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Wrk is a modern HTTP benchmarking tool capable of generating significant load when running on a single multi-core CPU. It combines a multithreaded design with scalable event notification systems such as epoll and kqueue.

✍ Basic Usage

wrk -t12 -c400 -d30s http://site.test

This runs a benchmark for 30 seconds, using 12 threads, and keeping 400 HTTP connections open.

Output:

Running 30s test @ http://site.test
  12 threads and 400 connections
  Thread Stats   Avg      Stdev     Max   +/- Stdev
    Latency   635.91us    0.89ms  12.92ms   93.69%
    Req/Sec    56.20k     8.07k   62.00k    86.54%
  22464657 requests in 30.00s, 17.76GB read
Requests/sec: 748868.53
Transfer/sec:    606.33MB

🔧 Command Line Options

-c, --connections: total number of HTTP connections to keep open with
                   each thread handling N = connections/threads

-d, --duration:    duration of the test, e.g. 2s, 2m, 2h

-t, --threads:     total number of threads to use

-s, --script:      LuaJIT script, see SCRIPTING

-H, --header:      HTTP header to add to request, e.g. "User-Agent: wrk"

    --latency:     print detailed latency statistics

    --timeout:     record a timeout if a response is not received within
                   this amount of time.

If you are needing to do some benchmark testing check out wrk and it can even be installed via homebrew.