How to run Locust until the webapp breaks.

Here's the flask app that we're running;

# flaskapp.py
from flask import Flask, jsonify
import time

app = Flask(__name__)


@app.route('/hello/')
def hello_json():
    return jsonify({"message": "hello world again"})


@app.route('/sleep/')
def hello_sleep():
    time.sleep(0.1)
    return jsonify({"message": "slept"})

Here's the command to run the flask app;

export FLASK_APP=flaskapp.py; flask run --port 8000

Here's the user definition for locust;

import random
from locust import HttpUser, between, task, tag

class WebsiteUser(HttpUser):
    wait_time = between(1, 1.5)

    @task
    def attempt(self):
        self.client.get("/hello/")

    @task
    def sleep(self):
        self.client.get("/sleep/")

As a final reminder: think hard about what you would like to benchmark. Otherwise you may risk that you're measuring something that is not that useful for your app.