How to Use http_load for Fast Web Server Performance Testing
This guide explains how to install and use the lightweight Linux tool http_load to benchmark web server performance, covering preparation of URL lists, key command‑line parameters, example test runs, and interpretation of the detailed output statistics.
Overview
http_load is a lightweight Linux tool for measuring web server performance using parallel requests.
Preparation
Create a file (e.g., url.txt) listing target URLs, one per line.
Common Parameters
-p: number of parallel processes -f: total number of requests -r: request rate per second -s: total test duration
Running a Test
Example command to perform 1,000 requests with 10 concurrent processes: http_load -p 10 -f 1000 url.txt After execution, http_load outputs several lines of statistics.
Result Interpretation
First line shows total fetches, max parallel, total bytes transferred, and total time. Subsequent lines provide mean bytes per connection, fetches per second, bytes per second, connection latency statistics, and first‑response times. The “fetches/sec” value indicates the server’s throughput.
Additional Tests
You can also test a fixed rate over a set duration, e.g.: http_load -r 5 -s 300 urls.txt This runs at 5 requests per second for 300 seconds.
Installation
Installation is straightforward.
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