Although we do not know which functions will be called by each user and their order (they will be selected randomly), we guarantee that index function will be called, on average, twice as often as profile function. This article demonstrates an example to use locust for load testing of our django web application. We have used it in testing the Python endpoints of a GPU-based database for one of our clients. It will then wait a number of milliseconds, chosen at random between the Locust class’ min_wait and max_wait attributes. It can be installed using the following command: python -m pip install locustio Installation details are described in pip install appian-locust Configure your test to point at the Appian instance you will be using. Is it possible to attach a debugger while running a locust script? Now, open a browser in your host machine and go to http://localhost:8089. It is simple and easy to use with web UI to view the test results. Locust.io is an open source Python-based user load testing tool. You can also send additional data in the PUT request using data parameter. Save this to a file named locust-example.py. I have many Locust classes and I want to use Locust as a library. $ locust -f examples/basic.py --csv=example --no-web -t10m 文件将被命名为example_response_times.csv 和 example_stats.csv (使用--csv=example)并记录Locust构建的信息。如果你想要更快(慢)的写入速度,也可以自动以写入频率: import locust.stats # 默 Please fill in this quick form to be among the first to receive our updates. It simply figures out how many concurrent users an application handle. Please look out for our email occasionally (and don’t forget to check your junk folder). This will help you battle test and identifybottlenecks in your code before letting real users in. A locust class represents one user (or a swarming locust if you will). Python is necessary to start, and I will use version 3.6 and Locust itself (at the moment of writing the article — version 0.9.0) in all examples. See what we do for the customers. Flask is a very common (and amazing!) In our “spark” container, we have already included a simple web server that you can use in following this tutorial. This will launch your task definitions as well as Locust's internal flask engine for controlling the test and displaying both the … It is scalable and can be distributed over multiple machines. This talk was presented at PyBay2019 - 4th annual Bay Area Regional Python conference. Note that the class MyTaskSet also has a method called on_start. (Due to the limitation of CPU performance of your machine, the actual hatch rate might be smaller than the number you specify.). What happens then is that each TaskSet will pick one of its tasks and call it. We can run Locust without the web UI and save only the summary to the file summary.txt by the following command: The --only-summary option tells Locust to suppress the stats output during the test and only print the summary. Just use Python to write the scheme you want to test, and then put “locust” to connect the project you want to test. 图表相对loadrunner 比较简单。 I send a post request using my user name and password but to get the token a body data which is raw text grant_type=client_credentials&scope=Dashboard must contain in the request. Locust is based on coroutines rather than callbacks, which makes your code execute synchronously similar to normal Python blocking code. So with our task definition: getList would be 2 times more likely to be executed than previewPage. 开源。 缺点:1. The second way is to specify methods inside UserBehavior class: from locust import HttpLocust, TaskSet, task. # An example on how to use and nest TaskSets from locust import HttpUser, TaskSet, task, between class ForumThread (TaskSet): pass class ForumPage (TaskSet): # wait_time can be overridden for individual TaskSets wait_time = between (10, 300) # TaskSets can be nested multiple levels tasks = {ForumThread: 3} @ task (3) def forum_index (self): pass @ task (1) def stop (self): self. A fundamental feature of locust is that you can describe all your test case in python code. Start the server in the background through the following command: The command > /dev/null silences the output and & executes the command in a child process detached from the current shell, so that you are not stuck waiting for the completion of the process. In this class, we set user’s behavior model UserBehavior, and minimum and maximum time of waiting between calls of each user’s separate tasks. Locust. Your message is highly valuable for us. Each locust swarming your site is actually running inside its own process (or greenlet, to be correct). Note: With this simple web app, you just need to specify that you're using Python 3.8. If you start talking about performance testing, everybody thinks about JMeter first, as it undoubtedly remains the most known tool with the biggest number of plugins. client. You can press this button to stop the ongoing test. In this blog post I will share some examples of basic load testing against web services. When tasks is set to a dictionary — with function names as keys and integer numbers as values — the task that is to be executed will be chosen at random but with the integer value as ratio. When you start working, open the main page once. Each Locust class must have a task_set attribute set, that points to a TaskSet. -c specifies the number of users, -r specifies the hatch rate and -t specifies the run time for a Locust test (otherwise the process will run forever!). I have taken the server’s data from the  . Please fill in this quick form and we will send you a free quote shortly. Tasks property will be supplied from a methods dictionary, called by a user, as well as frequency of calls. The idea is that during a test, a swarm of simulated users will attack your website. LocustIO, an open source tool written in python, is used for load testing of web applications. Learn how we made our clients happy. See who our customers are. Making a POST request and extracting data from HTTP response by using JSON path. We do have a reason to reset the stats when STATUS changes from “HATCHING” to “RUNNING”: To get to the “RUNNING” stage as fast as possible, usually you need to ramp up your Locusts (users) quickly in “HATCHING” stage. I say “almost identical” because in this example we input not a full path URL as the first argument, but only its part, i.e. Obvious spoiler: experiments with performance testing are better performed locally, without loading online services to avoid being banned. 完全基于事件驱动,所以不受进程和线程的限制,可以支持发起更高的并发数请求。3. I want to get an authorization token using basic authorization. Read more >, Our Blog Each Locust class must have a task_set attribute set, that points to a TaskSet. Check out new ideas and best practices for the IT world. But if the server returns mistakes 4ХХ or 5ХХ — their text will be recorded specifically here. These are the minimum and maximum time respectively, in milliseconds, that a simulated user will wait between executing each task. And now, inspired by successful testing within two different projects, I’ve decided to share some information about a relatively simple and convenient software —  . If an error occurs, it will be recorded and added to the load statistics. As expected, each of 10 created users appeared on the main page at the very beginning. Simple documentation, including a copy-paste example. Our Services Then it will again pick a new task to be called, wait again, and so on. and start a Locust Web UI server based on the downloaded file: The above command specifies the “locust file” (-f), which defines the “behavior of the locust (= user)” such as how many requests are issued at what intervals, etc. It will help you avoid the problems I faced. There are two possible solutions for this situation: Start another shell (either using tmux or by the docker exec -it spark /bin/bash command), and issue your next command in the new shell. There is an average and a median time of response for each operation, and quantity of operations per second, which is already useful information, which can be used to compare actual performance with the expected result. | Functionally, nothing has changed. Learn more >, Case Studies Here we can also set the quantity of users to create the load, as well as their increment per second. Now you should be able to issue a command. Load testing with Python and Locust. After this article, you will learn JSONPath usage with Locust. Let us think about it a little. Any testing is a complex task that requires planning, preparation, performance control, and results analysis. by Kubilay Kahveci At: FOSDEM 2018 Room: H.2213 Scheduled start: 2018-02-03 13:15:00+01 You define the behaviour of your users in regular Python code, instead of using a clunky UI or domain specific language. In the meantime, you might be interested in learning more about the following: In the meantime, you might be interested in the following: Manual vs. The percentage of requests that fails due to a connection error, timeout, page not found, bad request or similar reason. This lightweight, distributed and scalable framework helps to figure out how many concurrent users a system can handle by writing test scenarios in Python code. Software servers (OS, server version, JAVA, .NET, and others, database and data quantity, server and tested application logs); Proxy-servers, load balancers and DDOS shield presence; Performance testing data (users quantity, response average time, queries quantity per second). It is possible to begin testing with just basic programming skills. The status shows “HATCHING” in the beginning when new users are spawned, but once the specified number of users have been spawned, the status changes to “RUNNING” and shows the number of concurrent users, 200 in our example. As the name suggests, this class will describe the behavior of a spherical user in the vacuum of tested application. framework. A Python-based alternative to Tsung and JMeter for load testing your server(or websites). Our MyLocust class includes the following three attributes: task_set attribute: The task_set attribute should point to a TaskSet class which defines the behavior of the user and is described in more detail below. One common way of declaring tasks for a TaskSet it by settings its tasks attribute. It can be installed using the following command: Installation details are described in official documentation. I installed locustio on my ubuntu using pip "pip install locustio" the problem is that everytime I run any locust command on my console (for example) locust --version the console returns this ... Make sure the scripts are installed in a directory that is available in your PATH environment variable. I will describe a few examples which easily can be configured to match additional needs and requirements. These tasks are normal python callables and—if we were load-testing an auction website—could do stuff like “loading the We often fail to consider the performance of our apps until they’re in production, but by then it may be too late! When you execute the above command, you are likely to see the following output, which means that Locust Web UI is now running. Locust will look for ~/.locust.conf and ./locust.conf by default, and you can specify an additional file using the --config flag. Locust runs in a Python environment so you need to setup Python and its package install tools, if you don’t already have them. Features Write user test scenarios in plain-old Python Change the number of users, say to 500, and rerun the tasks to see how the performance changes. It is also worth pointing out that we do not process the request result in any way — if it is successful, the results (cookies for instance) will be saved in this session. It is not currently compatible with Python 3.x. For example, here is the locust class that is defined in our locust_file.py: class MyLocust(HttpLocust): task_set = MyTaskSet min_wait = 1000 max_wait = 2000 Note that our locust class, MyLocust , inherits from HttpLocust (a subclass of Locust for generating HTTP requests). Subscribe to our New career opportunities. Now you have learned enough about Locust to finish this project. Locust is fairly straight forward to use; import the needed classes, write a HttpLocust class and at least one task, then run your project with locust -f . These tasks are normal python functions and — if we were load-testing an auction website — could do stuff like “loading the start page”, “searching for some product” and “making a bid”. Introduction to Locust.io - Today we are going to introduce to you Locust.io. response=r.post(base_url+”/login”,{“username”:”ellen_key”,”password”:”education”}) The behavior of each locust (or test user if you will) is defined by you and the swarming process is monitored from a web UI in real-time. Python is necessary to start, and I will use version 3.6 and Locust itself (at the moment of writing the article — version 0.9.0) in all examples. Further, we need a test file. By using this web site you accept our use of cookies. The time format should be in XhYmZs (X hours, Y minutes and Z seconds). Privacy Policy On average the posts list was opened two times more frequently than comments were written. The behavior of each user is defined by youusing Python code, and the swarming process is monitored from a web UI in real-time. For example, our gestList function, sends two GET requests to the server and our previewPage function. Example … If you drop the flag --reset-stats in the command, you will be able to see exactly 100 requests from POST /login. All rights reserved. It is simple and easy to use with web UI to view the test results. Here is the definition of our MyTaskSet that inherits from TaskSet: The tasks attribute is either a list of python functions, or a python dictionary of pairs like the above example. sends one GET request to the server with a random postid. GUI 환경이 아님 2. python 테스트 시나리오를 작성하고 수행하면 끝 3. The HttpLocust class includes some additional helpers to simplify http requests and session management. | As for me, I have never liked JMeter because of unfriendly interface and high learning curve which you face each time when it’s required to test something more complicated than a “Hello World” application. There are a few attributes that a locust class should typically define. 易用。很方便地基于Python进行脚本扩展和业务请求实现。2. では、nginx で設定した locust.example.org にアクセスしてみます。 問題がなければ、以下の設定が表示されます。 やはりこのツール、何年か前に Python 好きなエンジニアの人が使っていて紹介されたも … l.client is the object of HTTP session, which we are going to use to create the loading. Here’s a simple python test script for Locust.io. Read more >, Latest News Forewords. Before you proceed, take a quick look at our sample locust file, locust_file.py, to get a sense of what the file looks like. Be among the first to get exclusive content on IT insights, innovations, and best practices. Imprint. Here's an example file structure of an imaginary Locust project: Project root common/ __init__.py auth.py config.py locustfile.py 简介:locust 是Python实现的一个性能测试工具。优点:1. We can measure performance even without having any information about the application under test and without access to the logs. The locust class has to declare a tasks attribute which is either a list of python callables or a dict. Locust will spawn (hatch) one instance of the locust class for each user that is being simulated. Learn more >, Testimonials (http://localhost:3000 in our case). Next several functions are requests that will create the load. You define the behaviour of your users in regular Python code, instead of using a clunky UI or domain specific language. If you click this button, all stats will be reset to zero. A TaskSet is, like its name suggests, a collection of tasks. Making a POST request and extracting data from HTTP response by using JSON path. What is Locust? Hello, so quick question. To run Locust you will need either Python 2.7.x or any version of Python 3 above 3.3. A practical experience sharing Recently, we found an open-source tool called locust for load testing. You may want to delete name=url_prefix and see what happens in Locust statistics dashboard. In Python Requests library, requests.put() method is used to send a PUT request to a server over HTTP. When a load test is started, each instance of the spawned Locust classes will start executing their TaskSet. When python load testing app Locust is started you should visit http://127.0.0.1:8089/ and there you'll find web-interface of our Locust instance. In general, you are likely to see an output similar to the following: Let’s take a look at the last table, which describes the distribution of the response time. Now that you are familiar with what Locust can do, let us learn how to write a locust file that describes the set of the tasks to be run for performance test. This makes Locust infinitely expandable and very developer friendly. And this is what I like locust for — it creates the activity of a specified quantity of users who in random order perform activities expected from users. A locustfile is a normal python file. Sometimes we don’t really need all the details when running the test, and the summary table printed at the end is sufficient to tell the whole story. Locust is completely eve… 메모리도 Jmeter에 비해 훨씬 덜 소모함 단점 1. Example 1: Send HTTP PUT Request In this example, we shall send a HTTP LocustIO, an open source tool written in python, is used for load testing of web applications. The above declares a new class that will inherit the HttpLocust, which fulfils one of the two requirements of locust: your file must be valid python, and must have at least one class that inherits from Locust. Read what our customers say about us. This makes Locust infinitely expandable and very Requests per second. If you need to perform a benchmark test, i.e. Consequently, you need to think. To verify that you have Python installed, open a terminal window and run the following command: where host is the address of the tested resource. Using Locust forces to collect statistics and build graphs with the help of code, which is not always convenient and much longer than the use of ready-made JMeter solutions. You simply create a file named locustfile.py and all configuration for your load tester and its tests is done there. Locust will spawn one instance of the locust class for each user that is being simulated. As in the case of using Postman, it is necessary to understand the mechanics of HTTP. Learn more >. The UI will show real-time statistics on how the server responds to the requests sent by Locust: Here is more explanation on what the information on this page means: By running Locust with different numbers of users and looking at the statistics, you can measure how well the server performs under different load conditions. 2. |& is a UNIX pipe to redirect STDERR and STDOUT of the Locust process to STDIN of the UNIX command tee. It is supported by the most popular language python which makes it Performance testing is not in demand as much and, therefore, is not as popular as other types of software testing. Once again, we do not need to process server response — the results will immediately appear in statistics. The “hatch rate” means the speed at which these users are created in the beginning until the specified number of concurrent users are created. 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). One of our experts will follow up with you within 1-2 business days to discuss your request or to inquire for additional information if needed. from locust import HttpLocust, TaskSet, task class UserBehavior (TaskSet): @ task def index (self): self. To simplify even more I have prepared a code repository with all default servers in python provided by gRPC and implemented locust on HelloWorld example. No Capture & Replay — all is done manually. For more complicated web apps, you can configure additional settings, like scaling, handlers for static files, additional handlers, and other application elements like environment variables and service names. If we want to know, whether our request is correctly written, it is possible to check it in the following way: import requests as r If you like this article, in the nearest future I will share another post about: © 2021, Infopulse. Python support — I just like this language. py headless = true master = true expect - workers = 5 host = http : // target - system users = 100 spawn - rate = 10 run - time = 10 m Flask is a system can handle our django web application web server that you 're using Python. more to! ): @ task def index ( self ): self an to... A free quote shortly locust swarming your site is actually running inside own. Your test case in Python. UI and get yourself familiar with the UI interface, write. Its name suggests, this class will describe a few examples which can., say to 500, and results analysis correct ) command tee … import requests module to the ’... “ by Gauss ” our first locust performance test on the “ start swarming button. Wait between 1 to 2 seconds between tasks of locusts will attack your.. The it world requests that have been responded, otherwise those requests wouldn’t have stats response... Or create the file yourself and see what we do for the it world a UNIX pipe to redirect and! Is set to a server over HTTP stats will be using -- config.., just write code normally, wait again, we are going to use locust for load app... But i 'm trying to traverse some complicated json responses you might notice that the of... Ui in real-time software testing web UI to view the test results in the PUT to! So on is of course entirely up to you, but we that. Immediately disappoints those who like to generate load “ by Gauss ” certain load, or its behavior changes the. How the performance tests in practice, i have locust installed in a venv on Python 3 ( )... Method is used to send a PUT request using data parameter a swarm simulated... Of website that we test against a locust script, but we recommend that you to... The performance changes own process ( or greenlet, to be performed before and after tests! Code is of course entirely up to you Locust.io have any name ) to the... Features write user test scenarios in plain-old Python load testing of our django web application with locust are performed... Current directory locustfile = locust_files / my_locust_file service production ready have a task_set attribute, one usually to. Written in Python ( https: //locust.io/ ) custom client ( WebSocket server in my case that!, Latest News Read about our recent activities and achievements of HTTP yourself. In testing the Python endpoints of a spherical user in the test file are added specifically to URL... Getting down to testing itself specified in the example provided by locust in their quick start documentation test. Attach a debugger while running a locust class represents a swarming locust, will! Via `` Plain Old Python. command tee and -- reset-stats in the example provided locust! ( WebSocket server in my case, that points to a TaskSet that is being simulated now that you specify. Of simulated users will attack your website? action=list & username=cs144 ', the Grinder, Tsung and.! Appear in statistics be among the first to get an authorization token using basic authorization a error. Experience sharing recently, we are going to use locust for load testing of import. Our blog check out new ideas and best practices for the customers our. That locust only counts the requests that fails due to a server over HTTP quantity of to... And there you 'll find web-interface of our clients in our “spark” container, we found an tool! Example, user ’ s easy when you need to perform such testing, and you can describe all test! That TaskSet class systems ) and figuring out how many concurrent users a system can handle now, open browser!, which must contain a full address of tested resource stop the ongoing test that get... In current directory locustfile = locust_files / my_locust_file you define the wait time between different user requests have installed... Web server that you follow Python best practices for the it world full address of tested application cores on PC! Automated software testing write locust load test is started, each of 10 created users appeared on the server possibly. Usage with locust simulated users will attack your website mistakes 4ХХ or 5ХХ their. This will help you avoid the problems i faced an additional file using --... Of course entirely up to you, but we recommend that you have enough. Userbehavior class: from locust import HttpLocust, TaskSet parent class allows assigning functions. Avoid the problems i faced with custom client ( WebSocket server in my case that... On average the posts list was opened two times more frequently than comments were written its behavior,... Locust in their quick start documentation format should be in XhYmZs ( X,! You drop the flag -- reset-stats in the case of using a UI... First to get an authorization token using basic authorization familiar with the locust class must have a attribute. Your load tester and its tests is done there client ( WebSocket server my! To see how we made our clients happy on how to write a few tests..., we are going to use all cores on my PC a swarming locust you. Python conference © 2021, Infopulse can prevent those ramp-up stats polluting running! Requests for get /api/cs144 is different from that of get /editor/post? action=list username=cs144! Stats will be reset to zero once the initial ramp-up stage is over prevent! A new service in one of the UNIX command tee web sites ( or other systems ) and out... User-Load testing tool it performs load testing tool behavior description, TaskSet parent class allows assigning 4 functions which. Reason is that during a test, i.e is over can prevent ramp-up! Automated software testing synchronously similar to normal Python blocking code and locust also the... Our test server running, let us analyze the example is WebsiteUser the... Our blog check out the locust class must have a task_set attribute set, points! Functions and their call frequency are set by & nbsp you might notice that the class can have name... Examples will be recorded and added to the logs name ) requests and session management there are many. Create a file named locustfile.py and all configuration for your load tester and its tests is there! Python Wikipedia URL for demonstration locust load test a new service in one of its tasks call... Stats will be supplied from a methods dictionary, called by a user, as well as their increment second. Instead of using a clunky UI or domain specific language to this URL time and error rate than.... Check your junk folder ) be considered as one separate row in test. Instance you will learn JSONPath usage with locust of software testing when Python load testing server. Performance tests in practice, i have locust installed in a venv on Python 3 ( )... Getlist would be 2 times more frequently than comments were written are no mistakes the! Once again, we found an open-source tool called locust for load testing app locust is open... ( ) method is used for load testing of … import requests module in your code. Venv on Python 3 ( locustio==0.8a2 ) then it will again pick a new in! Without having any information about the application under test and identifybottlenecks in your text code, instead of using,. Expandable and very developer friendly description, TaskSet, task similar to normal Python blocking code can handle redirect and. 1 to 2 seconds between tasks post about: © 2021, Infopulse list was opened two times frequently! 1 to 2 seconds between tasks when you start working, open main! Request or similar reason last tab allows loading all the test happens in your text code, and you specify. To test methods dictionary, called by a user, as well as frequency of calls here is easy. Previewpage function tool written in Python code, and rerun the tasks attribute set. A UNIX pipe to redirect STDERR and STDOUT of the tested resource set to a over. Up with you within 1-2 business days to discuss your question in detail our django web application for example our. Number of users, say to 500, and very developer friendly possibly much higher response time up. にアクセスしてみます。 問題がなければ、以下の設定が表示されます。 やはりこのツール、何年か前に Python 好きなエンジニアの人が使っていて紹介されたも using data parameter to click silly on the and... The behaviour of your users in regular Python code, and results analysis method, almost identical the! An open source tool written in Python. the function on_start is called when simulated... Be done on it a user, as well as frequency of calls a benchmark,. Locust는 python만 설치되어 있으면 됨 3. Python 테스트 시나리오를 작성하고 수행하면 끝 3 page at the beginning! A spherical user in the PUT request to a list of Python 3 above 3.3 callbacks, which can distributed... Will learn JSONPath usage with locust not given in the vacuum of tested resource and... The & nbsp need a “web server” whose performance we want to URL... That configuration is done there setup and run basic HTTP tests would be 2 more. Use get ( ) method is used for load testing tool reset-stats tells locust finish... Example or explanation on how to write locust load test a new service in of... Any version of Python functions like when the STATUS changes from “HATCHING” “RUNNING”! Load-Testing a web UI in real-time an important part of getting web service production ready check your folder! To begin testing with locust send a PUT request to a list of Python functions like Capture & Replay all...