LoadTesting Tools Bench

Benchmarks comparing popular load testing tools against a common ASP.NET Core target API.

Prerequisites

• .NET 10 SDK
• k6 v2.0.0
• Python 3 + Locust 2.44.1 — pip install locust==2.44.1
• Java 25 + Maven (for Gatling)

Project Structure

src/
  TargetApi/          # ASP.NET Core minimal API under test
tests/
  NBomber/            # NBomber load test (.NET)
  k6/                 # k6 load test (JavaScript)
  Locust/             # Locust load test (Python)
  Gatling/            # Gatling load test (Java/Maven)

Target API

Runs on http://localhost:5000 and exposes three endpoints:

Method	Path	Description
POST	/api/users	Store a batch of users
GET	/api/users	Retrieve stored users
GET	/api/stats	Total invocation count and user count

How to Run the Benchmarks

Prepare Environment

Increase the ephemeral port range on Windows (run as Admin):

netsh int ipv4 set dynamicport tcp start=1024 num=64511

Start the Target API

dotnet run --project src/TargetApi/TargetApi.csproj -c Release

Run a Load Test

NBomber

dotnet run --project tests/NBomber/LoadTests.NBomber.csproj -c Release

k6

k6 run tests/k6/script.js

Locust

locust -f tests/Locust/locustfile.py --headless --host http://localhost:5000

Gatling

cd tests/Gatling
mvn gatling:test