Open Source Go Load Testing Tools

The best developer experience for load testing. Open source and SaaS for engineering teams. Test early and continuously—break the QA silo in performance testing. Backend and frontend engineers prevent regressions when running performance tests. Test scalability to improve your reliability targets. Test SLOs and avoid SLA breaches. Shift left and collaborate with developers for effective and continuous testing. Use the same script for local, distributed, and cloud tests. Migrate from local tests to the cloud using the same script for both environments. Verify that applications can handle the expected traffic. Adapt your testing: stress tests, peak tests, soak tests, etc. Mix browser and API testing—interact with real browsers and collect frontend metrics to get a holistic user view. Simulate real-world traffic in your chaos experiments. Inject system failures in your k6 tests.

Fortio (Φορτίο) started as, and is, Istio’s load testing tool and later (2018) graduated to be its own open-source project. Fortio runs at a specified query per second (qps) and records an histogram of execution time and calculates percentiles (e.g. p99 ie the response time such as 99% of the requests take less than that number (in seconds, SI unit)). It can run for a set duration, for a fixed number of calls, or until interrupted (at a constant target QPS, or max speed/load per connection/thread). Fortio is a fast, small (4Mb docker image, minimal dependencies), reusable, embeddable go library as well as a command line tool and server process, the server includes a simple web UI and REST API to trigger run and see graphical representation of the results (both a single latency graph and a multiple results comparative min, max, avg, qps and percentiles graphs).

Vegeta is a versatile HTTP load testing tool built out of a need to drill HTTP services with a constant request rate. It can be used both as a command line utility and a library. You can install Vegeta using the Homebrew package manager on Mac OS X. Both the library and the CLI are versioned with SemVer v2.0.0. After v8.0.0, the two components are versioned separately to better isolate breaking changes to each. CLI releases are tagged with cli/vMAJOR.MINOR.PATCH and published on the Github releases page. As for the library, new versions are tagged with both lib/vMAJOR.MINOR.PATCH and vMAJOR.MINOR.PATCH. The latter tag is required for compatibility with go mod. The JSON format makes integration with programs that produce targets dynamically easier. Each target is one JSON object in its own line. The method and url fields are required. If present, the body field must be base64 encoded. The generated JSON Schema defines the format in detail.

Generate HTTP load and plot the results in real-time. A load testing tool capable of performing real-time analysis, inspired by vegeta and jplot. ali comes with an embedded terminal-based UI where you can plot the metrics in real-time, so lets you perform real-time analysis on the terminal. Press l (or h) to switch the displayed chart. On all charts, you can click and drag to select a region to zoom into.

vLoad tests should be done regularly to avoid being caught unprepared. Find out the maximum service capacity of your web system. Start the test either instantly or for a future date. Define your periodic load tests. Without load tests, businesses understand the load capacity of their systems when they become inaccessible during campaign times such as Black Friday or Cyber Monday. Determine the origins of requests and the test duration with our easy-to-use web interfaces. Review past load tests and general performance from our reports and charts. Adjust the origin of the requests from 100+ locations. Existing solutions are costly and limited. So we’ve developed a brand-new load generator. Customize your tests with scenarios on UI. Without a line of code! Insightful reports and charts to improve your service capability.

Increase confidence in code deployments, configuration changes and infrastructure changes with GoReplay! GoReplay is an innovative open source tool that captures and replays live HTTP traffic, using it to continuously test your system with real data. Now you don’t have to put up with risks that come with putting a third-party component in the critical path. With GoReplay you can analyze and record your application traffic without affecting it whatsoever. Use it for shadowing, load testing, monitoring and detailed analysis. You can trust GoReplay to accurately emulate production environments so you can make changes and deploy with confidence.