many_cpus 2.4.0

Efficiently schedule work and inspect the hardware environment on many-processor systems
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
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129

use std::fmt::Display;

use crate::pal::AbstractProcessor;
use crate::pal::windows::{ProcessorGroupIndex, ProcessorIndexInGroup};
use crate::{EfficiencyClass, MemoryRegionId, ProcessorId};

#[derive(Clone, Copy, Debug, Eq, Hash, PartialEq)]
pub(crate) struct ProcessorImpl {
    pub(crate) group_index: ProcessorGroupIndex,
    pub(crate) index_in_group: ProcessorIndexInGroup,

    // Cumulative index when counting across all groups.
    pub(crate) id: ProcessorId,

    pub(crate) memory_region_id: MemoryRegionId,

    pub(crate) efficiency_class: EfficiencyClass,
}

impl ProcessorImpl {
    pub(crate) fn new(
        group_index: ProcessorGroupIndex,
        index_in_group: ProcessorIndexInGroup,
        id: ProcessorId,
        memory_region_id: MemoryRegionId,
        efficiency_class: EfficiencyClass,
    ) -> Self {
        Self {
            group_index,
            index_in_group,
            id,
            memory_region_id,
            efficiency_class,
        }
    }
}

impl Display for ProcessorImpl {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        write!(
            f,
            "processor {} [{}.{}]",
            self.id, self.group_index, self.index_in_group
        )
    }
}

impl AbstractProcessor for ProcessorImpl {
    fn id(&self) -> ProcessorId {
        self.id
    }

    fn memory_region_id(&self) -> MemoryRegionId {
        self.memory_region_id
    }

    fn efficiency_class(&self) -> EfficiencyClass {
        self.efficiency_class
    }
}

impl AsRef<Self> for ProcessorImpl {
    fn as_ref(&self) -> &Self {
        self
    }
}

impl PartialOrd for ProcessorImpl {
    fn partial_cmp(&self, other: &Self) -> Option<std::cmp::Ordering> {
        Some(self.cmp(other))
    }
}

impl Ord for ProcessorImpl {
    fn cmp(&self, other: &Self) -> std::cmp::Ordering {
        self.id.cmp(&other.id)
    }
}

#[cfg(test)]
#[cfg_attr(coverage_nightly, coverage(off))]
mod tests {
    use super::*;

    #[test]
    fn smoke_test() {
        let processor = ProcessorImpl::new(0, 1, 2, 3, EfficiencyClass::Performance);

        assert_eq!(processor.id(), 2);
        assert_eq!(processor.memory_region_id(), 3);
        assert_eq!(processor.efficiency_class(), EfficiencyClass::Performance);

        let processor2 = ProcessorImpl::new(0, 1, 2, 3, EfficiencyClass::Performance);
        assert_eq!(processor, processor2);

        let processor3 = ProcessorImpl::new(0, 1, 4, 3, EfficiencyClass::Performance);
        assert_ne!(processor, processor3);
        assert!(processor < processor3);
        assert!(processor3 > processor);
    }

    #[test]
    fn display_shows_processor_id_and_group_info() {
        // group_index=1, index_in_group=3, id=7
        let processor = ProcessorImpl::new(1, 3, 7, 0, EfficiencyClass::Performance);

        let display_output = processor.to_string();

        assert!(
            display_output.contains("processor 7"),
            "display should contain processor ID: {display_output}"
        );
        assert!(
            display_output.contains("[1.3]"),
            "display should contain group.index format: {display_output}"
        );
    }

    #[test]
    fn as_ref_returns_self() {
        let processor = ProcessorImpl::new(0, 2, 5, 1, EfficiencyClass::Efficiency);

        let processor_ref: &ProcessorImpl = processor.as_ref();

        assert_eq!(processor_ref.id, processor.id);
        assert_eq!(processor_ref.group_index, processor.group_index);
        assert_eq!(processor_ref.index_in_group, processor.index_in_group);
    }
}