Hetzner Web Run Tests
CX31 - Oct 17 2020

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Web Run tests are made of a load test tool and a database intensive Rails web application.

The load test tool sends HTTP requests to the web application at a controlled rate and records HTTP response codes, response latencies and timeouts. The load test tool is multithreaded and runs on the same VPS where the web application runs.

The intent is to measure:

  • the response times (latency) of the web server
  • the amount of CPU used to serve those requests under various load levels
  • what's the maximum load at which 100% requests are served without timing out.

Provider: Hetzner
Plan: CX31
Datacenter: Nuremberg, Germany
Number of CPU cores: 2
CPU type: Intel Xeon Processor (Skylake, IBRS)

Web Runs by request rate


Note: the P99 is the 99th percentile. The P99 latency is the latency of the 1% slowest HTTP requests in the web run.


Rate (reqs/s) Average Latency P99 Latency CPU idle CPU steal Successful requests Timed out requests Duration (minutes)
1 86ms 190ms 94% 0.00% 304 0 5
5 81ms 185ms 76% 0.00% 1504 0 5
10 74ms 175ms 58% 0.00% 6005 0 10
15 72ms 165ms 40% 0.00% 4504 0 5
20 66ms 160ms 28% 0.00% 6009 0 5
25 66ms 160ms 12% 0.00% 7509 0 5
30 62ms 155ms 1% 0.00% 9012 0 5
35 60ms 150ms 0% 0.00% 9399 1101 5

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