HTTPerf
A robust, high-performance HTTP load generator for measuring web server performance with support for HTTP/1.1 and SSL.
What is HTTPerf?
httperf is an HTTP load generator tool designed to measure web server performance by creating various HTTP workloads. It solves the problem of evaluating server robustness and scalability under different traffic conditions, providing detailed metrics to analyze performance bottlenecks.
System administrators, DevOps engineers, and performance analysts who need to stress-test web servers, evaluate scalability, and benchmark HTTP service performance under realistic or extreme loads.
Developers choose httperf for its robustness in generating sustained server overload, support for modern protocols like HTTP/1.1 and SSL, and its extensible design that allows customization beyond standard benchmarks.
Overview
The httperf HTTP load generator
Use Cases
Best For
- Stress testing web servers to determine maximum request handling capacity
- Benchmarking HTTP/1.1 and SSL-enabled server performance
- Measuring server response times under varying connection rates
- Analyzing web server behavior during sustained overload conditions
- Conducting micro- and macro-level performance benchmarks
- Testing persistent connection (HTTP Keep-Alive) performance
Not Ideal For
- Projects requiring HTTP/2, HTTP/3, or WebSocket protocol testing for modern web applications
- Teams wanting a graphical interface, real-time dashboards, or easy script integration without building from source
- Environments where CPU resources are shared and cannot dedicate an entire machine to load generation
- Quick, ad-hoc performance checks needing minimal setup and immediate results
Pros & Cons
Pros
Can sustain server overload to test performance under extreme conditions, as emphasized in its design philosophy for accurate stress testing.
Provides comprehensive statistics like connection rates, response times, and error counts, shown in the example output for in-depth analysis.
Supports HTTP/1.1 and SSL with Keep-Alives, enabling realistic multi-request scenarios and protocol-aware benchmarking.
Designed to be extended with new workload generators, allowing customization beyond standard benchmarks for flexible testing.
Cons
Requires installing automake, libtool, and running multiple manual steps, with tested OSes being older systems like HP-UX and Solaris 8.
Only covers HTTP/1.1 and SSL, missing modern protocols like HTTP/2 or HTTP/3 that are essential for contemporary web server testing.
Uses a deterministic seed for SSL, making encryption weak and unsuitable for security validation, as warned in the README.
Consumes all CPU time and cannot run other tasks on the client machine, requiring dedicated hardware which adds to testing overhead.
Frequently Asked Questions
Related Projects
wrkModern HTTP benchmarking tool
beeswithmachinegunsA utility for arming (creating) many bees (micro EC2 instances) to attack (load test) targets (web applications).
AutoperfRuby driver for httperf - automated load and performance testing
HTTPerf.jsNodeJS port of HTTPerf.rb
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