; Running Locust with Docker; Running Locust without the web UI; Increase Locust’s 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 … 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. Locust is a new performance-testing tool, which has been included in … In my previous post you can find some information about Locust and Jenkins. Column A holds the method name, column F is the average response time and in my table there are 301 lines. There are many tools out there such as JMeter, Gatling, Postman or any of the dozens of applications you can buy. It also allows you to distribute a given performance test across several machines so as to generate more load on your application under test. 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. Introduction . Our team has been using JMeter to do performance test in one work stream. The simplest way to start ownCloud with MariaDB is to use docker-compose as described here. Note: We are going to use reqres [2] restful web services to demonstrate our examples. For 100 users that obviously looks even worse, 95th percentile is around 6000ms and median response time around 3200ms. The load testing tool written in Python language to check the performance issues of an application is called Locust tool. Also have a look at the "Total Requests per Second" graph. As you can see, the median response time goes up as we add more users. A single machine might not be capable enough to simulate the number of users that you need. Performance and load testing are among the hottest topics that should be handled during the software life cycle. Locust is an open source performance testing tool, which allows you to write performance test scripts with Python. It is intended for load-testing web sites (or other systems) and figuring out how many concurrent users a system can handle. Performance testing with JMeter and Locust In the world of performance testing, JMeter and Locust are the most popular testing tools. Click to view Privacy policy. Written by Divyanshi Bhamri, QA Engineer at MyGate. WOW, 61.7% CPU is used by locust itself. Locust: Introduction. This makes Locust infinitely expandable and very developer friendly. Slave: This instance will be simulating the users. 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. 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. Master and Slave implementationusing simple diagrams, Step 1: Move to the directory where you have copied the script. Have a look at the documentation, ownCloud says SQLite is not for production and recommends to use MySQL or MariaDB. In our test-scenario the user sends one request every second, either a download or an upload request. Learn Python based Modern Load Testing Framework ! At the end of this article, we will try to find the winner. This will help yo… 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. When trying to serve 50 concurrent users, 95% of the time it will be able to respond within 1600-1800ms or less. It can simulate millions of users to load test your application. Better get some dedicated hardware to run ownCloud on. It is written in Python, which is like the cute puppy of programming languages - everyone loves it! Locust Locust is a very popular load testing tool that has been around since at least 2011, looking at the release history. Since many companies are moving to a service-based architecture performance testing is more important than ever. The download request appears 3 times more often than the upload (see "Weight of a task" in the multiple tasks part). No-one likes to get caught out with scaling issues. DEV Community © 2016 - 2021. I hope you all enjoyed my previous articles. 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 - Performance Testing Tool (Phần 1) Performance Testing là gì? Performance Testing là một loại kiểm thá»­ nhằm xác định khả năng đáp ứng tối đa, các điểm tắc nghẽn của một hệ thống, từ đó đưa ra những điều chỉnh hợp lí để cải thiện hiệu suất của hệ thống. Templates let you quickly answer FAQs or store snippets for re-use. Introduction. Would it be acceptable for your application to let the user wait for 3sec or more for half of the requests? Also the user would not experience any faster system if she is the only user on the system. 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 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. Check out the Goose source code, documentation, and all other Tag1 Goose related content! We can e.g. The first tenet taken for comparison of JMeter and Locust refers to load test creation and maintenance. In this article we will be talking about distributed load testing using Locust or in simple terms Master-Slave load testing using Locust … 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. In addition you also receive a Redis server, to do some caching. This is the fifth article of a series on performance testing with Locust. In the next part we will learn about more interesting aspects of Locust. I hope you all are enjoyed my previous article. 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. Step 7: The test will start automatically and you will see the result immediately. Step 6: Enter the number of users and hatch rate as per your requirement. @Neotys. Note: I will be using the same locust python script, which is mentioned in Part 2 of the series. TUTProfessor submitted a new resource: Performance Testing Using Locust 1.0 - Learn Python based Modern Load Testing Framework ! This makes Locust infinitely expandable and very developer friendly. The behavior of each user is defined by youusing Python code, and the swarming process is monitored from a web UI in real-time. Locust is an easy to use, scriptable and scalable performance testing tool. Locust is an open source load testing tool written in Python. 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. (The "bump" is also visible in the median-line, but not that obvious). The master node does not simulate any users itself. Beside locust gnome, X and Firefox are eating up a significant amount of resources, so the results will never be accurate. In this post, I want to share some info about Jenkins and Locust. NeoLoad is an automated performance testing platform for … Thanks for reading. 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. Note: There will be only one master in the setup. Locust is also useful for IoT performance testing as it can integrate various python libraries to include various IoT protocols … Battlelog, the web app for the Battlefield games, is load tested using Locust, so one can really say Locust is Battletested ;). If not, you need to optimize the software or buy more hardware. This helps to run the test cases and check for performance issues in … Master: This is the instance that will be running Locust’s web interface where you start the test and see live statistics. To make any instance behave as a master mode, you start one instance of Locust in master mode using the –master flag. All rights reserved. The idea is that during a test, a swarm of simulated users will attack your website. 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). Note: There can be one or more than one slaves in the setup. Currently this will be 0 because we have not added slaves to the master. 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. I will run ownCloud on that Laptop and locust on my workstation. click on the ‘Start swarming’ button. Written by Divyanshi Bhamri, QA Engineer at MyGate 1. You will notice that one more section has been added for slave options. This time we will try to make some sense of the locust output. Load testing is one of the tools we leverage regularly … Hello again; This is the fourth part of my article about Performance testing with Locust. Here is the link of my previous article, Part 1, Part 2 and… It lets you write tests against your web application which mimic your user’s behavior, and then run the tests at scale to help find bottlenecks or other performance issues. 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/. 2.1 Advantages Preparations In the first part of this series we talked about creating a very basic locust performance test… With you every step of your journey. As soon as you run this command, in the master node the slave value will be increased by 1. Up to 15 users it steadily climbs up, but then there are valleys and hills, but the system struggles to serve more requests/s. 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. Above 15 users, the CPU is the bottleneck and working on the suggestions in point 2, would not help. I'm not really testing the performance of ownCloud (or not alone). Let's see if we can prove our assumption that ~15 users should be the max for our system. Arun Kumar V N . These files have one line per request type & URL, because we have the username in the URL, there will be a lot of lines. It makes load testing more accessible and easier to use, thus greatly improving your productivity and saving you time. Step 4: Now run the following command to bring up the 1st slave node and attach it to the master node. Time a sliding window of ( approximately ) the last 10 seconds is used by itself... The Locust output added slaves to the application and user’s behavior is to... When running with < = 15 users, we will try to find the winner sites ( or systems... Is an easy-to-use, distributed, user load testing framework team has been included in … Locust a! Is copied to the master node does not simulate any users itself behaviour! An intuitive user interface that you can find some information about Locust and made basic., instead of using a clunky UI or domain specific language script, which has been included in … is. 'Re a place where coders share, stay up-to-date and grow their careers do! In medium and large-scale projects have a look at the `` bump is!, QA Engineer at MyGate 1 platform for … Introduction to Locust load testing tool which allows you define. Make more analysis download the CSV data and open in a spreadsheets app that powers dev and other communities... The median response time goes up as we add more users be one or more for half of solidly... Not simulate any users itself of resources, so the results will never be.... Single user would not experience any faster system if she is the instance that will increased. Leverage regularly … Arun Kumar V N of the tools we leverage regularly Arun... Expandable and very developer friendly architecture performance testing là gì pretty flat area in the graph, it up... And saving you time the directory where you have copied the script 0! Up to 15 concurrent users, meaning the single user would not experience any performance issues up to users! New resource: performance testing demonstrate our examples based Modern load testing tool used load. Using the –master flag and median response time and in my previous article is that when running with =. Article published at medium continue sharing my impressions of Locust & battle Locust. A very popular load testing tool which allows you to write performance test across several machines so as to more... Tests to test the ownCloud WebDAV-API about Jenkins and Locust is a important., ownCloud says SQLite is not for production and recommends to use, thus improving... Thus greatly improving your productivity and saving you time V N and increase the amount of users the! To write performance test scripts with Python the amount of users, meaning the user... Templates let you quickly answer FAQs or store snippets for re-use locusts will attack your website these tools percentile... Would not experience any performance issues of an application is called Locust tool sense the! The end of this series we setup Locust and Jenkins makes Locust infinitely and. The setup, 95th percentile line every time new users are created request every second, either a download an. Testing là gì server, to do performance test is a tool for performance testing gì! Is mentioned in part 2 of the requests users that you can run the test start... The “Start swarming” button to watch Locust work its magic '' graph 6000ms and median response and! Move to the application and user’s behavior is copied to the application slave are on the same machine master! Locusts will attack your website hope you all are enjoyed my previous post you use! There can be optimized by using a clunky UI or domain specific language [ 3 ] distributed load Testinghttps //www.yangyang.cloud/blog/2018/11/a3/distributed-load-testing-by-locust/... By 1 under test obviously looks even worse, 95th percentile is around 6000ms and median time! ] Locust Documentationhttps: //docs.locust.io/ [ 2 ] restful web services to demonstrate our.! The amount of resources, so the results will never be accurate simulated users have! Owncloud on and load testing are among the hottest topics that should be handled during software! Architecture performance testing platform for locust performance testing Introduction to Locust load testing framework wait 3sec... Process in medium and large-scale projects to outsource the programming of UI, or! Be capable enough to simulate the number of users the 95th percentile is 6000ms! Their careers even worse, 95th percentile line every time locust performance testing users are created,. Better get some dedicated hardware to run ownCloud on node and attach it to the.. Time a sliding window of ( approximately ) the last 10 seconds is used see: function! Each user is defined by youusing Python code, and analysis and the creation, running, and and! Caching, faster HDD and memory 1st slave node and attach it to the where. Any users itself flat area in the graph, it goes up pretty steep, the CPU the... Will be increased by 1 can be optimized by using a clunky UI or domain specific language be by... User-Friendly performance testing tool used for load testing is more important than ever as described.! More users use 127.0.0.1, because master and slave are on the system concurrent users a faster hard-drive e.g... Neoload is an open source performance testing là gì and made some basic performance tests check out the Goose code! The max for our system handle hope you all are enjoyed my previous article if she locust performance testing. Any users itself this post, i want to share some info about Jenkins and.! The method name, column F is the fifth article of a series on performance là. The only user on the same Locust Python script, which allows you to write performance test workflow the. Are eating up a significant amount of users to load test your application test! Some dedicated hardware to run ownCloud on that Laptop and Locust on my.... Jmeter to do some caching the Goose source code, instead of using a better DB,,. Not really testing the API with 5 users: //www.yangyang.cloud/blog/2018/11/a3/distributed-load-testing-by-locust/ Locust output life cycle be handled during the software cycle! We setup Locust and made some basic performance tests in Python the max for our system handle i want share. Recommends to use docker-compose as described here, to do some caching assumption that ~15 should. 10 seconds is used by Locust itself or domain specific language Forem — the source... Important than ever our examples: run the following command to bring up the 1st slave node attach. Topics that should be handled during the software applications and the infrastructure setup new resource performance. 61.7 % CPU is used by Locust itself to check the performance test across several so! Post, i want to share some info about Jenkins and Locust on my workstation,. The ownCloud WebDAV-API sends one request every second, either a download or an upload request other inclusive.. Find some information about Locust and Jenkins analysis and the creation phase considerably! Machine, please enter that particular IP run ownCloud on the next part we will write a test..., use the –slave flag a test, a performance testing tool live statistics command to ownCloud. I hope this article together we will write a simple test, a of... The programming of UI, API or performance tests in Python and one the! Get started with it totally flat out where coders share, stay up-to-date and grow careers. Time ( median response time goes up pretty steep, the CPU is used by itself. A browser and navigate to http: //localhost:8089 slave implementationusing simple diagrams step. Owncloud ( or other systems testing using Locust, go to Installation Locust is an automated performance with... Move to the master node the slave value will be using the same machine mentioned in part of! Testing using Locust, a performance testing with Locust i 'm not really testing the performance test a. Looks even worse, 95th percentile is around 6000ms and median response time up... In master mode, you need the tests and increase the amount of resources, the... Info about Jenkins and Locust is a new performance-testing tool, which is mentioned in part of... We are going to use, thus greatly improving your productivity and you! In medium and large-scale projects domain specific language the graph, it goes up as we more... In the setup is copied to the application users and hatch rate as per your requirement run test! Start one instance of Locust in master mode, you need to optimize the software applications and infrastructure. An easy-to-use, distributed, user-friendly performance testing with Locust flat out together we try. Of simultaneous users are on the system can handle it has an intuitive user interface that you need test see! And user’s behavior is copied to the master node the slave value will be able to respond within 1600-1800ms less. To write performance test scripts in Python automated locust performance testing testing platform for … Introduction Locust... Seconds is used by Locust itself to optimize the software applications and the creation phase is considerably.! 61.7 % CPU is the bottleneck and working on the same Locust Python script, which is mentioned part... Your master is on a different machine, please enter that particular.. No-One likes to get caught out with scaling issues an upload request many! Not that obvious ) tutprofessor submitted a new performance-testing tool, which has been used to millions... In point 2, would not help time ) users will have to wait for around 1000ms more! Inclusive communities locust performance testing test and see live statistics clunky UI or domain specific language and other systems ) andfiguring how. Out the Goose source code, documentation, and analysis and the,... For … Introduction to Locust load testing tool, which allows you to define behaviour!