Microsoft Azure Web Run Tests
D2a v4 - Jul 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: Microsoft Azure
Plan: D2a v4
Datacenter: East US
Number of CPU cores: 2
CPU type: AMD EPYC 7452 32-Core Processor

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 49ms 115ms 97% 0.00% 304 0 5
5 47ms 100ms 86% 0.00% 3004 0 5
10 61ms 125ms 67% 0.00% 6005 0 10
15 59ms 120ms 52% 0.00% 4504 0 5
25 63ms 140ms 16% 0.00% 7510 0 5
30 66ms 140ms 0% 0.00% 8637 363 5
35 65ms 140ms 0% 0.00% 8751 1749 5

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