Hetzner Web Run Tests
CCX21 - Apr 02 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: CCX21
Datacenter: Nuremberg, Germany
Number of CPU cores: 4
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 89ms 800ms 97% 0.00% 304 0 5
5 72ms 130ms 88% 0.00% 3004 0 5
10 76ms 145ms 77% 0.00% 6005 0 10
15 74ms 150ms 68% 0.00% 4504 0 5
30 84ms 175ms 30% 0.00% 9013 0 5
40 82ms 165ms 14% 0.00% 12018 0 5
50 83ms 165ms 1% 0.00% 13752 1248 5

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