bfree 0.1.21

bfree - memory stats for humans
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

use bfree::core::memory_stats::MemoryStats;

fn assert_close(actual: f64, expected: f64, epsilon: f64) {
    let diff = (actual - expected).abs();
    assert!(
        diff <= epsilon,
        "expected {expected}, got {actual}, diff {diff} > {epsilon}"
    );
}

#[test]
fn computes_memory_and_swap_metrics() {
    let stats = MemoryStats {
        mem_total: 1_000,
        mem_available: 400,
        mem_cached: 100,
        mem_sreclaimable: 50,
        mem_shmem: 20,
        swap_total: 800,
        swap_free: 300,
    };

    assert_eq!(stats.mem_used(), 600);
    assert_eq!(stats.mem_cache_effective(), 130);
    assert_eq!(stats.swap_used(), 500);

    assert_close(stats.mem_used_percent(), 60.0, 1e-10);
    assert_close(stats.mem_cache_percent(), 13.0, 1e-10);
    assert_close(stats.mem_available_percent(), 40.0, 1e-10);
    assert_close(stats.swap_used_percent(), 62.5, 1e-10);
}

#[test]
fn clamps_subtraction_underflow_to_zero() {
    let stats = MemoryStats {
        mem_total: 1_000,
        mem_available: 1_500,
        mem_cached: 20,
        mem_sreclaimable: 10,
        mem_shmem: 50,
        swap_total: 100,
        swap_free: 200,
    };

    assert_eq!(stats.mem_used(), 0);
    assert_eq!(stats.mem_cache_effective(), 0);
    assert_eq!(stats.swap_used(), 0);
    assert_close(stats.mem_used_percent(), 0.0, 1e-10);
    assert_close(stats.mem_cache_percent(), 0.0, 1e-10);
    assert_close(stats.swap_used_percent(), 0.0, 1e-10);
}

#[test]
fn returns_zero_percent_when_totals_are_zero() {
    let stats = MemoryStats {
        mem_total: 0,
        mem_available: 0,
        mem_cached: 0,
        mem_sreclaimable: 0,
        mem_shmem: 0,
        swap_total: 0,
        swap_free: 0,
    };

    assert_close(stats.mem_used_percent(), 0.0, 1e-10);
    assert_close(stats.mem_cache_percent(), 0.0, 1e-10);
    assert_close(stats.mem_available_percent(), 0.0, 1e-10);
    assert_close(stats.swap_used_percent(), 0.0, 1e-10);
}