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BENCHMARKING.md

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Benchmarking

This guide contains some information on how to benchmark erldns locally.

Install dnsperf

The recommended benchmarking tool is dnsperf. You can compile it from source or, if on macOS, install it with:

brew install dnsperf

Create a Queries File

dnsperf requires DNS queries to run in order to perform benchmarks. You can use whatever queries to test different aspects of erldns, such as how it behaves when mostly responding to unknown records or when you execute the same query many times in a row.

A good start is a small file with some example.com-related queries, as example.com domains are the default in the sample config file.

Put this in queries.txt:

thumbs2.ebaystatic.com. AAAA
sip.hotmail.com. A
google.com. A
cache.defamer.com. A
example.com. A
www.example.com. CNAME

Start the Server

Important

Start erldns as a release to make sure it gets compiled with production-like settings, rather than dev settings (as in rebar3 shell).

First, create a release:

rebar3 release

Then, start the release in the foreground:

./_build/default/rel/erldns/bin/erldns foreground

Run the Benchmark

Now you're ready to run benchmarks. For example:

dnsperf -p 8053 -d ./queries.txt -T 4 -c 20 -n 10000

See dnsperf -h for an explanation of the flags.

Latest Benchmark

The latest benchmark was run on 2024/10/06 by @whatyouhide, on an 2021 Apple MacBook Pro, 14-inch, M1 Pro CPU, 16 GB of memory.

In these conditions, erldns can serve around 58k queries per second. The details of the benchmark are below.

Input queries file 
thumbs2.ebaystatic.com. AAAA
sip.hotmail.com. A
google.com. A
cache.defamer.com. A
example.com. A
www.example.com. CNAME
Command 
dnsperf -p 8053 -d ./queries.txt -T 4 -c 20 -n 10000
Results 
DNS Performance Testing Tool
Version 2.14.0

[Status] Command line: dnsperf -p 8053 -d ./queries.txt -T 4 -c 20 -n 10000
[Status] Sending queries (to 127.0.0.1:8053)
[Status] Started at: Sun Oct  6 15:05:52 2024
[Status] Stopping after 10000 runs through file
[Status] Testing complete (end of file)

Statistics:

  Queries sent:         60000
  Queries completed:    60000 (100.00%)
  Queries lost:         0 (0.00%)

  Response codes:       NOERROR 20000 (33.33%), REFUSED 40000 (66.67%)
  Average packet size:  request 33, response 38
  Run time (s):         1.029389
  Queries per second:   58287.003261

  Average Latency (s):  0.001682 (min 0.000085, max 0.006491)
  Latency StdDev (s):   0.001155