subms 0.9.1

The sub-millisecond perf harness for Rust. Zero-dependency std-only library that records timed samples per stage, computes percentiles, supports coordinated-omission correction, runs scale sweeps, and emits a stable JSON contract. Byte-equivalent to the Java sibling com.submillisecond:subms.
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98

//! Unit tests for `params`, colocated (included via `#[path]` in params.rs).

use super::*;

fn m<const N: usize>(pairs: [(&str, &str); N]) -> BTreeMap<String, String> {
    pairs
        .iter()
        .map(|(k, v)| (k.to_string(), v.to_string()))
        .collect()
}

#[test]
fn parse_usize_present() {
    assert_eq!(parse_usize(&m([("n", "1234")]), "n", 0), 1234);
}
#[test]
fn parse_usize_missing() {
    assert_eq!(parse_usize(&m([("other", "1")]), "n", 42), 42);
}
#[test]
fn parse_usize_invalid_falls_back() {
    assert_eq!(parse_usize(&m([("n", "abc")]), "n", 42), 42);
}

#[test]
fn parse_u64_present() {
    assert_eq!(parse_u64(&m([("seed", "99")]), "seed", 0), 99);
}
#[test]
fn parse_u64_missing() {
    assert_eq!(parse_u64(&m([]), "seed", 7), 7);
}
#[test]
fn parse_u64_invalid_falls_back() {
    assert_eq!(parse_u64(&m([("seed", "not-a-number")]), "seed", 7), 7);
}

#[test]
fn parse_string_present() {
    assert_eq!(parse_string(&m([("mode", "on")]), "mode", "off"), "on");
}
#[test]
fn parse_string_missing() {
    assert_eq!(parse_string(&m([]), "mode", "off"), "off");
}

#[test]
fn parse_bool_accepts_truthy() {
    for v in ["1", "true", "TRUE", "on", "On", "yes", "Yes"] {
        assert!(parse_bool(&m([("x", v)]), "x", false), "{v} should be true");
    }
}
#[test]
fn parse_bool_accepts_falsy() {
    for v in ["0", "false", "off", "no", "NO"] {
        assert!(
            !parse_bool(&m([("x", v)]), "x", true),
            "{v} should be false"
        );
    }
}
#[test]
fn parse_bool_unknown_falls_back() {
    assert!(parse_bool(&m([("x", "maybe")]), "x", true));
    assert!(!parse_bool(&m([("x", "maybe")]), "x", false));
}
#[test]
fn parse_bool_missing_falls_back() {
    assert!(parse_bool(&m([]), "x", true));
    assert!(!parse_bool(&m([]), "x", false));
}

#[test]
fn bench_params_from_map_uses_defaults_when_missing() {
    let p = SubMsBenchParams::from_map(&m([]));
    let d = SubMsBenchParams::default();
    assert_eq!(p.entries, d.entries);
    assert_eq!(p.warmup, d.warmup);
    assert_eq!(p.seed, d.seed);
}

#[test]
fn bench_params_from_map_reads_overrides() {
    let p =
        SubMsBenchParams::from_map(&m([("entries", "1000"), ("warmup", "100"), ("seed", "42")]));
    assert_eq!(p.entries, 1000);
    assert_eq!(p.warmup, 100);
    assert_eq!(p.seed, 42);
}

#[test]
fn bench_params_from_map_ignores_garbage_values() {
    let p = SubMsBenchParams::from_map(&m([("entries", "abc"), ("warmup", "?"), ("seed", "nope")]));
    let d = SubMsBenchParams::default();
    assert_eq!(p.entries, d.entries);
    assert_eq!(p.warmup, d.warmup);
    assert_eq!(p.seed, d.seed);
}