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
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
|
//! This module is responsible for collecting metrics profiling information for the current build
//! and dumping it to disk as JSON, to aid investigations on build and CI performance.
//!
//! As this module requires additional dependencies not present during local builds, it's cfg'd
//! away whenever the `build.metrics` config option is not set to `true`.
use crate::builder::Step;
use crate::util::t;
use crate::Build;
use serde_derive::{Deserialize, Serialize};
use std::cell::RefCell;
use std::fs::File;
use std::io::BufWriter;
use std::time::{Duration, Instant};
use sysinfo::{CpuExt, System, SystemExt};
pub(crate) struct BuildMetrics {
state: RefCell<MetricsState>,
}
impl BuildMetrics {
pub(crate) fn init() -> Self {
let state = RefCell::new(MetricsState {
finished_steps: Vec::new(),
running_steps: Vec::new(),
system_info: System::new(),
timer_start: None,
invocation_timer_start: Instant::now(),
});
BuildMetrics { state }
}
pub(crate) fn enter_step<S: Step>(&self, step: &S) {
let mut state = self.state.borrow_mut();
// Consider all the stats gathered so far as the parent's.
if !state.running_steps.is_empty() {
self.collect_stats(&mut *state);
}
state.system_info.refresh_cpu();
state.timer_start = Some(Instant::now());
state.running_steps.push(StepMetrics {
type_: std::any::type_name::<S>().into(),
debug_repr: format!("{step:?}"),
cpu_usage_time_sec: 0.0,
duration_excluding_children_sec: Duration::ZERO,
children: Vec::new(),
});
}
pub(crate) fn exit_step(&self) {
let mut state = self.state.borrow_mut();
self.collect_stats(&mut *state);
let step = state.running_steps.pop().unwrap();
if state.running_steps.is_empty() {
state.finished_steps.push(step);
state.timer_start = None;
} else {
state.running_steps.last_mut().unwrap().children.push(step);
// Start collecting again for the parent step.
state.system_info.refresh_cpu();
state.timer_start = Some(Instant::now());
}
}
fn collect_stats(&self, state: &mut MetricsState) {
let step = state.running_steps.last_mut().unwrap();
let elapsed = state.timer_start.unwrap().elapsed();
step.duration_excluding_children_sec += elapsed;
state.system_info.refresh_cpu();
let cpu = state.system_info.cpus().iter().map(|p| p.cpu_usage()).sum::<f32>();
step.cpu_usage_time_sec += cpu as f64 / 100.0 * elapsed.as_secs_f64();
}
pub(crate) fn persist(&self, build: &Build) {
let mut state = self.state.borrow_mut();
assert!(state.running_steps.is_empty(), "steps are still executing");
let dest = build.out.join("metrics.json");
let mut system = System::new();
system.refresh_cpu();
system.refresh_memory();
let system_stats = JsonInvocationSystemStats {
cpu_threads_count: system.cpus().len(),
cpu_model: system.cpus()[0].brand().into(),
memory_total_bytes: system.total_memory(),
};
let steps = std::mem::take(&mut state.finished_steps);
// Some of our CI builds consist of multiple independent CI invocations. Ensure all the
// previous invocations are still present in the resulting file.
let mut invocations = match std::fs::read(&dest) {
Ok(contents) => t!(serde_json::from_slice::<JsonRoot>(&contents)).invocations,
Err(err) => {
if err.kind() != std::io::ErrorKind::NotFound {
panic!("failed to open existing metrics file at {}: {err}", dest.display());
}
Vec::new()
}
};
invocations.push(JsonInvocation {
duration_including_children_sec: state.invocation_timer_start.elapsed().as_secs_f64(),
children: steps.into_iter().map(|step| self.prepare_json_step(step)).collect(),
});
let json = JsonRoot { system_stats, invocations };
t!(std::fs::create_dir_all(dest.parent().unwrap()));
let mut file = BufWriter::new(t!(File::create(&dest)));
t!(serde_json::to_writer(&mut file, &json));
}
fn prepare_json_step(&self, step: StepMetrics) -> JsonNode {
JsonNode::RustbuildStep {
type_: step.type_,
debug_repr: step.debug_repr,
duration_excluding_children_sec: step.duration_excluding_children_sec.as_secs_f64(),
system_stats: JsonStepSystemStats {
cpu_utilization_percent: step.cpu_usage_time_sec * 100.0
/ step.duration_excluding_children_sec.as_secs_f64(),
},
children: step
.children
.into_iter()
.map(|child| self.prepare_json_step(child))
.collect(),
}
}
}
struct MetricsState {
finished_steps: Vec<StepMetrics>,
running_steps: Vec<StepMetrics>,
system_info: System,
timer_start: Option<Instant>,
invocation_timer_start: Instant,
}
struct StepMetrics {
type_: String,
debug_repr: String,
cpu_usage_time_sec: f64,
duration_excluding_children_sec: Duration,
children: Vec<StepMetrics>,
}
#[derive(Serialize, Deserialize)]
#[serde(rename_all = "snake_case")]
struct JsonRoot {
system_stats: JsonInvocationSystemStats,
invocations: Vec<JsonInvocation>,
}
#[derive(Serialize, Deserialize)]
#[serde(rename_all = "snake_case")]
struct JsonInvocation {
duration_including_children_sec: f64,
children: Vec<JsonNode>,
}
#[derive(Serialize, Deserialize)]
#[serde(tag = "kind", rename_all = "snake_case")]
enum JsonNode {
RustbuildStep {
#[serde(rename = "type")]
type_: String,
debug_repr: String,
duration_excluding_children_sec: f64,
system_stats: JsonStepSystemStats,
children: Vec<JsonNode>,
},
}
#[derive(Serialize, Deserialize)]
#[serde(rename_all = "snake_case")]
struct JsonInvocationSystemStats {
cpu_threads_count: usize,
cpu_model: String,
memory_total_bytes: u64,
}
#[derive(Serialize, Deserialize)]
#[serde(rename_all = "snake_case")]
struct JsonStepSystemStats {
cpu_utilization_percent: f64,
}
|
