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nsbench: a tool I cobbled together to load test/benchmark DNS servers
Also a great way to learn thread-based concurrency in rust!
I don't really guarantee anything about this software. It can generate a lot of load, though! I built it to help me evaluate performance issues with zeronsd.
nsbench will allocate N threads (where N defaults to the number of CPUs) to repeatedly hammer your DNS server for a fixed period of time (default 60 seconds). It will periodically report on a number of things, like latency. Once finished, it will offer a detailed report of the run status.
cargo install --git https://github.com/erikh/nsbench --branch main
Usage:
nsbench <nameserver ip> <host>
There are other flags. Use --help to access them. As of this writing, that looks like this:
Usage: nsbench <nameserver> <host> [-t <time-secs>] [-l <cpus>] [--timeout <timeout>]
Nameserver benchmarking/flooding tool
Options:
-t, --time-secs time in seconds to run the test
-l, --cpus limit the number of CPUs (default off)
--timeout duration to wait (in ns) before considering a request failed
--help display usage information
