benchmark code for rustscan

[bee-san]

No description provided.

[PsypherPunk]

LGTM. This is the output (with a lot of Open… lines removed):

Running benches/benchmark_portscan.rs (target/release/deps/benchmark_portscan-b123ee4f74837671)
Benchmarking portscan tcp: Warming up for 3.0000 s
Open 127.0.0.1:631
…
Open 127.0.0.1:631
Benchmarking portscan tcp: Collecting 100 samples in estimated 6.3717 s (200 iterations)
Open 127.0.0.1:631
…
Open 127.0.0.1:631
portscan tcp            time:   [32.337 ms 32.707 ms 33.164 ms]
                   change: [-3.0799% -0.4265% +2.3654%] (p = 0.75 > 0.05)
                   No change in performance detected.
Found 11 outliers among 100 measurements (11.00%)
2 (2.00%) low mild
4 (4.00%) high mild
5 (5.00%) high severe

portscan udp/portscan udp
                   time:   [144.59 ms 146.87 ms 149.07 ms]
                   change: [-4.5106% -2.3084% -0.0888%] (p = 0.04 < 0.05)
                   Change within noise threshold.

[bee-san]

portscan tcp            time:   [37.942 ms 38.609 ms 39.280 ms]
                        change: [+0.7704% +3.1799% +5.6135%] (p = 0.01 < 0.05)
                        Change within noise threshold.

portscan udp/portscan udp
                        time:   [62.450 ms 63.154 ms 63.873 ms]
                        change: [-0.7117% +1.1712% +3.0481%] (p = 0.22 > 0.05)
                        No change in performance detected.
Found 1 outliers among 100 measurements (1.00%)
  1 (1.00%) high mild

parse address           time:   [17.086 ns 17.465 ns 17.843 ns]
                        change: [-3.6254% +0.6389% +4.8144%] (p = 0.77 > 0.05)
                        No change in performance detected.
Found 1 outliers among 100 measurements (1.00%)
  1 (1.00%) high mild

port strategy           time:   [614.41 ps 621.38 ps 628.64 ps]
                        change: [-2.1726% -0.8710% +0.5917%] (p = 0.21 > 0.05)
                        No change in performance detected.
Found 9 outliers among 100 measurements (9.00%)
  7 (7.00%) high mild
  2 (2.00%) high severe